| r0.1 | label_boi_a2/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| r0.2 | label_boi_a2/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r0.3 | label_boi_a2/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r0.4 | label_boi_a2/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r0.5 | label_boi_a2/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r0.6 | label_boi_a2/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r0.7 | label_boi_a2/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r0.8 | label_boi_a2/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r0.9 | label_boi_a2/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r0.10 | label_boi_a2/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r1.1 | Assets/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| r1.2 | Assets/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r1.3 | Assets/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r1.4 | Assets/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r1.5 | Assets/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r1.6 | Assets/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r1.7 | Assets/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r1.8 | Assets/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r1.9 | Assets/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r1.10 | Assets/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r2.1 | Bonds available for sale and non trade shares/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| r2.2 | Bonds available for sale and non trade shares/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r2.3 | Bonds available for sale and non trade shares/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r2.4 | Bonds available for sale and non trade shares/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r2.5 | Bonds available for sale and non trade shares/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r2.6 | Bonds available for sale and non trade shares/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r2.7 | Bonds available for sale and non trade shares/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r2.8 | Bonds available for sale and non trade shares/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r2.9 | Bonds available for sale and non trade shares/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r2.10 | Bonds available for sale and non trade shares/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 1.1 | Of Israel Government/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | boi_SE:x11 |
| 1.2 | Of Israel Government/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 1.3 | Of Israel Government/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 1.4 | Of Israel Government/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 1.5 | Of Israel Government/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 1.6 | Of Israel Government/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 1.7 | Of Israel Government/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 1.8 | Of Israel Government/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 1.9 | Of Israel Government/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 1.10 | Of Israel Government/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 2.1 | Of foreign governments/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | boi_SE:x11 |
| 2.2 | Of foreign governments/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 2.3 | Of foreign governments/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 2.4 | Of foreign governments/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 2.5 | Of foreign governments/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 2.6 | Of foreign governments/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 2.7 | Of foreign governments/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 2.8 | Of foreign governments/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 2.9 | Of foreign governments/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 2.10 | Of foreign governments/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 3.1 | Of financial institutions in Israel/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | boi_SE:x9 |
| 3.2 | Of financial institutions in Israel/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 3.3 | Of financial institutions in Israel/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 3.4 | Of financial institutions in Israel/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 3.5 | Of financial institutions in Israel/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 3.6 | Of financial institutions in Israel/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 3.7 | Of financial institutions in Israel/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 3.8 | Of financial institutions in Israel/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 3.9 | Of financial institutions in Israel/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 3.10 | Of financial institutions in Israel/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 4.1 | Of foreign financial institutions/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | boi_SE:x9 |
| 4.2 | Of foreign financial institutions/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 4.3 | Of foreign financial institutions/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 4.4 | Of foreign financial institutions/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 4.5 | Of foreign financial institutions/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 4.6 | Of foreign financial institutions/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 4.7 | Of foreign financial institutions/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 4.8 | Of foreign financial institutions/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 4.9 | Of foreign financial institutions/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 4.10 | Of foreign financial institutions/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 5.1 | Asset-backed or mortgage-backed/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| 5.2 | Asset-backed or mortgage-backed/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 5.3 | Asset-backed or mortgage-backed/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 5.4 | Asset-backed or mortgage-backed/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 5.5 | Asset-backed or mortgage-backed/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 5.6 | Asset-backed or mortgage-backed/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 5.7 | Asset-backed or mortgage-backed/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 5.8 | Asset-backed or mortgage-backed/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 5.9 | Asset-backed or mortgage-backed/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 5.10 | Asset-backed or mortgage-backed/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 6.1 | Of others in Israel/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | boi_SE:x69 |
| 6.2 | Of others in Israel/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 6.3 | Of others in Israel/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 6.4 | Of others in Israel/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 6.5 | Of others in Israel/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 6.6 | Of others in Israel/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 6.7 | Of others in Israel/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 6.8 | Of others in Israel/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 6.9 | Of others in Israel/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 6.10 | Of others in Israel/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 7.1 | Of others abroad/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | boi_SE:x69 |
| 7.2 | Of others abroad/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 7.3 | Of others abroad/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 7.4 | Of others abroad/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 7.5 | Of others abroad/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 7.6 | Of others abroad/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 7.7 | Of others abroad/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 7.8 | Of others abroad/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 7.9 | Of others abroad/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 7.10 | Of others abroad/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 8.1 | Shares/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| 8.2 | Shares/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 8.3 | Shares/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 8.4 | Shares/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 8.5 | Shares/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 8.6 | Shares/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 8.7 | Shares/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 8.8 | Shares/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 8.9 | Shares/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 8.10 | Shares/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 9.1 | Other (if breakdown is not material)/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| 9.2 | Other (if breakdown is not material)/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 9.3 | Other (if breakdown is not material)/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 9.4 | Other (if breakdown is not material)/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 9.5 | Other (if breakdown is not material)/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 9.6 | Other (if breakdown is not material)/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 9.7 | Other (if breakdown is not material)/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 9.8 | Other (if breakdown is not material)/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 9.9 | Other (if breakdown is not material)/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 9.10 | Other (if breakdown is not material)/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 10.1 | Total securities available for sale/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| 10.2 | Total securities available for sale/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 10.3 | Total securities available for sale/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 10.4 | Total securities available for sale/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 10.5 | Total securities available for sale/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 10.6 | Total securities available for sale/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 10.7 | Total securities available for sale/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 10.8 | Total securities available for sale/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 10.9 | Total securities available for sale/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | N/A | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 10.10 | Total securities available for sale/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r13.1 | Securities for trading/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| r13.2 | Securities for trading/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r13.3 | Securities for trading/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r13.4 | Securities for trading/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r13.5 | Securities for trading/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r13.6 | Securities for trading/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r13.7 | Securities for trading/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r13.8 | Securities for trading/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r13.9 | Securities for trading/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r13.10 | Securities for trading/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 11.1 | Of Israel Government/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | boi_SE:x11 |
| 11.2 | Of Israel Government/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 11.3 | Of Israel Government/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 11.4 | Of Israel Government/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 11.5 | Of Israel Government/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 11.6 | Of Israel Government/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 11.7 | Of Israel Government/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 11.8 | Of Israel Government/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 11.9 | Of Israel Government/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 11.10 | Of Israel Government/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 12.1 | Of foreign governments/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | boi_SE:x11 |
| 12.2 | Of foreign governments/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 12.3 | Of foreign governments/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 12.4 | Of foreign governments/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 12.5 | Of foreign governments/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 12.6 | Of foreign governments/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 12.7 | Of foreign governments/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 12.8 | Of foreign governments/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 12.9 | Of foreign governments/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 12.10 | Of foreign governments/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x11 |
| 13.1 | Of financial institutions in Israel/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | boi_SE:x9 |
| 13.2 | Of financial institutions in Israel/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 13.3 | Of financial institutions in Israel/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 13.4 | Of financial institutions in Israel/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 13.5 | Of financial institutions in Israel/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 13.6 | Of financial institutions in Israel/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 13.7 | Of financial institutions in Israel/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 13.8 | Of financial institutions in Israel/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 13.9 | Of financial institutions in Israel/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 13.10 | Of financial institutions in Israel/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 14.1 | Of foreign financial institutions/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | boi_SE:x9 |
| 14.2 | Of foreign financial institutions/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 14.3 | Of foreign financial institutions/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 14.4 | Of foreign financial institutions/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 14.5 | Of foreign financial institutions/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 14.6 | Of foreign financial institutions/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 14.7 | Of foreign financial institutions/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 14.8 | Of foreign financial institutions/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 14.9 | Of foreign financial institutions/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 14.10 | Of foreign financial institutions/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x9 |
| 15.1 | Asset-backed or mortgage-backed/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| 15.2 | Asset-backed or mortgage-backed/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 15.3 | Asset-backed or mortgage-backed/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 15.4 | Asset-backed or mortgage-backed/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 15.5 | Asset-backed or mortgage-backed/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 15.6 | Asset-backed or mortgage-backed/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 15.7 | Asset-backed or mortgage-backed/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 15.8 | Asset-backed or mortgage-backed/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 15.9 | Asset-backed or mortgage-backed/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 15.10 | Asset-backed or mortgage-backed/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 16.1 | Of others in Israel/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | boi_SE:x69 |
| 16.2 | Of others in Israel/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 16.3 | Of others in Israel/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 16.4 | Of others in Israel/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 16.5 | Of others in Israel/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 16.6 | Of others in Israel/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 16.7 | Of others in Israel/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 16.8 | Of others in Israel/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 16.9 | Of others in Israel/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 16.10 | Of others in Israel/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 17.1 | Of others abroad/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | boi_SE:x69 |
| 17.2 | Of others abroad/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 17.3 | Of others abroad/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 17.4 | Of others abroad/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 17.5 | Of others abroad/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 17.6 | Of others abroad/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 17.7 | Of others abroad/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 17.8 | Of others abroad/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 17.9 | Of others abroad/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 17.10 | Of others abroad/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | boi_SE:x69 |
| 18.1 | Shares/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| 18.2 | Shares/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 18.3 | Shares/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 18.4 | Shares/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 18.5 | Shares/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 18.6 | Shares/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 18.7 | Shares/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 18.8 | Shares/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 18.9 | Shares/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 18.10 | Shares/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 19.1 | Other (if breakdown is not material)/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| 19.2 | Other (if breakdown is not material)/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 19.3 | Other (if breakdown is not material)/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 19.4 | Other (if breakdown is not material)/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 19.5 | Other (if breakdown is not material)/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 19.6 | Other (if breakdown is not material)/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 19.7 | Other (if breakdown is not material)/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 19.8 | Other (if breakdown is not material)/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 19.9 | Other (if breakdown is not material)/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 19.10 | Other (if breakdown is not material)/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 20.1 | Total securities for trading/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| 20.2 | Total securities for trading/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 20.3 | Total securities for trading/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 20.4 | Total securities for trading/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 20.5 | Total securities for trading/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 20.6 | Total securities for trading/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 20.7 | Total securities for trading/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 20.8 | Total securities for trading/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 20.9 | Total securities for trading/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | N/A | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 20.10 | Total securities for trading/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_MU:x1 | N/A | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r24.1 | Assets in respect of derivative instruments/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| r24.2 | Assets in respect of derivative instruments/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r24.3 | Assets in respect of derivative instruments/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r24.4 | Assets in respect of derivative instruments/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r24.5 | Assets in respect of derivative instruments/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r24.6 | Assets in respect of derivative instruments/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r24.7 | Assets in respect of derivative instruments/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r24.8 | Assets in respect of derivative instruments/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r24.9 | Assets in respect of derivative instruments/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r24.10 | Assets in respect of derivative instruments/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 21.1 | Interest-rate contracts/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | boi_RT:x8 | N/A |
| 21.2 | Interest-rate contracts/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 21.3 | Interest-rate contracts/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 21.4 | Interest-rate contracts/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 21.5 | Interest-rate contracts/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 21.6 | Interest-rate contracts/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 21.7 | Interest-rate contracts/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 21.8 | Interest-rate contracts/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 21.9 | Interest-rate contracts/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 21.10 | Interest-rate contracts/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 22.1 | Foreign-currency contracts/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | boi_RT:x10 | N/A |
| 22.2 | Foreign-currency contracts/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 22.3 | Foreign-currency contracts/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 22.4 | Foreign-currency contracts/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 22.5 | Foreign-currency contracts/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 22.6 | Foreign-currency contracts/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 22.7 | Foreign-currency contracts/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 22.8 | Foreign-currency contracts/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 22.9 | Foreign-currency contracts/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 22.10 | Foreign-currency contracts/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 23.1 | Contracts in respect of shares/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | boi_RT:x9 | N/A |
| 23.2 | Contracts in respect of shares/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 23.3 | Contracts in respect of shares/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 23.4 | Contracts in respect of shares/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 23.5 | Contracts in respect of shares/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 23.6 | Contracts in respect of shares/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 23.7 | Contracts in respect of shares/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 23.8 | Contracts in respect of shares/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 23.9 | Contracts in respect of shares/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 23.10 | Contracts in respect of shares/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 24.1 | Credit derivatives/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | boi_RT:x16 | N/A |
| 24.2 | Credit derivatives/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 24.3 | Credit derivatives/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 24.4 | Credit derivatives/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 24.5 | Credit derivatives/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 24.6 | Credit derivatives/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 24.7 | Credit derivatives/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 24.8 | Credit derivatives/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 24.9 | Credit derivatives/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 24.10 | Credit derivatives/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 25.1 | Commodity and other contracts/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | boi_RT:x16 | N/A |
| 25.2 | Commodity and other contracts/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 25.3 | Commodity and other contracts/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 25.4 | Commodity and other contracts/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 25.5 | Commodity and other contracts/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 25.6 | Commodity and other contracts/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 25.7 | Commodity and other contracts/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 25.8 | Commodity and other contracts/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 25.9 | Commodity and other contracts/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 25.10 | Commodity and other contracts/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 26.1 | Total assets in respect of derivative instruments/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| 26.2 | Total assets in respect of derivative instruments/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 26.3 | Total assets in respect of derivative instruments/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 26.4 | Total assets in respect of derivative instruments/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 26.5 | Total assets in respect of derivative instruments/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 26.6 | Total assets in respect of derivative instruments/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 26.7 | Total assets in respect of derivative instruments/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 26.8 | Total assets in respect of derivative instruments/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 26.9 | Total assets in respect of derivative instruments/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 26.10 | Total assets in respect of derivative instruments/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 27.1 | Assets - Other/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x947 | N/A | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| 27.2 | Assets - Other/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x947 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 27.3 | Assets - Other/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x947 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 27.4 | Assets - Other/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x947 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 27.5 | Assets - Other/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x947 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 27.6 | Assets - Other/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x947 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 27.7 | Assets - Other/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x947 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 27.8 | Assets - Other/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x947 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 27.9 | Assets - Other/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x947 | N/A | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 27.10 | Assets - Other/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x947 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 28.1 | Total assets/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| 28.2 | Total assets/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 28.3 | Total assets/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 28.4 | Total assets/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 28.5 | Total assets/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 28.6 | Total assets/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 28.7 | Total assets/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 28.8 | Total assets/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 28.9 | Total assets/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 28.10 | Total assets/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r33.1 | Liabilities/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| r33.2 | Liabilities/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r33.3 | Liabilities/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r33.4 | Liabilities/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r33.5 | Liabilities/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r33.6 | Liabilities/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r33.7 | Liabilities/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r33.8 | Liabilities/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r33.9 | Liabilities/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r33.10 | Liabilities/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r34.1 | Liabilities in respect of derivative instruments/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| r34.2 | Liabilities in respect of derivative instruments/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r34.3 | Liabilities in respect of derivative instruments/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r34.4 | Liabilities in respect of derivative instruments/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r34.5 | Liabilities in respect of derivative instruments/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r34.6 | Liabilities in respect of derivative instruments/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r34.7 | Liabilities in respect of derivative instruments/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r34.8 | Liabilities in respect of derivative instruments/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r34.9 | Liabilities in respect of derivative instruments/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| r34.10 | Liabilities in respect of derivative instruments/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 29.1 | Interest-rate contracts/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | boi_RT:x8 | N/A |
| 29.2 | Interest-rate contracts/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 29.3 | Interest-rate contracts/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 29.4 | Interest-rate contracts/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 29.5 | Interest-rate contracts/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 29.6 | Interest-rate contracts/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 29.7 | Interest-rate contracts/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 29.8 | Interest-rate contracts/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 29.9 | Interest-rate contracts/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 29.10 | Interest-rate contracts/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x8 | N/A |
| 30.1 | Foreign-currency contracts/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | boi_RT:x10 | N/A |
| 30.2 | Foreign-currency contracts/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 30.3 | Foreign-currency contracts/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 30.4 | Foreign-currency contracts/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 30.5 | Foreign-currency contracts/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 30.6 | Foreign-currency contracts/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 30.7 | Foreign-currency contracts/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 30.8 | Foreign-currency contracts/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 30.9 | Foreign-currency contracts/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 30.10 | Foreign-currency contracts/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x10 | N/A |
| 31.1 | Contracts in respect of shares/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | boi_RT:x9 | N/A |
| 31.2 | Contracts in respect of shares/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 31.3 | Contracts in respect of shares/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 31.4 | Contracts in respect of shares/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 31.5 | Contracts in respect of shares/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 31.6 | Contracts in respect of shares/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 31.7 | Contracts in respect of shares/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 31.8 | Contracts in respect of shares/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 31.9 | Contracts in respect of shares/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 31.10 | Contracts in respect of shares/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x9 | N/A |
| 32.1 | Credit derivatives/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | boi_RT:x16 | N/A |
| 32.2 | Credit derivatives/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 32.3 | Credit derivatives/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 32.4 | Credit derivatives/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 32.5 | Credit derivatives/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 32.6 | Credit derivatives/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 32.7 | Credit derivatives/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 32.8 | Credit derivatives/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 32.9 | Credit derivatives/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 32.10 | Credit derivatives/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 33.1 | Commodity and other contracts/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | boi_RT:x16 | N/A |
| 33.2 | Commodity and other contracts/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 33.3 | Commodity and other contracts/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 33.4 | Commodity and other contracts/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 33.5 | Commodity and other contracts/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 33.6 | Commodity and other contracts/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 33.7 | Commodity and other contracts/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 33.8 | Commodity and other contracts/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 33.9 | Commodity and other contracts/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 33.10 | Commodity and other contracts/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_RT:x16 | N/A |
| 34.1 | Total in respect of derivative instruments/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| 34.2 | Total in respect of derivative instruments/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 34.3 | Total in respect of derivative instruments/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 34.4 | Total in respect of derivative instruments/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 34.5 | Total in respect of derivative instruments/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 34.6 | Total in respect of derivative instruments/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 34.7 | Total in respect of derivative instruments/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 34.8 | Total in respect of derivative instruments/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 34.9 | Total in respect of derivative instruments/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 34.10 | Total in respect of derivative instruments/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 35.1 | Other liabilities/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x960 | N/A | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| 35.2 | Other liabilities/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x960 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 35.3 | Other liabilities/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x960 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 35.4 | Other liabilities/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x960 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 35.5 | Other liabilities/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x960 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 35.6 | Other liabilities/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x960 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 35.7 | Other liabilities/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x960 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 35.8 | Other liabilities/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x960 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 35.9 | Other liabilities/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x960 | N/A | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 35.10 | Other liabilities/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x960 | boi_MU:x1 | N/A | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 36.1 | Total liabilities/Fair value for start of year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RP:x22 | N/A | N/A |
| 36.2 | Total liabilities/Realized or unrealized profits | boi_met:md369 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 36.3 | Total liabilities/Purchases and issues | boi_met:md368 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 36.4 | Total liabilities/Sales | boi_met:md367 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 36.5 | Total liabilities/Settlements | boi_met:md366 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 36.6 | Total liabilities/Reconciliations from translation of fin. rep. | boi_met:md365 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 36.7 | Total liabilities/Transfers to Level 3 | boi_met:md364 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 36.8 | Total liabilities/Transfers from Level 3 | boi_met:md363 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 36.9 | Total liabilities/Fair value for year-end | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | N/A | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
| 36.10 | Total liabilities/Unrealized profit on instruments for year-end | boi_met:md701 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_MU:x1 | boi_NE:x3 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A | N/A |
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