| r0.1 | label_boi_a2/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x1 | N/A | N/A | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| r0.2 | label_boi_a2/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x1 | N/A | N/A | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| r0.3 | label_boi_a2/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x1 | N/A | N/A | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| r0.4 | label_boi_a2/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x2 | N/A | N/A | N/A | boi_RP:x24 | N/A | N/A |
| r0.5 | label_boi_a2/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | N/A | N/A | N/A | boi_RP:x24 | N/A | N/A |
| r1.1 | Bonds available for sale and non trade securities/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| r1.2 | Bonds available for sale and non trade securities/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| r1.3 | Bonds available for sale and non trade securities/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| r1.4 | Bonds available for sale and non trade securities/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x2 | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| r1.5 | Bonds available for sale and non trade securities/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 1.1 | Of Israel Government/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | boi_SE:x11 |
| 1.2 | Of Israel Government/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | boi_SE:x11 |
| 1.3 | Of Israel Government/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_SE:x11 |
| 1.4 | Of Israel Government/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x2 | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x11 |
| 1.5 | Of Israel Government/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x11 |
| 2.1 | Of foreign governments/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | boi_SE:x11 |
| 2.2 | Of foreign governments/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | boi_SE:x11 |
| 2.3 | Of foreign governments/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_SE:x11 |
| 2.4 | Of foreign governments/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x2 | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x11 |
| 2.5 | Of foreign governments/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x11 |
| 3.1 | Of financial institutions in Israel/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | boi_SE:x9 |
| 3.2 | Of financial institutions in Israel/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | boi_SE:x9 |
| 3.3 | Of financial institutions in Israel/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_SE:x9 |
| 3.4 | Of financial institutions in Israel/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x2 | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x9 |
| 3.5 | Of financial institutions in Israel/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x9 |
| 4.1 | Of foreign financial institutions/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | boi_SE:x9 |
| 4.2 | Of foreign financial institutions/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | boi_SE:x9 |
| 4.3 | Of foreign financial institutions/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_SE:x9 |
| 4.4 | Of foreign financial institutions/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x2 | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x9 |
| 4.5 | Of foreign financial institutions/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x9 |
| 5.1 | Asset-backed or mortgage-backed/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 5.2 | Asset-backed or mortgage-backed/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 5.3 | Asset-backed or mortgage-backed/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 5.4 | Asset-backed or mortgage-backed/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_NE:x2 | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 5.5 | Asset-backed or mortgage-backed/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | N/A | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 6.1 | Of others in Israel/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | boi_SE:x69 |
| 6.2 | Of others in Israel/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | boi_SE:x69 |
| 6.3 | Of others in Israel/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_SE:x69 |
| 6.4 | Of others in Israel/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x2 | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x69 |
| 6.5 | Of others in Israel/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x69 |
| 7.1 | Of others abroad/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | boi_SE:x69 |
| 7.2 | Of others abroad/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | boi_SE:x69 |
| 7.3 | Of others abroad/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_SE:x69 |
| 7.4 | Of others abroad/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x2 | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x69 |
| 7.5 | Of others abroad/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x69 |
| 8.1 | Shares/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 8.2 | Shares/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 8.3 | Shares/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 8.4 | Shares/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_NE:x2 | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 8.5 | Shares/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | N/A | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 9.1 | Other (if breakdown is not material)/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 9.2 | Other (if breakdown is not material)/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 9.3 | Other (if breakdown is not material)/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 9.4 | Other (if breakdown is not material)/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x2 | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 9.5 | Other (if breakdown is not material)/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | N/A | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 10.1 | Total securities available for sale/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 10.2 | Total securities available for sale/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 10.3 | Total securities available for sale/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x1 | boi_PL:x1 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 10.4 | Total securities available for sale/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x2 | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 10.5 | Total securities available for sale/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | N/A | boi_PL:x1 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| r12.1 | Securities for trading/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| r12.2 | Securities for trading/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| r12.3 | Securities for trading/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| r12.4 | Securities for trading/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x2 | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| r12.5 | Securities for trading/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 11.1 | Of Israel Government/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | boi_SE:x11 |
| 11.2 | Of Israel Government/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | boi_SE:x11 |
| 11.3 | Of Israel Government/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_SE:x11 |
| 11.4 | Of Israel Government/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x2 | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x11 |
| 11.5 | Of Israel Government/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x11 |
| 12.1 | Of foreign governments/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | boi_SE:x11 |
| 12.2 | Of foreign governments/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | boi_SE:x11 |
| 12.3 | Of foreign governments/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_SE:x11 |
| 12.4 | Of foreign governments/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x2 | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x11 |
| 12.5 | Of foreign governments/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x11 |
| 13.1 | Of financial institutions in Israel/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | boi_SE:x9 |
| 13.2 | Of financial institutions in Israel/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | boi_SE:x9 |
| 13.3 | Of financial institutions in Israel/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_SE:x9 |
| 13.4 | Of financial institutions in Israel/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x2 | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x9 |
| 13.5 | Of financial institutions in Israel/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x9 |
| 14.1 | Of foreign financial institutions/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | boi_SE:x9 |
| 14.2 | Of foreign financial institutions/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | boi_SE:x9 |
| 14.3 | Of foreign financial institutions/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_SE:x9 |
| 14.4 | Of foreign financial institutions/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x2 | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x9 |
| 14.5 | Of foreign financial institutions/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x9 |
| 15.1 | Asset-backed or mortgage-backed/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 15.2 | Asset-backed or mortgage-backed/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 15.3 | Asset-backed or mortgage-backed/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 15.4 | Asset-backed or mortgage-backed/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | boi_NE:x2 | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 15.5 | Asset-backed or mortgage-backed/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x942 | N/A | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 16.1 | Of others in Israel/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | boi_SE:x69 |
| 16.2 | Of others in Israel/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | boi_SE:x69 |
| 16.3 | Of others in Israel/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_SE:x69 |
| 16.4 | Of others in Israel/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | boi_NE:x2 | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x69 |
| 16.5 | Of others in Israel/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x1 | boi_MC:x941 | N/A | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x69 |
| 17.1 | Of others abroad/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | boi_SE:x69 |
| 17.2 | Of others abroad/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | boi_SE:x69 |
| 17.3 | Of others abroad/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | boi_SE:x69 |
| 17.4 | Of others abroad/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | boi_NE:x2 | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x69 |
| 17.5 | Of others abroad/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | boi_GA:x2 | boi_MC:x941 | N/A | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | boi_SE:x69 |
| 18.1 | Shares/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 18.2 | Shares/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 18.3 | Shares/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 18.4 | Shares/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | boi_NE:x2 | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 18.5 | Shares/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x943 | N/A | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 19.1 | Other (if breakdown is not material)/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 19.2 | Other (if breakdown is not material)/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 19.3 | Other (if breakdown is not material)/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 19.4 | Other (if breakdown is not material)/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x2 | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 19.5 | Other (if breakdown is not material)/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | N/A | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 20.1 | Total securities for trading/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 20.2 | Total securities for trading/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 20.3 | Total securities for trading/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x1 | boi_PL:x2 | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 20.4 | Total securities for trading/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | boi_NE:x2 | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 20.5 | Total securities for trading/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x940 | N/A | boi_PL:x2 | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| r23.1 | Assets on account of derivatives/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| r23.2 | Assets on account of derivatives/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| r23.3 | Assets on account of derivatives/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| r23.4 | Assets on account of derivatives/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| r23.5 | Assets on account of derivatives/Balance-sheet | 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:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 21.1 | NIS-CPI contracts/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | boi_RT:x12 | N/A |
| 21.2 | NIS-CPI contracts/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | boi_RT:x12 | N/A |
| 21.3 | NIS-CPI contracts/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RT:x12 | N/A |
| 21.4 | NIS-CPI contracts/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x12 | N/A |
| 21.5 | NIS-CPI contracts/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x12 | N/A |
| 22.1 | Other interest contracts/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | boi_RT:x13 | N/A |
| 22.2 | Other interest contracts/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | boi_RT:x13 | N/A |
| 22.3 | Other interest contracts/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RT:x13 | N/A |
| 22.4 | Other interest contracts/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x13 | N/A |
| 22.5 | Other interest contracts/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x13 | N/A |
| 23.1 | Foreign-currency contracts/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | boi_RT:x10 | N/A |
| 23.2 | Foreign-currency contracts/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | boi_RT:x10 | N/A |
| 23.3 | Foreign-currency contracts/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RT:x10 | N/A |
| 23.4 | Foreign-currency contracts/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x10 | N/A |
| 23.5 | Foreign-currency contracts/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x10 | N/A |
| 24.1 | Contracts on account of shares/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | boi_RT:x9 | N/A |
| 24.2 | Contracts on account of shares/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | boi_RT:x9 | N/A |
| 24.3 | Contracts on account of shares/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RT:x9 | N/A |
| 24.4 | Contracts on account of shares/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x9 | N/A |
| 24.5 | Contracts on account of shares/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x9 | N/A |
| 25.1 | Credit derivatives/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | boi_RT:x16 | N/A |
| 25.2 | Credit derivatives/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | boi_RT:x16 | N/A |
| 25.3 | Credit derivatives/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RT:x16 | N/A |
| 25.4 | Credit derivatives/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x16 | N/A |
| 25.5 | Credit derivatives/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x16 | N/A |
| 26.1 | Commodity and other contracts/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | boi_RT:x16 | N/A |
| 26.2 | Commodity and other contracts/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | boi_RT:x16 | N/A |
| 26.3 | Commodity and other contracts/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RT:x16 | N/A |
| 26.4 | Commodity and other contracts/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x16 | N/A |
| 26.5 | Commodity and other contracts/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x16 | N/A |
| 27.1 | Assets on account of derivatives/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 27.2 | Assets on account of derivatives/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 27.3 | Assets on account of derivatives/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 27.4 | Assets on account of derivatives/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 27.5 | Assets on account of derivatives/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 28.1 | Other/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x947 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 28.2 | Other/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x947 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 28.3 | Other/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x947 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 28.4 | Other/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x947 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 28.5 | Other/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x947 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 29.1 | Total/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 29.2 | Total/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 29.3 | Total/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 29.4 | Total/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 29.5 | Total/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 30.1 | Assets transferred from Level 2 to Level 1/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_NE:x1 | N/A | boi_PL:x50 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 30.2 | Assets transferred from Level 2 to Level 1/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_NE:x1 | N/A | boi_PL:x50 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 30.3 | Assets transferred from Level 2 to Level 1/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_NE:x1 | N/A | boi_PL:x50 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 30.4 | Assets transferred from Level 2 to Level 1/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_NE:x2 | N/A | boi_PL:x50 | N/A | boi_RP:x24 | N/A | N/A |
| 30.5 | Assets transferred from Level 2 to Level 1/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | N/A | N/A | boi_PL:x50 | N/A | boi_RP:x24 | N/A | N/A |
| 31.1 | Assets transferred from Level 1 to Level 2/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_NE:x1 | N/A | boi_PL:x49 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 31.2 | Assets transferred from Level 1 to Level 2/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_NE:x1 | N/A | boi_PL:x49 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 31.3 | Assets transferred from Level 1 to Level 2/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_NE:x1 | N/A | boi_PL:x49 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 31.4 | Assets transferred from Level 1 to Level 2/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | boi_NE:x2 | N/A | boi_PL:x49 | N/A | boi_RP:x24 | N/A | N/A |
| 31.5 | Assets transferred from Level 1 to Level 2/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x1 | N/A | N/A | boi_PL:x49 | N/A | boi_RP:x24 | N/A | N/A |
| r35.1 | Liabilities on account of derivatives/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| r35.2 | Liabilities on account of derivatives/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| r35.3 | Liabilities on account of derivatives/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| r35.4 | Liabilities on account of derivatives/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| r35.5 | Liabilities on account of derivatives/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 32.1 | NIS-CPI contracts/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | boi_RT:x12 | N/A |
| 32.2 | NIS-CPI contracts/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | boi_RT:x12 | N/A |
| 32.3 | NIS-CPI contracts/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RT:x12 | N/A |
| 32.4 | NIS-CPI contracts/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x12 | N/A |
| 32.5 | NIS-CPI contracts/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x12 | N/A |
| 33.1 | Other interest contracts/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | boi_RT:x13 | N/A |
| 33.2 | Other interest contracts/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | boi_RT:x13 | N/A |
| 33.3 | Other interest contracts/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RT:x13 | N/A |
| 33.4 | Other interest contracts/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x13 | N/A |
| 33.5 | Other interest contracts/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x13 | N/A |
| 34.1 | Foreign-currency contracts/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | boi_RT:x10 | N/A |
| 34.2 | Foreign-currency contracts/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | boi_RT:x10 | N/A |
| 34.3 | Foreign-currency contracts/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RT:x10 | N/A |
| 34.4 | Foreign-currency contracts/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x10 | N/A |
| 34.5 | Foreign-currency contracts/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x10 | N/A |
| 35.1 | Contracts on account of shares/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | boi_RT:x9 | N/A |
| 35.2 | Contracts on account of shares/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | boi_RT:x9 | N/A |
| 35.3 | Contracts on account of shares/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RT:x9 | N/A |
| 35.4 | Contracts on account of shares/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x9 | N/A |
| 35.5 | Contracts on account of shares/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x9 | N/A |
| 36.1 | Credit derivatives/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | boi_RT:x16 | N/A |
| 36.2 | Credit derivatives/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | boi_RT:x16 | N/A |
| 36.3 | Credit derivatives/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RT:x16 | N/A |
| 36.4 | Credit derivatives/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x16 | N/A |
| 36.5 | Credit derivatives/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x945 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x16 | N/A |
| 37.1 | Commodity and other contracts/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | boi_RT:x16 | N/A |
| 37.2 | Commodity and other contracts/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | boi_RT:x16 | N/A |
| 37.3 | Commodity and other contracts/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | boi_RT:x16 | N/A |
| 37.4 | Commodity and other contracts/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x16 | N/A |
| 37.5 | Commodity and other contracts/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x946 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | boi_RT:x16 | N/A |
| 38.1 | Liabilities on account of derivatives/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 38.2 | Liabilities on account of derivatives/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 38.3 | Liabilities on account of derivatives/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 38.4 | Liabilities on account of derivatives/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 38.5 | Liabilities on account of derivatives/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x944 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 39.1 | Other/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x960 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 39.2 | Other/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x960 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 39.3 | Other/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x960 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 39.4 | Other/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x960 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 39.5 | Other/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x960 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 40.1 | Total/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 40.2 | Total/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 40.3 | Total/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_NE:x1 | N/A | boi_PL:x48 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 40.4 | Total/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_NE:x2 | N/A | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 40.5 | Total/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | N/A | N/A | boi_PL:x48 | N/A | boi_RP:x24 | N/A | N/A |
| 41.1 | Liabilities transferred from Level 1 to Level 2/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_NE:x1 | N/A | boi_PL:x49 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 41.2 | Liabilities transferred from Level 1 to Level 2/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_NE:x1 | N/A | boi_PL:x49 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 41.3 | Liabilities transferred from Level 1 to Level 2/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_NE:x1 | N/A | boi_PL:x49 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 41.4 | Liabilities transferred from Level 1 to Level 2/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_NE:x2 | N/A | boi_PL:x49 | N/A | boi_RP:x24 | N/A | N/A |
| 41.5 | Liabilities transferred from Level 1 to Level 2/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | N/A | N/A | boi_PL:x49 | N/A | boi_RP:x24 | N/A | N/A |
| 42.1 | Liabilities transferred from Level 2 to Level 1/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_NE:x1 | N/A | boi_PL:x50 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 42.2 | Liabilities transferred from Level 2 to Level 1/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_NE:x1 | N/A | boi_PL:x50 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 42.3 | Liabilities transferred from Level 2 to Level 1/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_NE:x1 | N/A | boi_PL:x50 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 42.4 | Liabilities transferred from Level 2 to Level 1/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | boi_NE:x2 | N/A | boi_PL:x50 | N/A | boi_RP:x24 | N/A | N/A |
| 42.5 | Liabilities transferred from Level 2 to Level 1/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x3 | N/A | N/A | boi_PL:x50 | N/A | boi_RP:x24 | N/A | N/A |
| 43.1 | Impaired credit collectible as dependency on collateral/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x672 | boi_NE:x1 | N/A | boi_PL:x47 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 43.2 | Impaired credit collectible as dependency on collateral/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x672 | boi_NE:x1 | N/A | boi_PL:x47 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 43.3 | Impaired credit collectible as dependency on collateral/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x672 | boi_NE:x1 | N/A | boi_PL:x47 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 43.4 | Impaired credit collectible as dependency on collateral/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x672 | boi_NE:x2 | N/A | boi_PL:x47 | N/A | boi_RP:x24 | N/A | N/A |
| 43.5 | Impaired credit collectible as dependency on collateral/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x672 | N/A | N/A | boi_PL:x47 | N/A | boi_RP:x24 | N/A | N/A |
| 44.1 | Other/Prices quoted in active market Level 1 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x673 | boi_NE:x1 | N/A | boi_PL:x47 | boi_PL:x38 | boi_RP:x24 | N/A | N/A |
| 44.2 | Other/Other Significant observed data Level 2 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x673 | boi_NE:x1 | N/A | boi_PL:x47 | boi_PL:x39 | boi_RP:x24 | N/A | N/A |
| 44.3 | Other/Significant unobserved data Level 3 | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x673 | boi_NE:x1 | N/A | boi_PL:x47 | boi_PL:x40 | boi_RP:x24 | N/A | N/A |
| 44.4 | Other/Effect of offset agreements | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x673 | boi_NE:x2 | N/A | boi_PL:x47 | N/A | boi_RP:x24 | N/A | N/A |
| 44.5 | Other/Balance-sheet | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x5 | boi_CS:x2 | boi_FN:x1 | N/A | boi_MC:x673 | N/A | N/A | boi_PL:x47 | N/A | boi_RP:x24 | N/A | N/A |