| r0.1 | label_boi_a2/Reconciliations for presentation of bonds available for sale at fair value | | | | N/A | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x1 | boi_RP:x19 | N/A |
| r0.2 | label_boi_a2/Net translation adjustments after effect of hedges | | | | N/A | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x30 | boi_RP:x19 | N/A |
| r0.3 | label_boi_a2/Net profits (losses) on cash flow hedges | | | | N/A | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x27 | boi_RP:x19 | N/A |
| r0.4 | label_boi_a2/Reconciliations in respect of employee rights | | | | N/A | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x53 | boi_RP:x19 | N/A |
| r0.5 | label_boi_a2/Total | | | | N/A | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x36 | boi_RP:x19 | N/A |
| r0.6 | label_boi_a2/Other overall profit attributed to minority interest | | | | N/A | boi_CN:x2 | boi_CS:x2 | boi_MC:x399 | boi_PL:x36 | boi_RP:x19 | N/A |
| r0.7 | label_boi_a2/Other overall profit attributed to banking corporation's shareholders | | | | N/A | boi_CN:x1 | boi_CS:x2 | boi_MC:x399 | boi_PL:x36 | boi_RP:x19 | N/A |
| 1.1 | Balance for start of period/Reconciliations for presentation of bonds available for sale at fair value | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x1 | boi_RP:x19 | boi_RP:x8 |
| 1.2 | Balance for start of period/Net translation adjustments after effect of hedges | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x30 | boi_RP:x19 | boi_RP:x8 |
| 1.3 | Balance for start of period/Net profits (losses) on cash flow hedges | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x27 | boi_RP:x19 | boi_RP:x8 |
| 1.4 | Balance for start of period/Reconciliations in respect of employee rights | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x53 | boi_RP:x19 | boi_RP:x8 |
| 1.5 | Balance for start of period/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x36 | boi_RP:x19 | boi_RP:x8 |
| 1.6 | Balance for start of period/Other overall profit attributed to minority interest | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CN:x2 | boi_CS:x2 | boi_MC:x399 | boi_PL:x36 | boi_RP:x19 | boi_RP:x8 |
| 1.7 | Balance for start of period/Other overall profit attributed to banking corporation's shareholders | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CN:x1 | boi_CS:x2 | boi_MC:x399 | boi_PL:x36 | boi_RP:x19 | boi_RP:x8 |
| 2.1 | Change during the period/Reconciliations for presentation of bonds available for sale at fair value | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x1 | boi_RP:x19 | N/A |
| 2.2 | Change during the period/Net translation adjustments after effect of hedges | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x30 | boi_RP:x19 | N/A |
| 2.3 | Change during the period/Net profits (losses) on cash flow hedges | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x27 | boi_RP:x19 | N/A |
| 2.4 | Change during the period/Reconciliations in respect of employee rights | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x53 | boi_RP:x19 | N/A |
| 2.5 | Change during the period/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x36 | boi_RP:x19 | N/A |
| 2.6 | Change during the period/Other overall profit attributed to minority interest | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x399 | boi_PL:x36 | boi_RP:x19 | N/A |
| 2.7 | Change during the period/Other overall profit attributed to banking corporation's shareholders | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x399 | boi_PL:x36 | boi_RP:x19 | N/A |
| 3.1 | Balance for end of period/Reconciliations for presentation of bonds available for sale at fair value | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x1 | boi_RP:x19 | N/A |
| 3.2 | Balance for end of period/Net translation adjustments after effect of hedges | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x30 | boi_RP:x19 | N/A |
| 3.3 | Balance for end of period/Net profits (losses) on cash flow hedges | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x27 | boi_RP:x19 | N/A |
| 3.4 | Balance for end of period/Reconciliations in respect of employee rights | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x53 | boi_RP:x19 | N/A |
| 3.5 | Balance for end of period/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | N/A | boi_CS:x2 | boi_MC:x399 | boi_PL:x36 | boi_RP:x19 | N/A |
| 3.6 | Balance for end of period/Other overall profit attributed to minority interest | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CN:x2 | boi_CS:x2 | boi_MC:x399 | boi_PL:x36 | boi_RP:x19 | N/A |
| 3.7 | Balance for end of period/Other overall profit attributed to banking corporation's shareholders | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CN:x1 | boi_CS:x2 | boi_MC:x399 | boi_PL:x36 | boi_RP:x19 | N/A |