| r0.1 | label_boi_a2/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | N/A | boi_MU:x1 | N/A | boi_RP:x25 |
| r1.1 | Net profit/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | N/A | boi_RP:x25 |
| 1.1 | Before attributed to holders of noncontrolling interest/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | N/A | boi_RP:x25 |
| 2.1 | Attributed to holders of noncontrolling interest/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | N/A | boi_RP:x25 |
| 3.1 | Net profit attributed to shareholders of the banking corporation/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | N/A | boi_RP:x25 |
| 4.1 | Adjustment in respect of presentation of bonds available for sale at fair value, net/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | boi_MU:x1 | boi_PL:x1 | boi_RP:x25 |
| 5.1 | Financial statements translation adjustments,net,afoter the effect of hedges/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | boi_MU:x1 | boi_PL:x30 | boi_RP:x25 |
| 6.1 | Reconciliations of liabilities in respect of employee rights/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | boi_MU:x1 | boi_PL:x53 | boi_RP:x25 |
| 7.1 | Gains (losses) on cash flow hedges/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | boi_MU:x1 | boi_PL:x27 | boi_RP:x25 |
| 8.1 | Other comprehensive gains (losses) before taxes/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | boi_MU:x1 | boi_PL:x36 | boi_RP:x25 |
| 9.1 | Related tax effect/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x408 | boi_MU:x1 | boi_PL:x36 | boi_RP:x25 |
| r11.1 | Other comprehensive profit (loss)/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x399 | boi_MU:x1 | boi_PL:x36 | boi_RP:x25 |
| 10.1 | Before attribution to non-controlling interests/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x399 | boi_MU:x1 | boi_PL:x36 | boi_RP:x25 |
| 11.1 | Attributable to non-controlling interests/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x399 | boi_MU:x1 | boi_PL:x36 | boi_RP:x25 |
| 12.1 | Attributable to shareholders of the banking corporation/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x399 | boi_MU:x1 | boi_PL:x36 | boi_RP:x25 |
| r15.1 | Comprehensive profit/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x407 | boi_MU:x1 | N/A | boi_RP:x25 |
| 13.1 | Profit before attribution to non-controlling interests/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x407 | boi_MU:x1 | N/A | boi_RP:x25 |
| 14.1 | Overall profit atttributed to minority interest/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x407 | boi_MU:x1 | N/A | boi_RP:x25 |
| 15.1 | Overall profit attributed to the banking corporation's shareholders/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x407 | boi_MU:x1 | N/A | boi_RP:x25 |