| r0.1 | label_boi_a2/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | N/A | N/A | N/A | boi_RP:x19 |
| r0.2 | label_boi_a2/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | N/A | boi_MU:x1 | N/A | boi_RP:x24 |
| r1.1 | Net profit/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | N/A | N/A | boi_RP:x19 |
| r1.2 | Net profit/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | N/A | boi_RP:x24 |
| 1.1 | Before attribution to non-controlling interests/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | N/A | N/A | boi_RP:x19 |
| 1.2 | Before attribution to non-controlling interests/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | N/A | boi_RP:x24 |
| 2.1 | Attributed to non-controlling interests/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x121 | N/A | N/A | boi_RP:x19 |
| 2.2 | Attributed to non-controlling interests/Audited | 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:x24 |
| 3.1 | Attributed to the banking corporation's shareholders/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | N/A | N/A | boi_RP:x19 |
| 3.2 | Attributed to the banking corporation's shareholders/Audited | 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:x24 |
| r5.1 | Other overall profit (loss) before taxes/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | N/A | N/A | boi_RP:x19 |
| r5.2 | Other overall profit (loss) before taxes/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | boi_MU:x1 | N/A | boi_RP:x24 |
| 4.1 | Reconciliations in respect of bonds available for sale at fair value/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | N/A | boi_PL:x1 | boi_RP:x19 |
| 4.2 | Reconciliations in respect of bonds available for sale at fair value/Audited | 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:x24 |
| 5.1 | Reconciliations from translation of financial statements, net, after effect of tax and hedges/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | N/A | boi_PL:x30 | boi_RP:x19 |
| 5.2 | Reconciliations from translation of financial statements, net, after effect of tax and hedges/Audited | 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:x24 |
| 6.1 | Reconciliations of liabilities in respect of employee rights/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | N/A | boi_PL:x53 | boi_RP:x19 |
| 6.2 | Reconciliations of liabilities in respect of employee rights/Audited | 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:x24 |
| 7.1 | Net profits (losses) in respect of cash flow hedges/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | N/A | boi_PL:x27 | boi_RP:x19 |
| 7.2 | Net profits (losses) in respect of cash flow hedges/Audited | 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:x24 |
| 8.1 | Other profit (loss) before taxes/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x406 | N/A | boi_PL:x36 | boi_RP:x19 |
| 8.2 | Other profit (loss) before taxes/Audited | 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:x24 |
| 9.1 | Related tax effect/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x408 | N/A | boi_PL:x36 | boi_RP:x19 |
| 9.2 | Related tax effect/Audited | 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:x24 |
| r12.1 | Other overall profit (loss)/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x399 | N/A | boi_PL:x36 | boi_RP:x19 |
| r12.2 | Other overall profit (loss)/Audited | 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:x24 |
| 10.1 | Before attribution to minority interest/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x399 | N/A | boi_PL:x36 | boi_RP:x19 |
| 10.2 | Before attribution to minority interest/Audited | 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:x24 |
| 11.1 | Attributed to non-controlling interests/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x399 | N/A | boi_PL:x36 | boi_RP:x19 |
| 11.2 | Attributed to non-controlling interests/Audited | 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:x24 |
| 12.1 | Attributed to the banking corporation's shareholders, after taxes/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x399 | N/A | boi_PL:x36 | boi_RP:x19 |
| 12.2 | Attributed to the banking corporation's shareholders, after taxes/Audited | 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:x24 |
| r16.1 | Profit/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x407 | N/A | N/A | boi_RP:x19 |
| r16.2 | Profit/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x407 | boi_MU:x1 | N/A | boi_RP:x24 |
| 13.1 | Profit before attribution to non-controlling interests/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x407 | N/A | N/A | boi_RP:x19 |
| 13.2 | Profit before attribution to non-controlling interests/Audited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x407 | boi_MU:x1 | N/A | boi_RP:x24 |
| 14.1 | Profit atttributed to non-controlling interests/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x407 | N/A | N/A | boi_RP:x19 |
| 14.2 | Profit atttributed to non-controlling interests/Audited | 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:x24 |
| 15.1 | Profit attributed to the banking corporation's shareholders/Unaudited | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x407 | N/A | N/A | boi_RP:x19 |
| 15.2 | Profit attributed to the banking corporation's shareholders/Audited | 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:x24 |