| r0.1 | label_boi_a2/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x2 | N/A | N/A | boi_MU:x1 | boi_RP:x25 | N/A |
| r0.2 | label_boi_a2/Bank Corporation | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x1 | N/A | N/A | boi_MU:x1 | boi_RP:x25 | N/A |
| 1.1 | Current taxes In respect of current year/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x2 | N/A | boi_MC:x415 | boi_MU:x1 | boi_RP:x25 | N/A |
| 1.2 | Current taxes In respect of current year/Bank Corporation | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x1 | N/A | boi_MC:x415 | boi_MU:x1 | boi_RP:x25 | N/A |
| 2.1 | In respect of prior years/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x2 | N/A | boi_MC:x415 | boi_MU:x1 | boi_RP:x25 | boi_RP:x11 |
| 2.2 | In respect of prior years/Bank Corporation | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x1 | N/A | boi_MC:x415 | boi_MU:x1 | boi_RP:x25 | boi_RP:x11 |
| 3.1 | Total current taxes/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x2 | N/A | boi_MC:x415 | boi_MU:x1 | boi_RP:x25 | boi_RP:x8 |
| 3.2 | Total current taxes/Bank Corporation | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x1 | N/A | boi_MC:x415 | boi_MU:x1 | boi_RP:x25 | boi_RP:x8 |
| 4.1 | Add (deduct) tax deferred in respect of current year/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x2 | N/A | boi_MC:x430 | boi_MU:x1 | boi_RP:x25 | N/A |
| 4.2 | Add (deduct) tax deferred in respect of current year/Bank Corporation | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x1 | N/A | boi_MC:x430 | boi_MU:x1 | boi_RP:x25 | N/A |
| 5.1 | In respect of prior years/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x2 | N/A | boi_MC:x430 | boi_MU:x1 | boi_RP:x25 | boi_RP:x11 |
| 5.2 | In respect of prior years/Bank Corporation | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x1 | N/A | boi_MC:x430 | boi_MU:x1 | boi_RP:x25 | boi_RP:x11 |
| 6.1 | Total tax deferred/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x2 | N/A | boi_MC:x430 | boi_MU:x1 | boi_RP:x25 | boi_RP:x8 |
| 6.2 | Total tax deferred/Bank Corporation | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x1 | N/A | boi_MC:x430 | boi_MU:x1 | boi_RP:x25 | boi_RP:x8 |
| 7.1 | Provision for taxes on income/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x2 | N/A | boi_MC:x190 | boi_MU:x1 | boi_RP:x25 | N/A |
| 7.2 | Provision for taxes on income/Bank Corporation | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x1 | N/A | boi_MC:x190 | boi_MU:x1 | boi_RP:x25 | N/A |
| 8.1 | Of which: Provision for taxes abroad/Consolidated | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x2 | boi_GA:x2 | boi_MC:x190 | boi_MU:x1 | boi_RP:x25 | N/A |
| 8.2 | Of which: Provision for taxes abroad/Bank Corporation | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | boi_CS:x1 | boi_GA:x2 | boi_MC:x190 | boi_MU:x1 | boi_RP:x25 | N/A |