| r0.1 | label_boi_a2/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | boi_RP:x24 | N/A | N/A | N/A |
| r0.2 | label_boi_a2/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_RP:x24 | N/A | N/A | N/A |
| 1.1 | Cash and deposits with central banks/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x9 | boi_RP:x24 | boi_SE:x2 | N/A | N/A |
| 1.2 | Cash and deposits with central banks/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x9 | boi_RP:x24 | boi_SE:x2 | N/A | N/A |
| 2.1 | Deposits with commercial banks/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x13 | boi_RP:x24 | boi_SE:x17 | N/A | N/A |
| 2.2 | Deposits with commercial banks/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x13 | boi_RP:x24 | boi_SE:x17 | N/A | N/A |
| r3.1 | Deposits in banks intended to give credit to the public/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x10 | boi_RP:x24 | boi_SE:x17 | N/A | N/A |
| r3.2 | Deposits in banks intended to give credit to the public/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x10 | boi_RP:x24 | boi_SE:x17 | N/A | N/A |
| 3.1 | To the public/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x10 | boi_RP:x24 | boi_SE:x17 | boi_SE:x16 | N/A |
| 3.2 | To the public/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x10 | boi_RP:x24 | boi_SE:x17 | boi_SE:x16 | N/A |
| 4.1 | For goverment/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x10 | boi_RP:x24 | boi_SE:x17 | boi_SE:x11 | N/A |
| 4.2 | For goverment/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x10 | boi_RP:x24 | boi_SE:x17 | boi_SE:x11 | N/A |
| 5.1 | Deposits in unique corporated banks/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | boi_RP:x24 | boi_SE:x19 | N/A | N/A |
| 5.2 | Deposits in unique corporated banks/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x19 | N/A | N/A |
| 6.1 | Total/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x9 | boi_RP:x24 | boi_SE:x1 | N/A | N/A |
| 6.2 | Total/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x9 | boi_RP:x24 | boi_SE:x1 | N/A | N/A |
| 7.1 | Of which: For original period up to 3 months/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x9 | boi_RP:x24 | boi_SE:x1 | N/A | boi_TI:x5 |
| 7.2 | Of which: For original period up to 3 months/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_MC:x9 | boi_RP:x24 | boi_SE:x1 | N/A | boi_TI:x5 |