| r0.1 | label_boi_a2/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | boi_RP:x24 | boi_SE:x11 |
| r0.2 | label_boi_a2/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | boi_RP:x24 | boi_SE:x11 |
| 1.1 | Credit related to saving plans/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | boi_MC:x14 | boi_RP:x24 | boi_SE:x11 |
| 1.2 | Credit related to saving plans/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_MC:x14 | boi_RP:x24 | boi_SE:x11 |
| 2.1 | Credit funds from the issuance of debentures/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | boi_MC:x11 | boi_RP:x24 | boi_SE:x11 |
| 2.2 | Credit funds from the issuance of debentures/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_MC:x11 | boi_RP:x24 | boi_SE:x11 |
| 3.1 | Credit from agreement for supplemental interest to entitled from ministry of housing/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | boi_MC:x12 | boi_RP:x24 | boi_SE:x11 |
| 3.2 | Credit from agreement for supplemental interest to entitled from ministry of housing/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_MC:x12 | boi_RP:x24 | boi_SE:x11 |
| 4.1 | Supplemental interest from Prime Minister/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | boi_MC:x24 | boi_RP:x24 | boi_SE:x11 |
| 4.2 | Supplemental interest from Prime Minister/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_MC:x24 | boi_RP:x24 | boi_SE:x11 |
| 5.1 | Other credit/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | boi_MC:x23 | boi_RP:x24 | boi_SE:x11 |
| 5.2 | Other credit/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_MC:x23 | boi_RP:x24 | boi_SE:x11 |
| 6.1 | Total credit to government/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | boi_SE:x11 |
| 6.2 | Total credit to government/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_MC:x8 | boi_RP:x24 | boi_SE:x11 |
| 7.1 | of which: credit to foreign governments/Consolidated | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | boi_RP:x24 | boi_SE:x11 |
| 7.2 | of which: credit to foreign governments/Bank Corporation | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_GA:x2 | boi_MC:x8 | boi_RP:x24 | boi_SE:x11 |