| r0.1 | label_boi_a2/Risk-weighted assets | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | boi_RP:x16 | N/A |
| r0.2 | label_boi_a2/Minimum capital requirements | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | N/A | N/A |
| 1.1 | Credit risk (standardized approach)/Risk-weighted assets | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x249 | boi_RP:x16 | boi_RT:x61 |
| 1.2 | Credit risk (standardized approach)/Minimum capital requirements | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x249 | N/A | boi_RT:x61 |
| 2.1 | Counterparty credit risk (standardized approach)/Risk-weighted assets | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | boi_RP:x16 | boi_RT:x58 |
| 2.2 | Counterparty credit risk (standardized approach)/Minimum capital requirements | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | N/A | boi_RT:x58 |
| 3.1 | Credit valuation adjustment (CVA)/Risk-weighted assets | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | boi_RP:x16 | boi_RT:x4 |
| 3.2 | Credit valuation adjustment (CVA)/Minimum capital requirements | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | N/A | boi_RT:x4 |
| 4.1 | Settlement risk/Risk-weighted assets | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x55 | boi_RP:x16 | boi_RT:x2 |
| 4.2 | Settlement risk/Minimum capital requirements | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x55 | N/A | boi_RT:x2 |
| 5.1 | Securitization exposures (standardized approach)/Risk-weighted assets | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x250 | boi_RP:x16 | boi_RT:x59 |
| 5.2 | Securitization exposures (standardized approach)/Minimum capital requirements | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x250 | N/A | boi_RT:x59 |
| 6.1 | Amounts below deduction thresholds (subject to 250% risk weight)/Risk-weighted assets | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | boi_RP:x16 | boi_RT:x60 |
| 6.2 | Amounts below deduction thresholds (subject to 250% risk weight)/Minimum capital requirements | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | N/A | boi_RT:x60 |
| 7.1 | Total credit risk/Risk-weighted assets | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | boi_RP:x16 | boi_RT:x21 |
| 7.2 | Total credit risk/Minimum capital requirements | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | N/A | boi_RT:x21 |
| 8.1 | Market risk (standardized approach)/Risk-weighted assets | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x57 | boi_RP:x16 | boi_RT:x3 |
| 8.2 | Market risk (standardized approach)/Minimum capital requirements | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | boi_MC:x57 | N/A | boi_RT:x3 |
| 9.1 | Operational risk/Risk-weighted assets | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | boi_RP:x16 | boi_RT:x5 |
| 9.2 | Operational risk/Minimum capital requirements | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | N/A | boi_RT:x5 |
| 10.1 | Total/Risk-weighted assets | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | boi_RP:x16 | N/A |
| 10.2 | Total/Minimum capital requirements | boi_met:mi31 | xbrli:monetaryItemType | instant | boi_BC:x16 | boi_CS:x2 | N/A | N/A | N/A |