| r0.1 | label_boi_a2/Average balance of impaired debts 2 | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_RP:x19 | N/A | boi_ST:x3 |
| r1.1 | Debts not guaranteed by banks/Average balance of impaired debts 2 | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x2 | boi_CS:x2 | N/A | boi_RP:x19 | N/A | boi_ST:x3 |
| r2.1 | Private individuals/Average balance of impaired debts 2 | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x2 | boi_CS:x2 | N/A | boi_RP:x19 | boi_SE:x15 | boi_ST:x3 |
| 1.1 | Receivables in respect of credit cards/Average balance of impaired debts 2 | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x2 | boi_CS:x2 | boi_MC:x143 | boi_RP:x19 | boi_SE:x15 | boi_ST:x3 |
| 2.1 | Credit 4/Average balance of impaired debts 2 | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x2 | boi_CS:x2 | boi_MC:x880 | boi_RP:x19 | boi_SE:x15 | boi_ST:x3 |
| r5.1 | Commercial/Average balance of impaired debts 2 | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x2 | boi_CS:x2 | N/A | boi_RP:x19 | boi_SE:x4 | boi_ST:x3 |
| 3.1 | Receivables in respect of credit cards/Average balance of impaired debts 2 | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x2 | boi_CS:x2 | boi_MC:x143 | boi_RP:x19 | boi_SE:x4 | boi_ST:x3 |
| 4.1 | Credit 5/Average balance of impaired debts 2 | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x2 | boi_CS:x2 | boi_MC:x880 | boi_RP:x19 | boi_SE:x4 | boi_ST:x3 |
| 5.1 | Total debts not guaranteed by banks/Average balance of impaired debts 2 | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x2 | boi_CS:x2 | boi_MC:x8 | boi_RP:x19 | N/A | boi_ST:x3 |
| 6.1 | Debts guaranteed by banks and others 6/Average balance of impaired debts 2 | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x40 | boi_CS:x2 | boi_MC:x8 | boi_RP:x19 | N/A | boi_ST:x3 |
| 7.1 | Total/Average balance of impaired debts 2 | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x8 | boi_RP:x19 | N/A | boi_ST:x3 |