| r0.1 | label_boi_a2/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x14 |
| r0.2 | label_boi_a2/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x15 |
| r0.3 | label_boi_a2/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x16 |
| r0.4 | label_boi_a2/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x17 |
| r0.5 | label_boi_a2/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x18 |
| r0.6 | label_boi_a2/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x20 |
| r0.7 | label_boi_a2/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x21 |
| r0.8 | label_boi_a2/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x22 |
| r0.9 | label_boi_a2/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x23 |
| r0.10 | label_boi_a2/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| r0.11 | label_boi_a2/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| r0.12 | label_boi_a2/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | N/A | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 1.1 | Total financial assets/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x948 | boi_PL:x9 | N/A | N/A | boi_TI:x14 |
| 1.2 | Total financial assets/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x948 | boi_PL:x9 | N/A | N/A | boi_TI:x15 |
| 1.3 | Total financial assets/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x948 | boi_PL:x9 | N/A | N/A | boi_TI:x16 |
| 1.4 | Total financial assets/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x948 | boi_PL:x9 | N/A | N/A | boi_TI:x17 |
| 1.5 | Total financial assets/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x948 | boi_PL:x9 | N/A | N/A | boi_TI:x18 |
| 1.6 | Total financial assets/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x948 | boi_PL:x9 | N/A | N/A | boi_TI:x20 |
| 1.7 | Total financial assets/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x948 | boi_PL:x9 | N/A | N/A | boi_TI:x21 |
| 1.8 | Total financial assets/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x948 | boi_PL:x9 | N/A | N/A | boi_TI:x22 |
| 1.9 | Total financial assets/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x948 | boi_PL:x9 | N/A | N/A | boi_TI:x23 |
| 1.10 | Total financial assets/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x948 | boi_PL:x9 | N/A | boi_RP:x24 | N/A |
| 1.11 | Total financial assets/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x948 | boi_PL:x9 | N/A | boi_RP:x24 | N/A |
| 1.12 | Total financial assets/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x948 | boi_PL:x9 | N/A | boi_RP:x24 | N/A |
| 2.1 | Other receivable amounts/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x7 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x14 |
| 2.2 | Other receivable amounts/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x7 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x15 |
| 2.3 | Other receivable amounts/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x7 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x16 |
| 2.4 | Other receivable amounts/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x7 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x17 |
| 2.5 | Other receivable amounts/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x7 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x18 |
| 2.6 | Other receivable amounts/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x7 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x20 |
| 2.7 | Other receivable amounts/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x7 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x21 |
| 2.8 | Other receivable amounts/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x7 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x22 |
| 2.9 | Other receivable amounts/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x7 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x23 |
| 2.10 | Other receivable amounts/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x7 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | boi_RP:x24 | N/A |
| 2.11 | Other receivable amounts/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | boi_BC:x7 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | boi_RP:x24 | N/A |
| 2.12 | Other receivable amounts/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | boi_BC:x7 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | boi_RP:x24 | N/A |
| 3.1 | Total financial liabilities/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x960 | boi_PL:x9 | N/A | N/A | boi_TI:x14 |
| 3.2 | Total financial liabilities/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x960 | boi_PL:x9 | N/A | N/A | boi_TI:x15 |
| 3.3 | Total financial liabilities/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x960 | boi_PL:x9 | N/A | N/A | boi_TI:x16 |
| 3.4 | Total financial liabilities/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x960 | boi_PL:x9 | N/A | N/A | boi_TI:x17 |
| 3.5 | Total financial liabilities/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x960 | boi_PL:x9 | N/A | N/A | boi_TI:x18 |
| 3.6 | Total financial liabilities/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x960 | boi_PL:x9 | N/A | N/A | boi_TI:x20 |
| 3.7 | Total financial liabilities/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x960 | boi_PL:x9 | N/A | N/A | boi_TI:x21 |
| 3.8 | Total financial liabilities/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x960 | boi_PL:x9 | N/A | N/A | boi_TI:x22 |
| 3.9 | Total financial liabilities/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x960 | boi_PL:x9 | N/A | N/A | boi_TI:x23 |
| 3.10 | Total financial liabilities/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x960 | boi_PL:x9 | N/A | boi_RP:x24 | N/A |
| 3.11 | Total financial liabilities/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x960 | boi_PL:x9 | N/A | boi_RP:x24 | N/A |
| 3.12 | Total financial liabilities/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | boi_BC:x2 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | boi_MC:x960 | boi_PL:x9 | N/A | boi_RP:x24 | N/A |
| 4.1 | Other amounts payable/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x14 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x14 |
| 4.2 | Other amounts payable/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x14 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x15 |
| 4.3 | Other amounts payable/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x14 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x16 |
| 4.4 | Other amounts payable/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x14 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x17 |
| 4.5 | Other amounts payable/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x14 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x18 |
| 4.6 | Other amounts payable/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x14 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x20 |
| 4.7 | Other amounts payable/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x14 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x21 |
| 4.8 | Other amounts payable/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x14 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x22 |
| 4.9 | Other amounts payable/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x14 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | N/A | boi_TI:x23 |
| 4.10 | Other amounts payable/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x14 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | boi_RP:x24 | N/A |
| 4.11 | Other amounts payable/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | boi_BC:x14 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | boi_RP:x24 | N/A |
| 4.12 | Other amounts payable/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | boi_BC:x14 | boi_CS:x2 | N/A | boi_EF:x2 | boi_EF:x7 | boi_FN:x1 | boi_MC:x944 | N/A | N/A | boi_RP:x24 | N/A |
| 5.1 | Total exposure to interest rate fluctuations/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x14 |
| 5.2 | Total exposure to interest rate fluctuations/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x15 |
| 5.3 | Total exposure to interest rate fluctuations/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x16 |
| 5.4 | Total exposure to interest rate fluctuations/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x17 |
| 5.5 | Total exposure to interest rate fluctuations/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x18 |
| 5.6 | Total exposure to interest rate fluctuations/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x20 |
| 5.7 | Total exposure to interest rate fluctuations/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x21 |
| 5.8 | Total exposure to interest rate fluctuations/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x22 |
| 5.9 | Total exposure to interest rate fluctuations/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x23 |
| 5.10 | Total exposure to interest rate fluctuations/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 5.11 | Total exposure to interest rate fluctuations/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 5.12 | Total exposure to interest rate fluctuations/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| r6.1 | By nature of the activity/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x14 |
| r6.2 | By nature of the activity/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x15 |
| r6.3 | By nature of the activity/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x16 |
| r6.4 | By nature of the activity/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x17 |
| r6.5 | By nature of the activity/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x18 |
| r6.6 | By nature of the activity/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x20 |
| r6.7 | By nature of the activity/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x21 |
| r6.8 | By nature of the activity/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x22 |
| r6.9 | By nature of the activity/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x23 |
| r6.10 | By nature of the activity/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| r6.11 | By nature of the activity/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| r6.12 | By nature of the activity/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 6.1 | Exposure in the banking portfolio/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x66 | N/A | boi_TI:x14 |
| 6.2 | Exposure in the banking portfolio/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x66 | N/A | boi_TI:x15 |
| 6.3 | Exposure in the banking portfolio/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x66 | N/A | boi_TI:x16 |
| 6.4 | Exposure in the banking portfolio/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x66 | N/A | boi_TI:x17 |
| 6.5 | Exposure in the banking portfolio/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x66 | N/A | boi_TI:x18 |
| 6.6 | Exposure in the banking portfolio/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x66 | N/A | boi_TI:x20 |
| 6.7 | Exposure in the banking portfolio/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x66 | N/A | boi_TI:x21 |
| 6.8 | Exposure in the banking portfolio/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x66 | N/A | boi_TI:x22 |
| 6.9 | Exposure in the banking portfolio/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x66 | N/A | boi_TI:x23 |
| 6.10 | Exposure in the banking portfolio/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x66 | boi_RP:x24 | N/A |
| 6.11 | Exposure in the banking portfolio/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x66 | boi_RP:x24 | N/A |
| 6.12 | Exposure in the banking portfolio/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x66 | boi_RP:x24 | N/A |
| 7.1 | Exposure in the trading portfolio/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x67 | N/A | boi_TI:x14 |
| 7.2 | Exposure in the trading portfolio/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x67 | N/A | boi_TI:x15 |
| 7.3 | Exposure in the trading portfolio/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x67 | N/A | boi_TI:x16 |
| 7.4 | Exposure in the trading portfolio/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x67 | N/A | boi_TI:x17 |
| 7.5 | Exposure in the trading portfolio/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x67 | N/A | boi_TI:x18 |
| 7.6 | Exposure in the trading portfolio/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x67 | N/A | boi_TI:x20 |
| 7.7 | Exposure in the trading portfolio/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x67 | N/A | boi_TI:x21 |
| 7.8 | Exposure in the trading portfolio/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x67 | N/A | boi_TI:x22 |
| 7.9 | Exposure in the trading portfolio/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x67 | N/A | boi_TI:x23 |
| 7.10 | Exposure in the trading portfolio/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x67 | boi_RP:x24 | N/A |
| 7.11 | Exposure in the trading portfolio/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x67 | boi_RP:x24 | N/A |
| 7.12 | Exposure in the trading portfolio/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | boi_PL:x67 | boi_RP:x24 | N/A |
| r9.1 | By indexation base/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x14 |
| r9.2 | By indexation base/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x15 |
| r9.3 | By indexation base/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x16 |
| r9.4 | By indexation base/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x17 |
| r9.5 | By indexation base/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x18 |
| r9.6 | By indexation base/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x20 |
| r9.7 | By indexation base/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x21 |
| r9.8 | By indexation base/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x22 |
| r9.9 | By indexation base/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x23 |
| r9.10 | By indexation base/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| r9.11 | By indexation base/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| r9.12 | By indexation base/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 8.1 | Unindexed Israeli currency/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x14 |
| 8.2 | Unindexed Israeli currency/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x15 |
| 8.3 | Unindexed Israeli currency/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x16 |
| 8.4 | Unindexed Israeli currency/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x17 |
| 8.5 | Unindexed Israeli currency/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x18 |
| 8.6 | Unindexed Israeli currency/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x20 |
| 8.7 | Unindexed Israeli currency/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x21 |
| 8.8 | Unindexed Israeli currency/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x22 |
| 8.9 | Unindexed Israeli currency/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x23 |
| 8.10 | Unindexed Israeli currency/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 8.11 | Unindexed Israeli currency/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 8.12 | Unindexed Israeli currency/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x5 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 9.1 | Israeli currency indexed to CPI/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x14 |
| 9.2 | Israeli currency indexed to CPI/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x15 |
| 9.3 | Israeli currency indexed to CPI/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x16 |
| 9.4 | Israeli currency indexed to CPI/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x17 |
| 9.5 | Israeli currency indexed to CPI/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x18 |
| 9.6 | Israeli currency indexed to CPI/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x20 |
| 9.7 | Israeli currency indexed to CPI/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x21 |
| 9.8 | Israeli currency indexed to CPI/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x22 |
| 9.9 | Israeli currency indexed to CPI/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x23 |
| 9.10 | Israeli currency indexed to CPI/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 9.11 | Israeli currency indexed to CPI/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 9.12 | Israeli currency indexed to CPI/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x6 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 10.1 | Foreign currency (including indexed to foreign currency)/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x15 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x14 |
| 10.2 | Foreign currency (including indexed to foreign currency)/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x15 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x15 |
| 10.3 | Foreign currency (including indexed to foreign currency)/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x15 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x16 |
| 10.4 | Foreign currency (including indexed to foreign currency)/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x15 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x17 |
| 10.5 | Foreign currency (including indexed to foreign currency)/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x15 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x18 |
| 10.6 | Foreign currency (including indexed to foreign currency)/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x15 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x20 |
| 10.7 | Foreign currency (including indexed to foreign currency)/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x15 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x21 |
| 10.8 | Foreign currency (including indexed to foreign currency)/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x15 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x22 |
| 10.9 | Foreign currency (including indexed to foreign currency)/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x15 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x23 |
| 10.10 | Foreign currency (including indexed to foreign currency)/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x15 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 10.11 | Foreign currency (including indexed to foreign currency)/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x15 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 10.12 | Foreign currency (including indexed to foreign currency)/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | boi_BC:x13 | boi_CS:x2 | boi_CU:x15 | boi_EF:x1 | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| r13.1 | Effect on exposure to changes in interest the rates/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x14 |
| r13.2 | Effect on exposure to changes in interest the rates/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x15 |
| r13.3 | Effect on exposure to changes in interest the rates/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x16 |
| r13.4 | Effect on exposure to changes in interest the rates/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x17 |
| r13.5 | Effect on exposure to changes in interest the rates/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x18 |
| r13.6 | Effect on exposure to changes in interest the rates/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x20 |
| r13.7 | Effect on exposure to changes in interest the rates/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x21 |
| r13.8 | Effect on exposure to changes in interest the rates/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x22 |
| r13.9 | Effect on exposure to changes in interest the rates/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x23 |
| r13.10 | Effect on exposure to changes in interest the rates/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| r13.11 | Effect on exposure to changes in interest the rates/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| r13.12 | Effect on exposure to changes in interest the rates/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | N/A | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 11.1 | Effect of liabilities for employee rights/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x5 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x14 |
| 11.2 | Effect of liabilities for employee rights/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x5 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x15 |
| 11.3 | Effect of liabilities for employee rights/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x5 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x16 |
| 11.4 | Effect of liabilities for employee rights/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x5 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x17 |
| 11.5 | Effect of liabilities for employee rights/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x5 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x18 |
| 11.6 | Effect of liabilities for employee rights/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x5 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x20 |
| 11.7 | Effect of liabilities for employee rights/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x5 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x21 |
| 11.8 | Effect of liabilities for employee rights/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x5 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x22 |
| 11.9 | Effect of liabilities for employee rights/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x5 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x23 |
| 11.10 | Effect of liabilities for employee rights/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x5 | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 11.11 | Effect of liabilities for employee rights/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x5 | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 11.12 | Effect of liabilities for employee rights/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x5 | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 12.1 | Effect of spreading out deposits into periods by request/On demand up to one month | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x6 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x14 |
| 12.2 | Effect of spreading out deposits into periods by request/Over one month to three months | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x6 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x15 |
| 12.3 | Effect of spreading out deposits into periods by request/Over three months to one year | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x6 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x16 |
| 12.4 | Effect of spreading out deposits into periods by request/Over one year to three years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x6 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x17 |
| 12.5 | Effect of spreading out deposits into periods by request/Over three years to five years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x6 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x18 |
| 12.6 | Effect of spreading out deposits into periods by request/Over five years to ten years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x6 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x20 |
| 12.7 | Effect of spreading out deposits into periods by request/Over ten years to twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x6 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x21 |
| 12.8 | Effect of spreading out deposits into periods by request/Over twenty years | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x6 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x22 |
| 12.9 | Effect of spreading out deposits into periods by request/Without fixed maturity | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x6 | boi_FN:x1 | N/A | N/A | N/A | N/A | boi_TI:x23 |
| 12.10 | Effect of spreading out deposits into periods by request/Total fair value | boi_met:mi5 | xbrli:monetaryItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x6 | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 12.11 | Effect of spreading out deposits into periods by request/Internal rate of return | boi_met:pi11 | num:percentItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x6 | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |
| 12.12 | Effect of spreading out deposits into periods by request/Average duration | boi_met:ri12 | xbrli:decimalItemType | instant | boi_BC:x13 | boi_CS:x2 | N/A | N/A | boi_EF:x6 | boi_FN:x1 | N/A | N/A | N/A | boi_RP:x24 | N/A |