| r0.1 | label_boi_a2/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x3 |
| r0.2 | label_boi_a2/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | N/A | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x3 |
| r0.3 | label_boi_a2/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | N/A | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x30 |
| r1.1 | Borrowers activity in Israel/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x3 |
| r1.2 | Borrowers activity in Israel/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x3 |
| r1.3 | Borrowers activity in Israel/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x30 |
| 1.1 | Construction and real estate - construction/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x8 | boi_ST:x3 |
| 1.2 | Construction and real estate - construction/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x8 | boi_ST:x3 |
| 1.3 | Construction and real estate - construction/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x8 | boi_ST:x30 |
| 2.1 | Construction and real estate - real estate activity/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x7 | boi_ST:x3 |
| 2.2 | Construction and real estate - real estate activity/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x7 | boi_ST:x3 |
| 2.3 | Construction and real estate - real estate activity/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x7 | boi_ST:x30 |
| 3.1 | Financial services/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x36 | boi_ST:x3 |
| 3.2 | Financial services/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x36 | boi_ST:x3 |
| 3.3 | Financial services/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x36 | boi_ST:x30 |
| 4.1 | Other - commercial/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x13 | boi_ST:x3 |
| 4.2 | Other - commercial/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x13 | boi_ST:x3 |
| 4.3 | Other - commercial/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x13 | boi_ST:x30 |
| 5.1 | Total commercial/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x4 | boi_ST:x3 |
| 5.2 | Total commercial/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x4 | boi_ST:x3 |
| 5.3 | Total commercial/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x4 | boi_ST:x30 |
| 6.1 | Private individuals - housing loans/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x15 | boi_ST:x3 |
| 6.2 | Private individuals - housing loans/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x15 | boi_ST:x3 |
| 6.3 | Private individuals - housing loans/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x15 | boi_ST:x30 |
| 7.1 | Private individuals - other/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x15 | boi_ST:x3 |
| 7.2 | Private individuals - other/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x15 | boi_ST:x3 |
| 7.3 | Private individuals - other/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x15 | boi_ST:x30 |
| 8.1 | Total public activity in Israel/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x16 | boi_ST:x3 |
| 8.2 | Total public activity in Israel/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x16 | boi_ST:x3 |
| 8.3 | Total public activity in Israel/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x16 | boi_ST:x30 |
| 9.1 | Banks in Israel/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x1 | boi_ST:x3 |
| 9.2 | Banks in Israel/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x1 | boi_ST:x3 |
| 9.3 | Banks in Israel/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x1 | boi_ST:x30 |
| 10.1 | Government of Israel/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x11 | boi_ST:x3 |
| 10.2 | Government of Israel/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x11 | boi_ST:x3 |
| 10.3 | Government of Israel/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x11 | boi_ST:x30 |
| 11.1 | Total activity in Israel/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x3 |
| 11.2 | Total activity in Israel/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x3 |
| 11.3 | Total activity in Israel/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x30 |
| r13.1 | Borrowers activity abroad/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x3 |
| r13.2 | Borrowers activity abroad/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x3 |
| r13.3 | Borrowers activity abroad/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x30 |
| 12.1 | Activity abroad Construction and Real Estate/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x8 | boi_ST:x3 |
| 12.2 | Activity abroad Construction and Real Estate/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x8 | boi_ST:x3 |
| 12.3 | Activity abroad Construction and Real Estate/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x8 | boi_ST:x30 |
| 13.1 | Other - commercial/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x6 | boi_ST:x3 |
| 13.2 | Other - commercial/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x6 | boi_ST:x3 |
| 13.3 | Other - commercial/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x6 | boi_ST:x30 |
| 14.1 | Total commercial/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x4 | boi_ST:x3 |
| 14.2 | Total commercial/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x4 | boi_ST:x3 |
| 14.3 | Total commercial/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x4 | boi_ST:x30 |
| 15.1 | Private individuals/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x15 | boi_ST:x3 |
| 15.2 | Private individuals/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x15 | boi_ST:x3 |
| 15.3 | Private individuals/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x15 | boi_ST:x30 |
| 16.1 | Total public activity abroad/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x16 | boi_ST:x3 |
| 16.2 | Total public activity abroad/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x16 | boi_ST:x3 |
| 16.3 | Total public activity abroad/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x16 | boi_ST:x30 |
| 17.1 | Banks abroad/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x1 | boi_ST:x3 |
| 17.2 | Banks abroad/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x1 | boi_ST:x3 |
| 17.3 | Banks abroad/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x1 | boi_ST:x30 |
| 18.1 | Foreign government/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | boi_SE:x11 | boi_ST:x3 |
| 18.2 | Foreign government/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x11 | boi_ST:x3 |
| 18.3 | Foreign government/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | boi_SE:x11 | boi_ST:x30 |
| 19.1 | Total activity abroad/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x3 |
| 19.2 | Total activity abroad/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x3 |
| 19.3 | Total activity abroad/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x30 |
| 20.1 | Total/Average balance of impaired debts | boi_met:md86 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x3 |
| 20.2 | Total/Written interest income | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | N/A | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x3 |
| 20.3 | Total/of which: written on cash basis | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | N/A | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x25 | N/A | boi_ST:x30 |