| r0.1 | label_boi_a2/Not accruing interest income | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | N/A | boi_ST:x212 | boi_ST:x25 | N/A |
| r0.2 | label_boi_a2/Accruing, in arrears of 90 days or more | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | N/A | boi_ST:x215 | boi_ST:x25 | boi_TI:x2 |
| r0.3 | label_boi_a2/Accruing, in arrears of 30 to 89 days | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | N/A | boi_ST:x218 | boi_ST:x25 | boi_TI:x1 |
| r0.4 | label_boi_a2/Accruing | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | N/A | boi_ST:x1 | boi_ST:x25 | boi_TI:x4 |
| r0.5 | label_boi_a2/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | N/A | N/A | boi_ST:x25 | N/A |
| r1.1 | Activity of borrowers in Israel/Not accruing interest income | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | N/A | boi_ST:x212 | boi_ST:x25 | N/A |
| r1.2 | Activity of borrowers in Israel/Accruing, in arrears of 90 days or more | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | N/A | boi_ST:x215 | boi_ST:x25 | boi_TI:x2 |
| r1.3 | Activity of borrowers in Israel/Accruing, in arrears of 30 to 89 days | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | N/A | boi_ST:x218 | boi_ST:x25 | boi_TI:x1 |
| r1.4 | Activity of borrowers in Israel/Accruing | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | N/A | boi_ST:x1 | boi_ST:x25 | boi_TI:x4 |
| r1.5 | Activity of borrowers in Israel/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | N/A | N/A | boi_ST:x25 | N/A |
| 1.1 | Construction and real estate - construction/Not accruing interest income | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x47 | boi_ST:x212 | boi_ST:x25 | N/A |
| 1.2 | Construction and real estate - construction/Accruing, in arrears of 90 days or more | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x47 | boi_ST:x215 | boi_ST:x25 | boi_TI:x2 |
| 1.3 | Construction and real estate - construction/Accruing, in arrears of 30 to 89 days | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x47 | boi_ST:x218 | boi_ST:x25 | boi_TI:x1 |
| 1.4 | Construction and real estate - construction/Accruing | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x47 | boi_ST:x1 | boi_ST:x25 | boi_TI:x4 |
| 1.5 | Construction and real estate - construction/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x47 | N/A | boi_ST:x25 | N/A |
| 2.1 | Commercial - other/Not accruing interest income | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x365 | boi_ST:x212 | boi_ST:x25 | N/A |
| 2.2 | Commercial - other/Accruing, in arrears of 90 days or more | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x365 | boi_ST:x215 | boi_ST:x25 | boi_TI:x2 |
| 2.3 | Commercial - other/Accruing, in arrears of 30 to 89 days | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x365 | boi_ST:x218 | boi_ST:x25 | boi_TI:x1 |
| 2.4 | Commercial - other/Accruing | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x365 | boi_ST:x1 | boi_ST:x25 | boi_TI:x4 |
| 2.5 | Commercial - other/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x365 | N/A | boi_ST:x25 | N/A |
| 3.1 | Total commercial/Not accruing interest income | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x4 | boi_ST:x212 | boi_ST:x25 | N/A |
| 3.2 | Total commercial/Accruing, in arrears of 90 days or more | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x4 | boi_ST:x215 | boi_ST:x25 | boi_TI:x2 |
| 3.3 | Total commercial/Accruing, in arrears of 30 to 89 days | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x4 | boi_ST:x218 | boi_ST:x25 | boi_TI:x1 |
| 3.4 | Total commercial/Accruing | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x4 | boi_ST:x1 | boi_ST:x25 | boi_TI:x4 |
| 3.5 | Total commercial/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x4 | N/A | boi_ST:x25 | N/A |
| 4.1 | Private individuals - housing loans/Not accruing interest income | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x15 | boi_ST:x212 | boi_ST:x25 | N/A |
| 4.2 | Private individuals - housing loans/Accruing, in arrears of 90 days or more | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x15 | boi_ST:x215 | boi_ST:x25 | boi_TI:x2 |
| 4.3 | Private individuals - housing loans/Accruing, in arrears of 30 to 89 days | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x15 | boi_ST:x218 | boi_ST:x25 | boi_TI:x1 |
| 4.4 | Private individuals - housing loans/Accruing | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x15 | boi_ST:x1 | boi_ST:x25 | boi_TI:x4 |
| 4.5 | Private individuals - housing loans/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x15 | N/A | boi_ST:x25 | N/A |
| 5.1 | Private individuals - other/Not accruing interest income | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x15 | boi_ST:x212 | boi_ST:x25 | N/A |
| 5.2 | Private individuals - other/Accruing, in arrears of 90 days or more | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x15 | boi_ST:x215 | boi_ST:x25 | boi_TI:x2 |
| 5.3 | Private individuals - other/Accruing, in arrears of 30 to 89 days | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x15 | boi_ST:x218 | boi_ST:x25 | boi_TI:x1 |
| 5.4 | Private individuals - other/Accruing | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x15 | boi_ST:x1 | boi_ST:x25 | boi_TI:x4 |
| 5.5 | Private individuals - other/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x15 | N/A | boi_ST:x25 | N/A |
| 6.1 | Total public - activity in Israel/Not accruing interest income | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x16 | boi_ST:x212 | boi_ST:x25 | N/A |
| 6.2 | Total public - activity in Israel/Accruing, in arrears of 90 days or more | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x16 | boi_ST:x215 | boi_ST:x25 | boi_TI:x2 |
| 6.3 | Total public - activity in Israel/Accruing, in arrears of 30 to 89 days | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x16 | boi_ST:x218 | boi_ST:x25 | boi_TI:x1 |
| 6.4 | Total public - activity in Israel/Accruing | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x16 | boi_ST:x1 | boi_ST:x25 | boi_TI:x4 |
| 6.5 | Total public - activity in Israel/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_RP:x24 | boi_SE:x16 | N/A | boi_ST:x25 | N/A |
| r8.1 | Activity of borrowers abroad/Not accruing interest income | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | N/A | boi_ST:x212 | boi_ST:x25 | N/A |
| r8.2 | Activity of borrowers abroad/Accruing, in arrears of 90 days or more | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | N/A | boi_ST:x215 | boi_ST:x25 | boi_TI:x2 |
| r8.3 | Activity of borrowers abroad/Accruing, in arrears of 30 to 89 days | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | N/A | boi_ST:x218 | boi_ST:x25 | boi_TI:x1 |
| r8.4 | Activity of borrowers abroad/Accruing | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | N/A | boi_ST:x1 | boi_ST:x25 | boi_TI:x4 |
| r8.5 | Activity of borrowers abroad/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | N/A | N/A | boi_ST:x25 | N/A |
| 7.1 | Total public - activity abroad/Not accruing interest income | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | boi_RP:x24 | boi_SE:x16 | boi_ST:x212 | boi_ST:x25 | N/A |
| 7.2 | Total public - activity abroad/Accruing, in arrears of 90 days or more | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | boi_RP:x24 | boi_SE:x16 | boi_ST:x215 | boi_ST:x25 | boi_TI:x2 |
| 7.3 | Total public - activity abroad/Accruing, in arrears of 30 to 89 days | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | boi_RP:x24 | boi_SE:x16 | boi_ST:x218 | boi_ST:x25 | boi_TI:x1 |
| 7.4 | Total public - activity abroad/Accruing | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | boi_RP:x24 | boi_SE:x16 | boi_ST:x1 | boi_ST:x25 | boi_TI:x4 |
| 7.5 | Total public - activity abroad/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | boi_RP:x24 | boi_SE:x16 | N/A | boi_ST:x25 | N/A |
| 8.1 | Total/Not accruing interest income | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | boi_SE:x16 | boi_ST:x212 | boi_ST:x25 | N/A |
| 8.2 | Total/Accruing, in arrears of 90 days or more | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | boi_SE:x16 | boi_ST:x215 | boi_ST:x25 | boi_TI:x2 |
| 8.3 | Total/Accruing, in arrears of 30 to 89 days | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | boi_SE:x16 | boi_ST:x218 | boi_ST:x25 | boi_TI:x1 |
| 8.4 | Total/Accruing | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | boi_SE:x16 | boi_ST:x1 | boi_ST:x25 | boi_TI:x4 |
| 8.5 | Total/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_RP:x24 | boi_SE:x16 | N/A | boi_ST:x25 | N/A |