| r0.1 | label_boi_a2/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | N/A | boi_RP:x19 | N/A | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| r0.2 | label_boi_a2/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | N/A | boi_RP:x19 | N/A | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| r0.3 | label_boi_a2/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | N/A | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| r0.4 | label_boi_a2/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | N/A | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| r1.1 | Activity of borrowers in Israel/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_RP:x19 | N/A | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| r1.2 | Activity of borrowers in Israel/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_RP:x19 | N/A | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| r1.3 | Activity of borrowers in Israel/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | N/A | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| r1.4 | Activity of borrowers in Israel/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | N/A | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 1.1 | Construction and real estate - construction/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x47 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 1.2 | Construction and real estate - construction/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x47 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 1.3 | Construction and real estate - construction/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x47 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 1.4 | Construction and real estate - construction/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x47 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 2.1 | Commercial - other/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x365 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 2.2 | Commercial - other/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x365 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 2.3 | Commercial - other/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x365 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 2.4 | Commercial - other/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x365 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 3.1 | Total commercial/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x4 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 3.2 | Total commercial/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x4 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 3.3 | Total commercial/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x4 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 3.4 | Total commercial/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x4 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 4.1 | Private individuals - housing loans/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x15 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 4.2 | Private individuals - housing loans/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x15 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 4.3 | Private individuals - housing loans/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x15 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 4.4 | Private individuals - housing loans/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x15 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 5.1 | Private individuals - other/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x15 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 5.2 | Private individuals - other/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x15 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 5.3 | Private individuals - other/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x15 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 5.4 | Private individuals - other/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x15 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 6.1 | Total public - activity in Israel/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x16 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 6.2 | Total public - activity in Israel/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x16 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 6.3 | Total public - activity in Israel/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x16 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 6.4 | Total public - activity in Israel/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x16 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| r8.1 | Activity of borrowers abroad/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | N/A | boi_RP:x19 | N/A | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| r8.2 | Activity of borrowers abroad/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | N/A | boi_RP:x19 | N/A | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| r8.3 | Activity of borrowers abroad/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | N/A | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| r8.4 | Activity of borrowers abroad/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | N/A | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 7.1 | Total public - activity abroad/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x16 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 7.2 | Total public - activity abroad/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x16 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 7.3 | Total public - activity abroad/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x16 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 7.4 | Total public - activity abroad/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x16 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 8.1 | Total/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x16 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 8.2 | Total/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x16 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 8.3 | Total/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x16 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |
| 8.4 | Total/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x16 | boi_ST:x2 | boi_ST:x41 | boi_TI:x87 |