| 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:x3 | boi_ST:x41 |
| 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:x3 | boi_ST:x41 |
| 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:x3 | boi_ST:x41 |
| 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:x3 | boi_ST:x41 |
| 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:x3 | boi_ST:x41 |
| 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:x3 | boi_ST:x41 |
| 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:x3 | boi_ST:x41 |
| 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:x3 | boi_ST:x41 |
| 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:x8 | boi_ST:x3 | boi_ST:x41 |
| 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:x8 | boi_ST:x3 | boi_ST:x41 |
| 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:x8 | boi_ST:x3 | boi_ST:x41 |
| 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:x8 | boi_ST:x3 | boi_ST:x41 |
| 2.1 | Construction and real estate - real estate activity/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:x7 | boi_ST:x3 | boi_ST:x41 |
| 2.2 | Construction and real estate - real estate activity/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:x7 | boi_ST:x3 | boi_ST:x41 |
| 2.3 | Construction and real estate - real estate activity/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:x7 | boi_ST:x3 | boi_ST:x41 |
| 2.4 | Construction and real estate - real estate activity/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:x7 | boi_ST:x3 | boi_ST:x41 |
| 3.1 | Financial services/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:x36 | boi_ST:x3 | boi_ST:x41 |
| 3.2 | Financial services/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:x36 | boi_ST:x3 | boi_ST:x41 |
| 3.3 | Financial services/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:x36 | boi_ST:x3 | boi_ST:x41 |
| 3.4 | Financial services/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:x36 | boi_ST:x3 | boi_ST:x41 |
| 4.1 | 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:x13 | boi_ST:x3 | boi_ST:x41 |
| 4.2 | 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:x13 | boi_ST:x3 | boi_ST:x41 |
| 4.3 | 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:x13 | boi_ST:x3 | boi_ST:x41 |
| 4.4 | 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:x13 | boi_ST:x3 | boi_ST:x41 |
| 5.1 | 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:x3 | boi_ST:x41 |
| 5.2 | 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:x3 | boi_ST:x41 |
| 5.3 | 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:x3 | boi_ST:x41 |
| 5.4 | 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:x3 | boi_ST:x41 |
| 6.1 | 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:x3 | boi_ST:x41 |
| 6.2 | 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:x3 | boi_ST:x41 |
| 6.3 | 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:x3 | boi_ST:x41 |
| 6.4 | 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:x3 | boi_ST:x41 |
| 7.1 | 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:x3 | boi_ST:x41 |
| 7.2 | 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:x3 | boi_ST:x41 |
| 7.3 | 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:x3 | boi_ST:x41 |
| 7.4 | 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:x3 | boi_ST:x41 |
| 8.1 | 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:x3 | boi_ST:x41 |
| 8.2 | 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:x3 | boi_ST:x41 |
| 8.3 | 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:x3 | boi_ST:x41 |
| 8.4 | 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:x3 | boi_ST:x41 |
| 9.1 | Banks 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:x1 | boi_ST:x3 | boi_ST:x41 |
| 9.2 | Banks 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:x1 | boi_ST:x3 | boi_ST:x41 |
| 9.3 | Banks 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:x1 | boi_ST:x3 | boi_ST:x41 |
| 9.4 | Banks 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:x1 | boi_ST:x3 | boi_ST:x41 |
| 10.1 | Israel Government/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:x11 | boi_ST:x3 | boi_ST:x41 |
| 10.2 | Israel Government/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:x11 | boi_ST:x3 | boi_ST:x41 |
| 10.3 | Israel Government/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:x11 | boi_ST:x3 | boi_ST:x41 |
| 10.4 | Israel Government/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:x11 | boi_ST:x3 | boi_ST:x41 |
| 11.1 | Total 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 | N/A | boi_ST:x3 | boi_ST:x41 |
| 11.2 | Total 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 | N/A | boi_ST:x3 | boi_ST:x41 |
| 11.3 | Total 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 | N/A | boi_ST:x3 | boi_ST:x41 |
| 11.4 | Total 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 | N/A | boi_ST:x3 | boi_ST:x41 |
| r13.1 | Activity of borrowers 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 | N/A | boi_ST:x3 | boi_ST:x41 |
| r13.2 | Activity of borrowers 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 | N/A | boi_ST:x3 | boi_ST:x41 |
| r13.3 | Activity of borrowers 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 | N/A | boi_ST:x3 | boi_ST:x41 |
| r13.4 | Activity of borrowers 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 | N/A | boi_ST:x3 | boi_ST:x41 |
| 12.1 | Construction and real estate - construction/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x8 | boi_ST:x3 | boi_ST:x41 |
| 12.2 | Construction and real estate - construction/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | N/A | boi_RP:x19 | boi_SE:x8 | boi_ST:x3 | boi_ST:x41 |
| 12.3 | Construction and real estate - construction/No. of contracts | boi_met:id102 | xbrli:integerItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x8 | boi_ST:x3 | boi_ST:x41 |
| 12.4 | Construction and real estate - construction/Recorded debt balance | boi_met:md183 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x19 | boi_SE:x8 | boi_ST:x3 | boi_ST:x41 |
| 13.1 | Commercial - other/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:x6 | boi_ST:x3 | boi_ST:x41 |
| 13.2 | Commercial - other/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:x6 | boi_ST:x3 | boi_ST:x41 |
| 13.3 | Commercial - other/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:x6 | boi_ST:x3 | boi_ST:x41 |
| 13.4 | Commercial - other/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:x6 | boi_ST:x3 | boi_ST:x41 |
| 14.1 | Total commercial/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:x4 | boi_ST:x3 | boi_ST:x41 |
| 14.2 | Total commercial/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:x4 | boi_ST:x3 | boi_ST:x41 |
| 14.3 | Total commercial/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:x4 | boi_ST:x3 | boi_ST:x41 |
| 14.4 | Total commercial/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:x4 | boi_ST:x3 | boi_ST:x41 |
| 15.1 | Private individuals/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:x15 | boi_ST:x3 | boi_ST:x41 |
| 15.2 | Private individuals/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:x15 | boi_ST:x3 | boi_ST:x41 |
| 15.3 | Private individuals/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:x15 | boi_ST:x3 | boi_ST:x41 |
| 15.4 | Private individuals/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:x15 | boi_ST:x3 | boi_ST:x41 |
| 16.1 | 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:x3 | boi_ST:x41 |
| 16.2 | 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:x3 | boi_ST:x41 |
| 16.3 | 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:x3 | boi_ST:x41 |
| 16.4 | 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:x3 | boi_ST:x41 |
| 17.1 | Banks 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:x1 | boi_ST:x3 | boi_ST:x41 |
| 17.2 | Banks 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:x1 | boi_ST:x3 | boi_ST:x41 |
| 17.3 | Banks 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:x1 | boi_ST:x3 | boi_ST:x41 |
| 17.4 | Banks 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:x1 | boi_ST:x3 | boi_ST:x41 |
| 18.1 | Foreign governments/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:x11 | boi_ST:x3 | boi_ST:x41 |
| 18.2 | Foreign governments/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:x11 | boi_ST:x3 | boi_ST:x41 |
| 18.3 | Foreign governments/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:x11 | boi_ST:x3 | boi_ST:x41 |
| 18.4 | Foreign governments/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:x11 | boi_ST:x3 | boi_ST:x41 |
| 19.1 | Total 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 | N/A | boi_ST:x3 | boi_ST:x41 |
| 19.2 | Total 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 | N/A | boi_ST:x3 | boi_ST:x41 |
| 19.3 | Total 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 | N/A | boi_ST:x3 | boi_ST:x41 |
| 19.4 | Total 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 | N/A | boi_ST:x3 | boi_ST:x41 |
| 20.1 | 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 | N/A | boi_ST:x3 | boi_ST:x41 |
| 20.2 | 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 | N/A | boi_ST:x3 | boi_ST:x41 |
| 20.3 | 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 | N/A | boi_ST:x3 | boi_ST:x41 |
| 20.4 | 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 | N/A | boi_ST:x3 | boi_ST:x41 |