| r0.1 | label_boi_a2/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x928 | N/A | boi_RP:x24 | N/A | N/A | N/A |
| r0.2 | label_boi_a2/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x928 | N/A | boi_RP:x24 | N/A | boi_ST:x40 | N/A |
| r0.3 | label_boi_a2/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x928 | N/A | boi_RP:x24 | N/A | N/A | boi_ST:x2 |
| r0.4 | label_boi_a2/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x916 | N/A | boi_RP:x24 | N/A | N/A | N/A |
| r0.5 | label_boi_a2/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x640 | N/A | boi_RP:x24 | N/A | N/A | N/A |
| r0.6 | label_boi_a2/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x916 | N/A | boi_RP:x24 | N/A | N/A | boi_ST:x2 |
| r0.7 | label_boi_a2/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x916 | N/A | boi_RP:x24 | N/A | N/A | boi_ST:x3 |
| r0.8 | label_boi_a2/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | N/A | N/A | N/A |
| r0.9 | label_boi_a2/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | N/A | N/A | N/A |
| r0.10 | label_boi_a2/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x916 | N/A | boi_RP:x24 | N/A | N/A | N/A |
| r1.1 | Activity of borrowers in Israel/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | N/A | N/A | N/A |
| r1.2 | Activity of borrowers in Israel/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | N/A | boi_ST:x40 | N/A |
| r1.3 | Activity of borrowers in Israel/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | N/A | N/A | boi_ST:x2 |
| r1.4 | Activity of borrowers in Israel/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | N/A | N/A | N/A |
| r1.5 | Activity of borrowers in Israel/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | N/A | N/A | N/A |
| r1.6 | Activity of borrowers in Israel/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | N/A | N/A | boi_ST:x2 |
| r1.7 | Activity of borrowers in Israel/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | N/A | N/A | boi_ST:x3 |
| r1.8 | Activity of borrowers in Israel/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | N/A | N/A | N/A |
| r1.9 | Activity of borrowers in Israel/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | N/A | N/A | N/A |
| r1.10 | Activity of borrowers in Israel/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | N/A | N/A | N/A |
| 1.1 | Agriculture/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x29 | N/A | N/A |
| 1.2 | Agriculture/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x29 | boi_ST:x40 | N/A |
| 1.3 | Agriculture/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x29 | N/A | boi_ST:x2 |
| 1.4 | Agriculture/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x29 | N/A | N/A |
| 1.5 | Agriculture/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x29 | N/A | N/A |
| 1.6 | Agriculture/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x29 | N/A | boi_ST:x2 |
| 1.7 | Agriculture/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x29 | N/A | boi_ST:x3 |
| 1.8 | Agriculture/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x29 | N/A | N/A |
| 1.9 | Agriculture/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x29 | N/A | N/A |
| 1.10 | Agriculture/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x29 | N/A | N/A |
| 2.1 | Mining and quarrying/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x288 | N/A | N/A |
| 2.2 | Mining and quarrying/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x288 | boi_ST:x40 | N/A |
| 2.3 | Mining and quarrying/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x288 | N/A | boi_ST:x2 |
| 2.4 | Mining and quarrying/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x288 | N/A | N/A |
| 2.5 | Mining and quarrying/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x288 | N/A | N/A |
| 2.6 | Mining and quarrying/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x288 | N/A | boi_ST:x2 |
| 2.7 | Mining and quarrying/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x288 | N/A | boi_ST:x3 |
| 2.8 | Mining and quarrying/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x288 | N/A | N/A |
| 2.9 | Mining and quarrying/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x288 | N/A | N/A |
| 2.10 | Mining and quarrying/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x288 | N/A | N/A |
| 3.1 | Industry/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x289 | N/A | N/A |
| 3.2 | Industry/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x289 | boi_ST:x40 | N/A |
| 3.3 | Industry/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x289 | N/A | boi_ST:x2 |
| 3.4 | Industry/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x289 | N/A | N/A |
| 3.5 | Industry/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x289 | N/A | N/A |
| 3.6 | Industry/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x289 | N/A | boi_ST:x2 |
| 3.7 | Industry/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x289 | N/A | boi_ST:x3 |
| 3.8 | Industry/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x289 | N/A | N/A |
| 3.9 | Industry/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x289 | N/A | N/A |
| 3.10 | Industry/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x289 | N/A | N/A |
| 4.1 | Construction and real estate-construction/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x8 | N/A | N/A |
| 4.2 | Construction and real estate-construction/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x8 | boi_ST:x40 | N/A |
| 4.3 | Construction and real estate-construction/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x8 | N/A | boi_ST:x2 |
| 4.4 | Construction and real estate-construction/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x8 | N/A | N/A |
| 4.5 | Construction and real estate-construction/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x8 | N/A | N/A |
| 4.6 | Construction and real estate-construction/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x8 | N/A | boi_ST:x2 |
| 4.7 | Construction and real estate-construction/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x8 | N/A | boi_ST:x3 |
| 4.8 | Construction and real estate-construction/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x8 | N/A | N/A |
| 4.9 | Construction and real estate-construction/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x8 | N/A | N/A |
| 4.10 | Construction and real estate-construction/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x8 | N/A | N/A |
| 5.1 | Of which:Housing loans extended to a specific acquisition group/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x79 | N/A | N/A |
| 5.2 | Of which:Housing loans extended to a specific acquisition group/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x79 | boi_ST:x40 | N/A |
| 5.3 | Of which:Housing loans extended to a specific acquisition group/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x79 | N/A | boi_ST:x2 |
| 5.4 | Of which:Housing loans extended to a specific acquisition group/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x79 | N/A | N/A |
| 5.5 | Of which:Housing loans extended to a specific acquisition group/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x79 | N/A | N/A |
| 5.6 | Of which:Housing loans extended to a specific acquisition group/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x79 | N/A | boi_ST:x2 |
| 5.7 | Of which:Housing loans extended to a specific acquisition group/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x79 | N/A | boi_ST:x3 |
| 5.8 | Of which:Housing loans extended to a specific acquisition group/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x79 | N/A | N/A |
| 5.9 | Of which:Housing loans extended to a specific acquisition group/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x79 | N/A | N/A |
| 5.10 | Of which:Housing loans extended to a specific acquisition group/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x79 | N/A | N/A |
| 6.1 | Construction and real estate-real estate activity/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x7 | N/A | N/A |
| 6.2 | Construction and real estate-real estate activity/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x7 | boi_ST:x40 | N/A |
| 6.3 | Construction and real estate-real estate activity/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x7 | N/A | boi_ST:x2 |
| 6.4 | Construction and real estate-real estate activity/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x7 | N/A | N/A |
| 6.5 | Construction and real estate-real estate activity/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x7 | N/A | N/A |
| 6.6 | Construction and real estate-real estate activity/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x7 | N/A | boi_ST:x2 |
| 6.7 | Construction and real estate-real estate activity/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x7 | N/A | boi_ST:x3 |
| 6.8 | Construction and real estate-real estate activity/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x7 | N/A | N/A |
| 6.9 | Construction and real estate-real estate activity/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x7 | N/A | N/A |
| 6.10 | Construction and real estate-real estate activity/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x7 | N/A | N/A |
| 7.1 | Electricity and water/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x31 | N/A | N/A |
| 7.2 | Electricity and water/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x31 | boi_ST:x40 | N/A |
| 7.3 | Electricity and water/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x31 | N/A | boi_ST:x2 |
| 7.4 | Electricity and water/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x31 | N/A | N/A |
| 7.5 | Electricity and water/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x31 | N/A | N/A |
| 7.6 | Electricity and water/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x31 | N/A | boi_ST:x2 |
| 7.7 | Electricity and water/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x31 | N/A | boi_ST:x3 |
| 7.8 | Electricity and water/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x31 | N/A | N/A |
| 7.9 | Electricity and water/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x31 | N/A | N/A |
| 7.10 | Electricity and water/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x31 | N/A | N/A |
| 8.1 | Commerce/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x106 | N/A | N/A |
| 8.2 | Commerce/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x106 | boi_ST:x40 | N/A |
| 8.3 | Commerce/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x106 | N/A | boi_ST:x2 |
| 8.4 | Commerce/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x106 | N/A | N/A |
| 8.5 | Commerce/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x106 | N/A | N/A |
| 8.6 | Commerce/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x106 | N/A | boi_ST:x2 |
| 8.7 | Commerce/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x106 | N/A | boi_ST:x3 |
| 8.8 | Commerce/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x106 | N/A | N/A |
| 8.9 | Commerce/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x106 | N/A | N/A |
| 8.10 | Commerce/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x106 | N/A | N/A |
| 9.1 | Hotels,catering,services and food/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x33 | N/A | N/A |
| 9.2 | Hotels,catering,services and food/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x33 | boi_ST:x40 | N/A |
| 9.3 | Hotels,catering,services and food/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x33 | N/A | boi_ST:x2 |
| 9.4 | Hotels,catering,services and food/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x33 | N/A | N/A |
| 9.5 | Hotels,catering,services and food/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x33 | N/A | N/A |
| 9.6 | Hotels,catering,services and food/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x33 | N/A | boi_ST:x2 |
| 9.7 | Hotels,catering,services and food/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x33 | N/A | boi_ST:x3 |
| 9.8 | Hotels,catering,services and food/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x33 | N/A | N/A |
| 9.9 | Hotels,catering,services and food/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x33 | N/A | N/A |
| 9.10 | Hotels,catering,services and food/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x33 | N/A | N/A |
| 10.1 | Transport and storage/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x34 | N/A | N/A |
| 10.2 | Transport and storage/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x34 | boi_ST:x40 | N/A |
| 10.3 | Transport and storage/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x34 | N/A | boi_ST:x2 |
| 10.4 | Transport and storage/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x34 | N/A | N/A |
| 10.5 | Transport and storage/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x34 | N/A | N/A |
| 10.6 | Transport and storage/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x34 | N/A | boi_ST:x2 |
| 10.7 | Transport and storage/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x34 | N/A | boi_ST:x3 |
| 10.8 | Transport and storage/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x34 | N/A | N/A |
| 10.9 | Transport and storage/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x34 | N/A | N/A |
| 10.10 | Transport and storage/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x34 | N/A | N/A |
| 11.1 | Communications/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x35 | N/A | N/A |
| 11.2 | Communications/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x35 | boi_ST:x40 | N/A |
| 11.3 | Communications/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x35 | N/A | boi_ST:x2 |
| 11.4 | Communications/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x35 | N/A | N/A |
| 11.5 | Communications/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x35 | N/A | N/A |
| 11.6 | Communications/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x35 | N/A | boi_ST:x2 |
| 11.7 | Communications/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x35 | N/A | boi_ST:x3 |
| 11.8 | Communications/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x35 | N/A | N/A |
| 11.9 | Communications/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x35 | N/A | N/A |
| 11.10 | Communications/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x35 | N/A | N/A |
| 12.1 | Financial services/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x36 | N/A | N/A |
| 12.2 | Financial services/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x36 | boi_ST:x40 | N/A |
| 12.3 | Financial services/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x36 | N/A | boi_ST:x2 |
| 12.4 | Financial services/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x36 | N/A | N/A |
| 12.5 | Financial services/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x36 | N/A | N/A |
| 12.6 | Financial services/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x36 | N/A | boi_ST:x2 |
| 12.7 | Financial services/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x36 | N/A | boi_ST:x3 |
| 12.8 | Financial services/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x36 | N/A | N/A |
| 12.9 | Financial services/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x36 | N/A | N/A |
| 12.10 | Financial services/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x36 | N/A | N/A |
| 13.1 | Other business services/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x37 | N/A | N/A |
| 13.2 | Other business services/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x37 | boi_ST:x40 | N/A |
| 13.3 | Other business services/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x37 | N/A | boi_ST:x2 |
| 13.4 | Other business services/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x37 | N/A | N/A |
| 13.5 | Other business services/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x37 | N/A | N/A |
| 13.6 | Other business services/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x37 | N/A | boi_ST:x2 |
| 13.7 | Other business services/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x37 | N/A | boi_ST:x3 |
| 13.8 | Other business services/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x37 | N/A | N/A |
| 13.9 | Other business services/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x37 | N/A | N/A |
| 13.10 | Other business services/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x37 | N/A | N/A |
| 14.1 | Public and community services/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x38 | N/A | N/A |
| 14.2 | Public and community services/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x38 | boi_ST:x40 | N/A |
| 14.3 | Public and community services/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x38 | N/A | boi_ST:x2 |
| 14.4 | Public and community services/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x38 | N/A | N/A |
| 14.5 | Public and community services/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x38 | N/A | N/A |
| 14.6 | Public and community services/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x38 | N/A | boi_ST:x2 |
| 14.7 | Public and community services/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x38 | N/A | boi_ST:x3 |
| 14.8 | Public and community services/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x38 | N/A | N/A |
| 14.9 | Public and community services/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x38 | N/A | N/A |
| 14.10 | Public and community services/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x38 | N/A | N/A |
| 15.1 | Total commercial/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x4 | N/A | N/A |
| 15.2 | Total commercial/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x4 | boi_ST:x40 | N/A |
| 15.3 | Total commercial/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x4 | N/A | boi_ST:x2 |
| 15.4 | Total commercial/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x4 | N/A | N/A |
| 15.5 | Total commercial/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x4 | N/A | N/A |
| 15.6 | Total commercial/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x4 | N/A | boi_ST:x2 |
| 15.7 | Total commercial/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x4 | N/A | boi_ST:x3 |
| 15.8 | Total commercial/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x4 | N/A | N/A |
| 15.9 | Total commercial/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x4 | N/A | N/A |
| 15.10 | Total commercial/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x4 | N/A | N/A |
| 16.1 | Private individuals-housing loans/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 16.2 | Private individuals-housing loans/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x15 | boi_ST:x40 | N/A |
| 16.3 | Private individuals-housing loans/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | boi_ST:x2 |
| 16.4 | Private individuals-housing loans/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 16.5 | Private individuals-housing loans/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 16.6 | Private individuals-housing loans/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | boi_ST:x2 |
| 16.7 | Private individuals-housing loans/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | boi_ST:x3 |
| 16.8 | Private individuals-housing loans/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 16.9 | Private individuals-housing loans/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 16.10 | Private individuals-housing loans/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 17.1 | Private individuals-other/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 17.2 | Private individuals-other/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x15 | boi_ST:x40 | N/A |
| 17.3 | Private individuals-other/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | boi_ST:x2 |
| 17.4 | Private individuals-other/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 17.5 | Private individuals-other/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 17.6 | Private individuals-other/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | boi_ST:x2 |
| 17.7 | Private individuals-other/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | boi_ST:x3 |
| 17.8 | Private individuals-other/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 17.9 | Private individuals-other/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 17.10 | Private individuals-other/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 18.1 | Total public-activity in israel/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x16 | N/A | N/A |
| 18.2 | Total public-activity in israel/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x16 | boi_ST:x40 | N/A |
| 18.3 | Total public-activity in israel/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x16 | N/A | boi_ST:x2 |
| 18.4 | Total public-activity in israel/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x16 | N/A | N/A |
| 18.5 | Total public-activity in israel/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x16 | N/A | N/A |
| 18.6 | Total public-activity in israel/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x16 | N/A | boi_ST:x2 |
| 18.7 | Total public-activity in israel/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x16 | N/A | boi_ST:x3 |
| 18.8 | Total public-activity in israel/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x16 | N/A | N/A |
| 18.9 | Total public-activity in israel/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x16 | N/A | N/A |
| 18.10 | Total public-activity in israel/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x16 | N/A | N/A |
| 19.1 | Israeli banks/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x26 | N/A | N/A |
| 19.2 | Israeli banks/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x26 | boi_ST:x40 | N/A |
| 19.3 | Israeli banks/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x26 | N/A | boi_ST:x2 |
| 19.4 | Israeli banks/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x26 | N/A | N/A |
| 19.5 | Israeli banks/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x26 | N/A | N/A |
| 19.6 | Israeli banks/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x26 | N/A | boi_ST:x2 |
| 19.7 | Israeli banks/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x26 | N/A | boi_ST:x3 |
| 19.8 | Israeli banks/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x26 | N/A | N/A |
| 19.9 | Israeli banks/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x26 | N/A | N/A |
| 19.10 | Israeli banks/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x26 | N/A | N/A |
| 20.1 | Government of israel/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x11 | N/A | N/A |
| 20.2 | Government of israel/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x11 | boi_ST:x40 | N/A |
| 20.3 | Government of israel/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x11 | N/A | boi_ST:x2 |
| 20.4 | Government of israel/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x11 | N/A | N/A |
| 20.5 | Government of israel/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x11 | N/A | N/A |
| 20.6 | Government of israel/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x11 | N/A | boi_ST:x2 |
| 20.7 | Government of israel/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x11 | N/A | boi_ST:x3 |
| 20.8 | Government of israel/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x11 | N/A | N/A |
| 20.9 | Government of israel/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x11 | N/A | N/A |
| 20.10 | Government of israel/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x11 | N/A | N/A |
| 21.1 | Total activity in israel/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 21.2 | Total activity in israel/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x92 | boi_ST:x40 | N/A |
| 21.3 | Total activity in israel/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | boi_ST:x2 |
| 21.4 | Total activity in israel/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 21.5 | Total activity in israel/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 21.6 | Total activity in israel/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | boi_ST:x2 |
| 21.7 | Total activity in israel/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | boi_ST:x3 |
| 21.8 | Total activity in israel/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 21.9 | Total activity in israel/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 21.10 | Total activity in israel/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| r23.1 | Activity of borrowers abroad/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | N/A | N/A | N/A |
| r23.2 | Activity of borrowers abroad/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | N/A | boi_ST:x40 | N/A |
| r23.3 | Activity of borrowers abroad/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | N/A | N/A | boi_ST:x2 |
| r23.4 | Activity of borrowers abroad/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | N/A | N/A | N/A |
| r23.5 | Activity of borrowers abroad/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | N/A | N/A | N/A |
| r23.6 | Activity of borrowers abroad/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | N/A | N/A | boi_ST:x2 |
| r23.7 | Activity of borrowers abroad/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | N/A | N/A | boi_ST:x3 |
| r23.8 | Activity of borrowers abroad/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | N/A | N/A | N/A |
| r23.9 | Activity of borrowers abroad/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | N/A | N/A | N/A |
| r23.10 | Activity of borrowers abroad/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | N/A | N/A | N/A |
| 22.1 | Agriculture/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x29 | N/A | N/A |
| 22.2 | Agriculture/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x29 | boi_ST:x40 | N/A |
| 22.3 | Agriculture/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x29 | N/A | boi_ST:x2 |
| 22.4 | Agriculture/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x29 | N/A | N/A |
| 22.5 | Agriculture/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x29 | N/A | N/A |
| 22.6 | Agriculture/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x29 | N/A | boi_ST:x2 |
| 22.7 | Agriculture/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x29 | N/A | boi_ST:x3 |
| 22.8 | Agriculture/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x29 | N/A | N/A |
| 22.9 | Agriculture/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x29 | N/A | N/A |
| 22.10 | Agriculture/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x29 | N/A | N/A |
| 23.1 | Mining and quarrying/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x288 | N/A | N/A |
| 23.2 | Mining and quarrying/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x288 | boi_ST:x40 | N/A |
| 23.3 | Mining and quarrying/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x288 | N/A | boi_ST:x2 |
| 23.4 | Mining and quarrying/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x288 | N/A | N/A |
| 23.5 | Mining and quarrying/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x288 | N/A | N/A |
| 23.6 | Mining and quarrying/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x288 | N/A | boi_ST:x2 |
| 23.7 | Mining and quarrying/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x288 | N/A | boi_ST:x3 |
| 23.8 | Mining and quarrying/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x288 | N/A | N/A |
| 23.9 | Mining and quarrying/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x288 | N/A | N/A |
| 23.10 | Mining and quarrying/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x288 | N/A | N/A |
| 24.1 | Industry/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x289 | N/A | N/A |
| 24.2 | Industry/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x289 | boi_ST:x40 | N/A |
| 24.3 | Industry/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x289 | N/A | boi_ST:x2 |
| 24.4 | Industry/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x289 | N/A | N/A |
| 24.5 | Industry/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x289 | N/A | N/A |
| 24.6 | Industry/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x289 | N/A | boi_ST:x2 |
| 24.7 | Industry/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x289 | N/A | boi_ST:x3 |
| 24.8 | Industry/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x289 | N/A | N/A |
| 24.9 | Industry/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x289 | N/A | N/A |
| 24.10 | Industry/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x289 | N/A | N/A |
| 25.1 | Construction and real estate-construction/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x47 | N/A | N/A |
| 25.2 | Construction and real estate-construction/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x47 | boi_ST:x40 | N/A |
| 25.3 | Construction and real estate-construction/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x47 | N/A | boi_ST:x2 |
| 25.4 | Construction and real estate-construction/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x47 | N/A | N/A |
| 25.5 | Construction and real estate-construction/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x47 | N/A | N/A |
| 25.6 | Construction and real estate-construction/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x47 | N/A | boi_ST:x2 |
| 25.7 | Construction and real estate-construction/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x47 | N/A | boi_ST:x3 |
| 25.8 | Construction and real estate-construction/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x47 | N/A | N/A |
| 25.9 | Construction and real estate-construction/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x47 | N/A | N/A |
| 25.10 | Construction and real estate-construction/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x47 | N/A | N/A |
| 26.1 | Electricity and water/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x31 | N/A | N/A |
| 26.2 | Electricity and water/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x31 | boi_ST:x40 | N/A |
| 26.3 | Electricity and water/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x31 | N/A | boi_ST:x2 |
| 26.4 | Electricity and water/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x31 | N/A | N/A |
| 26.5 | Electricity and water/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x31 | N/A | N/A |
| 26.6 | Electricity and water/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x31 | N/A | boi_ST:x2 |
| 26.7 | Electricity and water/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x31 | N/A | boi_ST:x3 |
| 26.8 | Electricity and water/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x31 | N/A | N/A |
| 26.9 | Electricity and water/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x31 | N/A | N/A |
| 26.10 | Electricity and water/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x31 | N/A | N/A |
| 27.1 | Commerce/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x106 | N/A | N/A |
| 27.2 | Commerce/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x106 | boi_ST:x40 | N/A |
| 27.3 | Commerce/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x106 | N/A | boi_ST:x2 |
| 27.4 | Commerce/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x106 | N/A | N/A |
| 27.5 | Commerce/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x106 | N/A | N/A |
| 27.6 | Commerce/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x106 | N/A | boi_ST:x2 |
| 27.7 | Commerce/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x106 | N/A | boi_ST:x3 |
| 27.8 | Commerce/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x106 | N/A | N/A |
| 27.9 | Commerce/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x106 | N/A | N/A |
| 27.10 | Commerce/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x106 | N/A | N/A |
| 28.1 | Hotels,catering,services and food/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x33 | N/A | N/A |
| 28.2 | Hotels,catering,services and food/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x33 | boi_ST:x40 | N/A |
| 28.3 | Hotels,catering,services and food/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x33 | N/A | boi_ST:x2 |
| 28.4 | Hotels,catering,services and food/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x33 | N/A | N/A |
| 28.5 | Hotels,catering,services and food/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x33 | N/A | N/A |
| 28.6 | Hotels,catering,services and food/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x33 | N/A | boi_ST:x2 |
| 28.7 | Hotels,catering,services and food/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x33 | N/A | boi_ST:x3 |
| 28.8 | Hotels,catering,services and food/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x33 | N/A | N/A |
| 28.9 | Hotels,catering,services and food/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x33 | N/A | N/A |
| 28.10 | Hotels,catering,services and food/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x33 | N/A | N/A |
| 29.1 | Transport and storage/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x34 | N/A | N/A |
| 29.2 | Transport and storage/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x34 | boi_ST:x40 | N/A |
| 29.3 | Transport and storage/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x34 | N/A | boi_ST:x2 |
| 29.4 | Transport and storage/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x34 | N/A | N/A |
| 29.5 | Transport and storage/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x34 | N/A | N/A |
| 29.6 | Transport and storage/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x34 | N/A | boi_ST:x2 |
| 29.7 | Transport and storage/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x34 | N/A | boi_ST:x3 |
| 29.8 | Transport and storage/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x34 | N/A | N/A |
| 29.9 | Transport and storage/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x34 | N/A | N/A |
| 29.10 | Transport and storage/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x34 | N/A | N/A |
| 30.1 | Communications/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x35 | N/A | N/A |
| 30.2 | Communications/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x35 | boi_ST:x40 | N/A |
| 30.3 | Communications/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x35 | N/A | boi_ST:x2 |
| 30.4 | Communications/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x35 | N/A | N/A |
| 30.5 | Communications/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x35 | N/A | N/A |
| 30.6 | Communications/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x35 | N/A | boi_ST:x2 |
| 30.7 | Communications/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x35 | N/A | boi_ST:x3 |
| 30.8 | Communications/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x35 | N/A | N/A |
| 30.9 | Communications/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x35 | N/A | N/A |
| 30.10 | Communications/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x35 | N/A | N/A |
| 31.1 | Financial services/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x36 | N/A | N/A |
| 31.2 | Financial services/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x36 | boi_ST:x40 | N/A |
| 31.3 | Financial services/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x36 | N/A | boi_ST:x2 |
| 31.4 | Financial services/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x36 | N/A | N/A |
| 31.5 | Financial services/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x36 | N/A | N/A |
| 31.6 | Financial services/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x36 | N/A | boi_ST:x2 |
| 31.7 | Financial services/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x36 | N/A | boi_ST:x3 |
| 31.8 | Financial services/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x36 | N/A | N/A |
| 31.9 | Financial services/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x36 | N/A | N/A |
| 31.10 | Financial services/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x36 | N/A | N/A |
| 32.1 | Other business services/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x37 | N/A | N/A |
| 32.2 | Other business services/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x37 | boi_ST:x40 | N/A |
| 32.3 | Other business services/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x37 | N/A | boi_ST:x2 |
| 32.4 | Other business services/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x37 | N/A | N/A |
| 32.5 | Other business services/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x37 | N/A | N/A |
| 32.6 | Other business services/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x37 | N/A | boi_ST:x2 |
| 32.7 | Other business services/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x37 | N/A | boi_ST:x3 |
| 32.8 | Other business services/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x37 | N/A | N/A |
| 32.9 | Other business services/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x37 | N/A | N/A |
| 32.10 | Other business services/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x37 | N/A | N/A |
| 33.1 | Public and community services/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x38 | N/A | N/A |
| 33.2 | Public and community services/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x38 | boi_ST:x40 | N/A |
| 33.3 | Public and community services/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x38 | N/A | boi_ST:x2 |
| 33.4 | Public and community services/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x38 | N/A | N/A |
| 33.5 | Public and community services/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x38 | N/A | N/A |
| 33.6 | Public and community services/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x38 | N/A | boi_ST:x2 |
| 33.7 | Public and community services/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x38 | N/A | boi_ST:x3 |
| 33.8 | Public and community services/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x38 | N/A | N/A |
| 33.9 | Public and community services/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x38 | N/A | N/A |
| 33.10 | Public and community services/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x38 | N/A | N/A |
| 34.1 | Total commercial/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x4 | N/A | N/A |
| 34.2 | Total commercial/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x4 | boi_ST:x40 | N/A |
| 34.3 | Total commercial/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x4 | N/A | boi_ST:x2 |
| 34.4 | Total commercial/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x4 | N/A | N/A |
| 34.5 | Total commercial/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x4 | N/A | N/A |
| 34.6 | Total commercial/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x4 | N/A | boi_ST:x2 |
| 34.7 | Total commercial/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x4 | N/A | boi_ST:x3 |
| 34.8 | Total commercial/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x4 | N/A | N/A |
| 34.9 | Total commercial/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x4 | N/A | N/A |
| 34.10 | Total commercial/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x4 | N/A | N/A |
| 35.1 | Private individuals-housing loans/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 35.2 | Private individuals-housing loans/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x15 | boi_ST:x40 | N/A |
| 35.3 | Private individuals-housing loans/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | boi_ST:x2 |
| 35.4 | Private individuals-housing loans/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 35.5 | Private individuals-housing loans/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x35 | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 35.6 | Private individuals-housing loans/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | boi_ST:x2 |
| 35.7 | Private individuals-housing loans/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | boi_ST:x3 |
| 35.8 | Private individuals-housing loans/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 35.9 | Private individuals-housing loans/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 35.10 | Private individuals-housing loans/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 36.1 | Private individuals-other/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 36.2 | Private individuals-other/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x15 | boi_ST:x40 | N/A |
| 36.3 | Private individuals-other/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | boi_ST:x2 |
| 36.4 | Private individuals-other/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 36.5 | Private individuals-other/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CL:x38 | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 36.6 | Private individuals-other/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | boi_ST:x2 |
| 36.7 | Private individuals-other/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | boi_ST:x3 |
| 36.8 | Private individuals-other/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 36.9 | Private individuals-other/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 36.10 | Private individuals-other/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x15 | N/A | N/A |
| 37.1 | Total public-activity in abroad/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x16 | N/A | N/A |
| 37.2 | Total public-activity in abroad/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x16 | boi_ST:x40 | N/A |
| 37.3 | Total public-activity in abroad/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x16 | N/A | boi_ST:x2 |
| 37.4 | Total public-activity in abroad/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x16 | N/A | N/A |
| 37.5 | Total public-activity in abroad/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x16 | N/A | N/A |
| 37.6 | Total public-activity in abroad/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x16 | N/A | boi_ST:x2 |
| 37.7 | Total public-activity in abroad/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x16 | N/A | boi_ST:x3 |
| 37.8 | Total public-activity in abroad/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x16 | N/A | N/A |
| 37.9 | Total public-activity in abroad/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x16 | N/A | N/A |
| 37.10 | Total public-activity in abroad/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x16 | N/A | N/A |
| 38.1 | Foreign banks/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x26 | N/A | N/A |
| 38.2 | Foreign banks/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x26 | boi_ST:x40 | N/A |
| 38.3 | Foreign banks/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x26 | N/A | boi_ST:x2 |
| 38.4 | Foreign banks/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x26 | N/A | N/A |
| 38.5 | Foreign banks/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x26 | N/A | N/A |
| 38.6 | Foreign banks/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x26 | N/A | boi_ST:x2 |
| 38.7 | Foreign banks/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x26 | N/A | boi_ST:x3 |
| 38.8 | Foreign banks/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x26 | N/A | N/A |
| 38.9 | Foreign banks/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x26 | N/A | N/A |
| 38.10 | Foreign banks/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x26 | N/A | N/A |
| 39.1 | Foreign Governments/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x11 | N/A | N/A |
| 39.2 | Foreign Governments/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x11 | boi_ST:x40 | N/A |
| 39.3 | Foreign Governments/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x11 | N/A | boi_ST:x2 |
| 39.4 | Foreign Governments/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x11 | N/A | N/A |
| 39.5 | Foreign Governments/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x11 | N/A | N/A |
| 39.6 | Foreign Governments/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x11 | N/A | boi_ST:x2 |
| 39.7 | Foreign Governments/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x11 | N/A | boi_ST:x3 |
| 39.8 | Foreign Governments/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x11 | N/A | N/A |
| 39.9 | Foreign Governments/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x11 | N/A | N/A |
| 39.10 | Foreign Governments/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x11 | N/A | N/A |
| 40.1 | Total activity abroad/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 40.2 | Total activity abroad/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x92 | boi_ST:x40 | N/A |
| 40.3 | Total activity abroad/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | boi_ST:x2 |
| 40.4 | Total activity abroad/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 40.5 | Total activity abroad/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 40.6 | Total activity abroad/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | boi_ST:x2 |
| 40.7 | Total activity abroad/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | boi_ST:x3 |
| 40.8 | Total activity abroad/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 40.9 | Total activity abroad/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 40.10 | Total activity abroad/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | boi_GA:x2 | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 41.1 | Total/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 41.2 | Total/Credit performance rating | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x92 | boi_ST:x40 | N/A |
| 41.3 | Total/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x928 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | boi_ST:x2 |
| 41.4 | Total/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 41.5 | Total/Of which: Debts | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | N/A | boi_MC:x640 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 41.6 | Total/Problematic | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | boi_ST:x2 |
| 41.7 | Total/Impaired | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | boi_ST:x3 |
| 41.8 | Total/Expenses in respect of credit losses | boi_met:md191 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 41.9 | Total/Net accounting write-offs | boi_met:md285 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x916 | boi_MU:x1 | boi_RP:x24 | boi_SE:x92 | N/A | N/A |
| 41.10 | Total/Balance of allowance for credit losses | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x2 | N/A | boi_MC:x916 | N/A | boi_RP:x24 | boi_SE:x92 | N/A | N/A |