| r0.1 | label_boi_a2/Loans for housing | | | | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | N/A |
| r0.2 | label_boi_a2/Other | | | | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | N/A |
| r0.3 | label_boi_a2/Construction | | | | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | N/A |
| r0.4 | label_boi_a2/Real estate | | | | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | N/A |
| r0.5 | label_boi_a2/Financial services | | | | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | N/A |
| r0.6 | label_boi_a2/Other commercial | | | | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | N/A |
| r0.7 | label_boi_a2/Activity abroad - Total | | | | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | N/A |
| r0.8 | label_boi_a2/Total | | | | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | N/A |
| r1.1 | Internal credit rating/Loans for housing | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | N/A |
| r1.2 | Internal credit rating/Other | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | N/A |
| r1.3 | Internal credit rating/Construction | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | N/A |
| r1.4 | Internal credit rating/Real estate | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | N/A |
| r1.5 | Internal credit rating/Financial services | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | N/A |
| r1.6 | Internal credit rating/Other commercial | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | N/A |
| r1.7 | Internal credit rating/Activity abroad - Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | N/A |
| r1.8 | Internal credit rating/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | N/A |
| 1.1 | 1/Loans for housing | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x75 |
| 1.2 | 1/Other | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x75 |
| 1.3 | 1/Construction | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | boi_ST:x75 |
| 1.4 | 1/Real estate | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | boi_ST:x75 |
| 1.5 | 1/Financial services | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | boi_ST:x75 |
| 1.6 | 1/Other commercial | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | boi_ST:x75 |
| 1.7 | 1/Activity abroad - Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | boi_ST:x75 |
| 1.8 | 1/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | boi_ST:x75 |
| 2.1 | 2/Loans for housing | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x76 |
| 2.2 | 2/Other | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x76 |
| 2.3 | 2/Construction | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | boi_ST:x76 |
| 2.4 | 2/Real estate | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | boi_ST:x76 |
| 2.5 | 2/Financial services | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | boi_ST:x76 |
| 2.6 | 2/Other commercial | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | boi_ST:x76 |
| 2.7 | 2/Activity abroad - Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | boi_ST:x76 |
| 2.8 | 2/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | boi_ST:x76 |
| 3.1 | 3/Loans for housing | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x77 |
| 3.2 | 3/Other | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x77 |
| 3.3 | 3/Construction | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | boi_ST:x77 |
| 3.4 | 3/Real estate | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | boi_ST:x77 |
| 3.5 | 3/Financial services | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | boi_ST:x77 |
| 3.6 | 3/Other commercial | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | boi_ST:x77 |
| 3.7 | 3/Activity abroad - Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | boi_ST:x77 |
| 3.8 | 3/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | boi_ST:x77 |
| 4.1 | 4/Loans for housing | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x78 |
| 4.2 | 4/Other | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x78 |
| 4.3 | 4/Construction | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | boi_ST:x78 |
| 4.4 | 4/Real estate | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | boi_ST:x78 |
| 4.5 | 4/Financial services | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | boi_ST:x78 |
| 4.6 | 4/Other commercial | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | boi_ST:x78 |
| 4.7 | 4/Activity abroad - Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | boi_ST:x78 |
| 4.8 | 4/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | boi_ST:x78 |
| 5.1 | 5/Loans for housing | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x79 |
| 5.2 | 5/Other | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x79 |
| 5.3 | 5/Construction | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | boi_ST:x79 |
| 5.4 | 5/Real estate | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | boi_ST:x79 |
| 5.5 | 5/Financial services | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | boi_ST:x79 |
| 5.6 | 5/Other commercial | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | boi_ST:x79 |
| 5.7 | 5/Activity abroad - Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | boi_ST:x79 |
| 5.8 | 5/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | boi_ST:x79 |
| 6.1 | 6/Loans for housing | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x80 |
| 6.2 | 6/Other | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x80 |
| 6.3 | 6/Construction | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | boi_ST:x80 |
| 6.4 | 6/Real estate | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | boi_ST:x80 |
| 6.5 | 6/Financial services | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | boi_ST:x80 |
| 6.6 | 6/Other commercial | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | boi_ST:x80 |
| 6.7 | 6/Activity abroad - Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | boi_ST:x80 |
| 6.8 | 6/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | boi_ST:x80 |
| 7.1 | 7/Loans for housing | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x81 |
| 7.2 | 7/Other | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x81 |
| 7.3 | 7/Construction | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | boi_ST:x81 |
| 7.4 | 7/Real estate | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | boi_ST:x81 |
| 7.5 | 7/Financial services | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | boi_ST:x81 |
| 7.6 | 7/Other commercial | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | boi_ST:x81 |
| 7.7 | 7/Activity abroad - Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | boi_ST:x81 |
| 7.8 | 7/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | boi_ST:x81 |
| 8.1 | 8/Loans for housing | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x82 |
| 8.2 | 8/Other | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x82 |
| 8.3 | 8/Construction | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | boi_ST:x82 |
| 8.4 | 8/Real estate | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | boi_ST:x82 |
| 8.5 | 8/Financial services | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | boi_ST:x82 |
| 8.6 | 8/Other commercial | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | boi_ST:x82 |
| 8.7 | 8/Activity abroad - Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | boi_ST:x82 |
| 8.8 | 8/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | boi_ST:x82 |
| 9.1 | 9/Loans for housing | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x83 |
| 9.2 | 9/Other | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x83 |
| 9.3 | 9/Construction | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | boi_ST:x83 |
| 9.4 | 9/Real estate | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | boi_ST:x83 |
| 9.5 | 9/Financial services | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | boi_ST:x83 |
| 9.6 | 9/Other commercial | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | boi_ST:x83 |
| 9.7 | 9/Activity abroad - Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | boi_ST:x83 |
| 9.8 | 9/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | boi_ST:x83 |
| 10.1 | 10/Loans for housing | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x84 |
| 10.2 | 10/Other | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x84 |
| 10.3 | 10/Construction | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | boi_ST:x84 |
| 10.4 | 10/Real estate | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | boi_ST:x84 |
| 10.5 | 10/Financial services | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | boi_ST:x84 |
| 10.6 | 10/Other commercial | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | boi_ST:x84 |
| 10.7 | 10/Activity abroad - Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | boi_ST:x84 |
| 10.8 | 10/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | boi_ST:x84 |
| 11.1 | Unrated/Loans for housing | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x85 |
| 11.2 | Unrated/Other | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | boi_ST:x85 |
| 11.3 | Unrated/Construction | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | boi_ST:x85 |
| 11.4 | Unrated/Real estate | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | boi_ST:x85 |
| 11.5 | Unrated/Financial services | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | boi_ST:x85 |
| 11.6 | Unrated/Other commercial | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | boi_ST:x85 |
| 11.7 | Unrated/Activity abroad - Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | boi_ST:x85 |
| 11.8 | Unrated/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | boi_ST:x85 |
| 12.1 | Total/Loans for housing | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | N/A |
| 12.2 | Total/Other | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | N/A |
| 12.3 | Total/Construction | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | N/A |
| 12.4 | Total/Real estate | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | N/A |
| 12.5 | Total/Financial services | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | N/A |
| 12.6 | Total/Other commercial | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | N/A |
| 12.7 | Total/Activity abroad - Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | N/A |
| 12.8 | Total/Total | boi_met:mi468 | xbrli:monetaryItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | N/A |
| 13.1 | Weighted average rating/Loans for housing | boi_met:ri516 | xbrli:decimalItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | N/A |
| 13.2 | Weighted average rating/Other | boi_met:ri516 | xbrli:decimalItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | N/A |
| 13.3 | Weighted average rating/Construction | boi_met:ri516 | xbrli:decimalItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | N/A |
| 13.4 | Weighted average rating/Real estate | boi_met:ri516 | xbrli:decimalItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | N/A |
| 13.5 | Weighted average rating/Financial services | boi_met:ri516 | xbrli:decimalItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | N/A |
| 13.6 | Weighted average rating/Other commercial | boi_met:ri516 | xbrli:decimalItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | N/A |
| 13.7 | Weighted average rating/Activity abroad - Total | boi_met:ri516 | xbrli:decimalItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | N/A |
| 13.8 | Weighted average rating/Total | boi_met:ri516 | xbrli:decimalItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | N/A |
| 14.1 | Presentation of ratings/Loans for housing | boi_met:ii517 | xbrli:integerItemType | instant | boi_BC:x28 | boi_CL:x35 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | N/A |
| 14.2 | Presentation of ratings/Other | boi_met:ii517 | xbrli:integerItemType | instant | boi_BC:x28 | boi_CL:x38 | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x15 | N/A |
| 14.3 | Presentation of ratings/Construction | boi_met:ii517 | xbrli:integerItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x8 | N/A |
| 14.4 | Presentation of ratings/Real estate | boi_met:ii517 | xbrli:integerItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x7 | N/A |
| 14.5 | Presentation of ratings/Financial services | boi_met:ii517 | xbrli:integerItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x36 | N/A |
| 14.6 | Presentation of ratings/Other commercial | boi_met:ii517 | xbrli:integerItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x1 | boi_MC:x704 | boi_SE:x279 | N/A |
| 14.7 | Presentation of ratings/Activity abroad - Total | boi_met:ii517 | xbrli:integerItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | boi_GA:x2 | boi_MC:x704 | boi_SE:x16 | N/A |
| 14.8 | Presentation of ratings/Total | boi_met:ii517 | xbrli:integerItemType | instant | boi_BC:x28 | N/A | boi_CS:x1 | N/A | boi_MC:x704 | boi_SE:x16 | N/A |