| r0.1 | label_boi_a2/Construction and real estate | | | | N/A | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| r0.2 | label_boi_a2/Other | | | | N/A | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| r0.3 | label_boi_a2/Total micro business | | | | N/A | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| r0.4 | label_boi_a2/Construction and real estate | | | | N/A | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| r0.5 | label_boi_a2/Other | | | | N/A | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| r0.6 | label_boi_a2/Total Medium business | | | | N/A | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| r0.7 | label_boi_a2/Construction and real estate | | | | N/A | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| r0.8 | label_boi_a2/Other | | | | N/A | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| r0.9 | label_boi_a2/Total Large business | | | | N/A | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| r0.10 | label_boi_a2/Total | | | | N/A | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 1.1 | Interest income from outside segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | boi_SE:x44 | N/A | N/A |
| 1.2 | Interest income from outside segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | boi_SE:x44 | N/A | N/A |
| 1.3 | Interest income from outside segment/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | boi_SE:x44 | N/A | N/A |
| 1.4 | Interest income from outside segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | boi_SE:x44 | N/A | N/A |
| 1.5 | Interest income from outside segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | boi_SE:x44 | N/A | N/A |
| 1.6 | Interest income from outside segment/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | boi_SE:x44 | N/A | N/A |
| 1.7 | Interest income from outside segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | boi_SE:x44 | N/A | N/A |
| 1.8 | Interest income from outside segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | boi_SE:x44 | N/A | N/A |
| 1.9 | Interest income from outside segment/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | boi_SE:x44 | N/A | N/A |
| 1.10 | Interest income from outside segment/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | boi_SE:x44 | N/A | N/A |
| 2.1 | Interest expenditure to outside segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | boi_SE:x44 | N/A | N/A |
| 2.2 | Interest expenditure to outside segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | boi_SE:x44 | N/A | N/A |
| 2.3 | Interest expenditure to outside segment/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | boi_SE:x44 | N/A | N/A |
| 2.4 | Interest expenditure to outside segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | boi_SE:x44 | N/A | N/A |
| 2.5 | Interest expenditure to outside segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | boi_SE:x44 | N/A | N/A |
| 2.6 | Interest expenditure to outside segment/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | boi_SE:x44 | N/A | N/A |
| 2.7 | Interest expenditure to outside segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | boi_SE:x44 | N/A | N/A |
| 2.8 | Interest expenditure to outside segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | boi_SE:x44 | N/A | N/A |
| 2.9 | Interest expenditure to outside segment/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | boi_SE:x44 | N/A | N/A |
| 2.10 | Interest expenditure to outside segment/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | boi_SE:x44 | N/A | N/A |
| r3.1 | Interest income, net:/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| r3.2 | Interest income, net:/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| r3.3 | Interest income, net:/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| r3.4 | Interest income, net:/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| r3.5 | Interest income, net:/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| r3.6 | Interest income, net:/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| r3.7 | Interest income, net:/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| r3.8 | Interest income, net:/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| r3.9 | Interest income, net:/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| r3.10 | Interest income, net:/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 3.1 | From outside segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | boi_SE:x44 | N/A | N/A |
| 3.2 | From outside segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | boi_SE:x44 | N/A | N/A |
| 3.3 | From outside segment/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | boi_SE:x44 | N/A | N/A |
| 3.4 | From outside segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | boi_SE:x44 | N/A | N/A |
| 3.5 | From outside segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | boi_SE:x44 | N/A | N/A |
| 3.6 | From outside segment/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | boi_SE:x44 | N/A | N/A |
| 3.7 | From outside segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | boi_SE:x44 | N/A | N/A |
| 3.8 | From outside segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | boi_SE:x44 | N/A | N/A |
| 3.9 | From outside segment/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | boi_SE:x44 | N/A | N/A |
| 3.10 | From outside segment/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | boi_SE:x44 | N/A | N/A |
| 4.1 | From within segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | boi_SE:x45 | N/A | N/A |
| 4.2 | From within segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | boi_SE:x45 | N/A | N/A |
| 4.3 | From within segment/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | boi_SE:x45 | N/A | N/A |
| 4.4 | From within segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | boi_SE:x45 | N/A | N/A |
| 4.5 | From within segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | boi_SE:x45 | N/A | N/A |
| 4.6 | From within segment/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | boi_SE:x45 | N/A | N/A |
| 4.7 | From within segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | boi_SE:x45 | N/A | N/A |
| 4.8 | From within segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | boi_SE:x45 | N/A | N/A |
| 4.9 | From within segment/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | boi_SE:x45 | N/A | N/A |
| 4.10 | From within segment/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | boi_SE:x45 | N/A | N/A |
| 5.1 | Total interest income, net/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 5.2 | Total interest income, net/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 5.3 | Total interest income, net/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 5.4 | Total interest income, net/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 5.5 | Total interest income, net/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 5.6 | Total interest income, net/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 5.7 | Total interest income, net/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 5.8 | Total interest income, net/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 5.9 | Total interest income, net/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 5.10 | Total interest income, net/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| r7.1 | Non-interest income:/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| r7.2 | Non-interest income:/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| r7.3 | Non-interest income:/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| r7.4 | Non-interest income:/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| r7.5 | Non-interest income:/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| r7.6 | Non-interest income:/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| r7.7 | Non-interest income:/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| r7.8 | Non-interest income:/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| r7.9 | Non-interest income:/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| r7.10 | Non-interest income:/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 6.1 | From outside segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | boi_SE:x44 | N/A | N/A |
| 6.2 | From outside segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | boi_SE:x44 | N/A | N/A |
| 6.3 | From outside segment/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | boi_SE:x44 | N/A | N/A |
| 6.4 | From outside segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | boi_SE:x44 | N/A | N/A |
| 6.5 | From outside segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | boi_SE:x44 | N/A | N/A |
| 6.6 | From outside segment/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | boi_SE:x44 | N/A | N/A |
| 6.7 | From outside segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | boi_SE:x44 | N/A | N/A |
| 6.8 | From outside segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | boi_SE:x44 | N/A | N/A |
| 6.9 | From outside segment/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | boi_SE:x44 | N/A | N/A |
| 6.10 | From outside segment/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | boi_SE:x44 | N/A | N/A |
| 7.1 | From within segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | boi_SE:x45 | N/A | N/A |
| 7.2 | From within segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | boi_SE:x45 | N/A | N/A |
| 7.3 | From within segment/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | boi_SE:x45 | N/A | N/A |
| 7.4 | From within segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | boi_SE:x45 | N/A | N/A |
| 7.5 | From within segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | boi_SE:x45 | N/A | N/A |
| 7.6 | From within segment/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | boi_SE:x45 | N/A | N/A |
| 7.7 | From within segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | boi_SE:x45 | N/A | N/A |
| 7.8 | From within segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | boi_SE:x45 | N/A | N/A |
| 7.9 | From within segment/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | boi_SE:x45 | N/A | N/A |
| 7.10 | From within segment/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | boi_SE:x45 | N/A | N/A |
| 8.1 | Total non-interest income/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 8.2 | Total non-interest income/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 8.3 | Total non-interest income/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 8.4 | Total non-interest income/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 8.5 | Total non-interest income/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 8.6 | Total non-interest income/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 8.7 | Total non-interest income/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 8.8 | Total non-interest income/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 8.9 | Total non-interest income/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 8.10 | Total non-interest income/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x127 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 9.1 | Of which: income from credit cards/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x281 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 9.2 | Of which: income from credit cards/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x281 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 9.3 | Of which: income from credit cards/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x281 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 9.4 | Of which: income from credit cards/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x281 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 9.5 | Of which: income from credit cards/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x281 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 9.6 | Of which: income from credit cards/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x281 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 9.7 | Of which: income from credit cards/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x281 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 9.8 | Of which: income from credit cards/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x281 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 9.9 | Of which: income from credit cards/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x281 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 9.10 | Of which: income from credit cards/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x281 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 10.1 | Total income/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x455 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 10.2 | Total income/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x455 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 10.3 | Total income/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x455 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 10.4 | Total income/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x455 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 10.5 | Total income/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x455 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 10.6 | Total income/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x455 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 10.7 | Total income/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x455 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 10.8 | Total income/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x455 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 10.9 | Total income/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x455 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 10.10 | Total income/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x455 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 11.1 | Credit-loss expenditure/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x126 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 11.2 | Credit-loss expenditure/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x126 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 11.3 | Credit-loss expenditure/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x126 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 11.4 | Credit-loss expenditure/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x126 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 11.5 | Credit-loss expenditure/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x126 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 11.6 | Credit-loss expenditure/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x126 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 11.7 | Credit-loss expenditure/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x126 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 11.8 | Credit-loss expenditure/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x126 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 11.9 | Credit-loss expenditure/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x126 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 11.10 | Credit-loss expenditure/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x126 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| r14.1 | Operating and other expenses/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| r14.2 | Operating and other expenses/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| r14.3 | Operating and other expenses/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| r14.4 | Operating and other expenses/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| r14.5 | Operating and other expenses/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| r14.6 | Operating and other expenses/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| r14.7 | Operating and other expenses/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| r14.8 | Operating and other expenses/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| r14.9 | Operating and other expenses/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| r14.10 | Operating and other expenses/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 12.1 | To outside segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | boi_SE:x44 | N/A | N/A |
| 12.2 | To outside segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | boi_SE:x44 | N/A | N/A |
| 12.3 | To outside segment/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | boi_SE:x44 | N/A | N/A |
| 12.4 | To outside segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | boi_SE:x44 | N/A | N/A |
| 12.5 | To outside segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | boi_SE:x44 | N/A | N/A |
| 12.6 | To outside segment/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | boi_SE:x44 | N/A | N/A |
| 12.7 | To outside segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | boi_SE:x44 | N/A | N/A |
| 12.8 | To outside segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | boi_SE:x44 | N/A | N/A |
| 12.9 | To outside segment/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | boi_SE:x44 | N/A | N/A |
| 12.10 | To outside segment/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | boi_SE:x44 | N/A | N/A |
| 13.1 | To within segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | boi_SE:x45 | N/A | N/A |
| 13.2 | To within segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | boi_SE:x45 | N/A | N/A |
| 13.3 | To within segment/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | boi_SE:x45 | N/A | N/A |
| 13.4 | To within segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | boi_SE:x45 | N/A | N/A |
| 13.5 | To within segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | boi_SE:x45 | N/A | N/A |
| 13.6 | To within segment/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | boi_SE:x45 | N/A | N/A |
| 13.7 | To within segment/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | boi_SE:x45 | N/A | N/A |
| 13.8 | To within segment/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | boi_SE:x45 | N/A | N/A |
| 13.9 | To within segment/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | boi_SE:x45 | N/A | N/A |
| 13.10 | To within segment/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | boi_SE:x45 | N/A | N/A |
| 14.1 | Total operating and other expenses/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 14.2 | Total operating and other expenses/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 14.3 | Total operating and other expenses/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 14.4 | Total operating and other expenses/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 14.5 | Total operating and other expenses/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 14.6 | Total operating and other expenses/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 14.7 | Total operating and other expenses/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 14.8 | Total operating and other expenses/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 14.9 | Total operating and other expenses/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 14.10 | Total operating and other expenses/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x160 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 15.1 | Pre-tax profit/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x123 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 15.2 | Pre-tax profit/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x123 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 15.3 | Pre-tax profit/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x123 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 15.4 | Pre-tax profit/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x123 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 15.5 | Pre-tax profit/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x123 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 15.6 | Pre-tax profit/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x123 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 15.7 | Pre-tax profit/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x123 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 15.8 | Pre-tax profit/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x123 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 15.9 | Pre-tax profit/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x123 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 15.10 | Pre-tax profit/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x123 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 16.1 | Provision for taxes on profit/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x190 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 16.2 | Provision for taxes on profit/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x190 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 16.3 | Provision for taxes on profit/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x190 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 16.4 | Provision for taxes on profit/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x190 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 16.5 | Provision for taxes on profit/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x190 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 16.6 | Provision for taxes on profit/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x190 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 16.7 | Provision for taxes on profit/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x190 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 16.8 | Provision for taxes on profit/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x190 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 16.9 | Provision for taxes on profit/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x190 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 16.10 | Provision for taxes on profit/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x190 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 17.1 | Post-tax profit/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x122 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 17.2 | Post-tax profit/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x122 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 17.3 | Post-tax profit/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x122 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 17.4 | Post-tax profit/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x122 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 17.5 | Post-tax profit/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x122 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 17.6 | Post-tax profit/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x122 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 17.7 | Post-tax profit/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x122 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 17.8 | Post-tax profit/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x122 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 17.9 | Post-tax profit/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x122 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 17.10 | Post-tax profit/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x122 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 18.1 | Share of banking corp. in profits of included companies/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x191 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 18.2 | Share of banking corp. in profits of included companies/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x191 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 18.3 | Share of banking corp. in profits of included companies/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x191 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 18.4 | Share of banking corp. in profits of included companies/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x191 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 18.5 | Share of banking corp. in profits of included companies/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x191 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 18.6 | Share of banking corp. in profits of included companies/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x191 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 18.7 | Share of banking corp. in profits of included companies/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x191 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 18.8 | Share of banking corp. in profits of included companies/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x191 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 18.9 | Share of banking corp. in profits of included companies/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x191 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 18.10 | Share of banking corp. in profits of included companies/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x191 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 19.1 | Net profit before attribution to holders of rights that do not confer control/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 19.2 | Net profit before attribution to holders of rights that do not confer control/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 19.3 | Net profit before attribution to holders of rights that do not confer control/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 19.4 | Net profit before attribution to holders of rights that do not confer control/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 19.5 | Net profit before attribution to holders of rights that do not confer control/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 19.6 | Net profit before attribution to holders of rights that do not confer control/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 19.7 | Net profit before attribution to holders of rights that do not confer control/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 19.8 | Net profit before attribution to holders of rights that do not confer control/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 19.9 | Net profit before attribution to holders of rights that do not confer control/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 19.10 | Net profit before attribution to holders of rights that do not confer control/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 20.1 | Net profit attributed to holders of rights that do not confer control/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 20.2 | Net profit attributed to holders of rights that do not confer control/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 20.3 | Net profit attributed to holders of rights that do not confer control/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 20.4 | Net profit attributed to holders of rights that do not confer control/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 20.5 | Net profit attributed to holders of rights that do not confer control/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 20.6 | Net profit attributed to holders of rights that do not confer control/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 20.7 | Net profit attributed to holders of rights that do not confer control/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 20.8 | Net profit attributed to holders of rights that do not confer control/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 20.9 | Net profit attributed to holders of rights that do not confer control/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 20.10 | Net profit attributed to holders of rights that do not confer control/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 21.1 | Net profit attributed to shareholders in banking corp./Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 21.2 | Net profit attributed to shareholders in banking corp./Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 21.3 | Net profit attributed to shareholders in banking corp./Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 21.4 | Net profit attributed to shareholders in banking corp./Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 21.5 | Net profit attributed to shareholders in banking corp./Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 21.6 | Net profit attributed to shareholders in banking corp./Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 21.7 | Net profit attributed to shareholders in banking corp./Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 21.8 | Net profit attributed to shareholders in banking corp./Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 21.9 | Net profit attributed to shareholders in banking corp./Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 21.10 | Net profit attributed to shareholders in banking corp./Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_GA:x1 | boi_MC:x121 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 22.1 | Avg. asset balance/Construction and real estate | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x1 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 22.2 | Avg. asset balance/Other | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x1 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 22.3 | Avg. asset balance/Total micro business | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x1 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 22.4 | Avg. asset balance/Construction and real estate | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x1 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 22.5 | Avg. asset balance/Other | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x1 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 22.6 | Avg. asset balance/Total Medium business | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x1 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 22.7 | Avg. asset balance/Construction and real estate | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x1 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 22.8 | Avg. asset balance/Other | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x1 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 22.9 | Avg. asset balance/Total Large business | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x1 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 22.10 | Avg. asset balance/Total | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x1 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 23.1 | Of which: Investments in included companies/Construction and real estate | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x54 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 23.2 | Of which: Investments in included companies/Other | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x54 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 23.3 | Of which: Investments in included companies/Total micro business | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x54 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 23.4 | Of which: Investments in included companies/Construction and real estate | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x54 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 23.5 | Of which: Investments in included companies/Other | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x54 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 23.6 | Of which: Investments in included companies/Total Medium business | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x54 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 23.7 | Of which: Investments in included companies/Construction and real estate | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x54 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 23.8 | Of which: Investments in included companies/Other | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x54 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 23.9 | Of which: Investments in included companies/Total Large business | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x54 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 23.10 | Of which: Investments in included companies/Total | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x54 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 24.1 | Of which: Avg. balance of credit to public/Construction and real estate | boi_met:md1065 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 24.2 | Of which: Avg. balance of credit to public/Other | boi_met:md1065 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 24.3 | Of which: Avg. balance of credit to public/Total micro business | boi_met:md1065 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 24.4 | Of which: Avg. balance of credit to public/Construction and real estate | boi_met:md1065 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 24.5 | Of which: Avg. balance of credit to public/Other | boi_met:md1065 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 24.6 | Of which: Avg. balance of credit to public/Total Medium business | boi_met:md1065 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 24.7 | Of which: Avg. balance of credit to public/Construction and real estate | boi_met:md1065 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 24.8 | Of which: Avg. balance of credit to public/Other | boi_met:md1065 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 24.9 | Of which: Avg. balance of credit to public/Total Large business | boi_met:md1065 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 24.10 | Of which: Avg. balance of credit to public/Total | boi_met:md1065 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 25.1 | Outstanding credit to public at end of reporting period/Construction and real estate | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 25.2 | Outstanding credit to public at end of reporting period/Other | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 25.3 | Outstanding credit to public at end of reporting period/Total micro business | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 25.4 | Outstanding credit to public at end of reporting period/Construction and real estate | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 25.5 | Outstanding credit to public at end of reporting period/Other | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 25.6 | Outstanding credit to public at end of reporting period/Total Medium business | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 25.7 | Outstanding credit to public at end of reporting period/Construction and real estate | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 25.8 | Outstanding credit to public at end of reporting period/Other | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 25.9 | Outstanding credit to public at end of reporting period/Total Large business | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 25.10 | Outstanding credit to public at end of reporting period/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 26.1 | Outstanding impaired debts/Construction and real estate | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | boi_ST:x3 | N/A |
| 26.2 | Outstanding impaired debts/Other | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | boi_ST:x3 | N/A |
| 26.3 | Outstanding impaired debts/Total micro business | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x313 | N/A | N/A | boi_ST:x3 | N/A |
| 26.4 | Outstanding impaired debts/Construction and real estate | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | boi_ST:x3 | N/A |
| 26.5 | Outstanding impaired debts/Other | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | boi_ST:x3 | N/A |
| 26.6 | Outstanding impaired debts/Total Medium business | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x310 | N/A | N/A | boi_ST:x3 | N/A |
| 26.7 | Outstanding impaired debts/Construction and real estate | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | boi_ST:x3 | N/A |
| 26.8 | Outstanding impaired debts/Other | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | boi_ST:x3 | N/A |
| 26.9 | Outstanding impaired debts/Total Large business | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x309 | N/A | N/A | boi_ST:x3 | N/A |
| 26.10 | Outstanding impaired debts/Total | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x318 | N/A | N/A | boi_ST:x3 | N/A |
| 27.1 | Outstanding debts 90+ days in arrears/Construction and real estate | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | boi_ST:x3 | boi_TI:x2 |
| 27.2 | Outstanding debts 90+ days in arrears/Other | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | boi_ST:x3 | boi_TI:x2 |
| 27.3 | Outstanding debts 90+ days in arrears/Total micro business | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x313 | N/A | N/A | boi_ST:x3 | boi_TI:x2 |
| 27.4 | Outstanding debts 90+ days in arrears/Construction and real estate | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | boi_ST:x3 | boi_TI:x2 |
| 27.5 | Outstanding debts 90+ days in arrears/Other | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | boi_ST:x3 | boi_TI:x2 |
| 27.6 | Outstanding debts 90+ days in arrears/Total Medium business | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x310 | N/A | N/A | boi_ST:x3 | boi_TI:x2 |
| 27.7 | Outstanding debts 90+ days in arrears/Construction and real estate | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | boi_ST:x3 | boi_TI:x2 |
| 27.8 | Outstanding debts 90+ days in arrears/Other | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | boi_ST:x3 | boi_TI:x2 |
| 27.9 | Outstanding debts 90+ days in arrears/Total Large business | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x309 | N/A | N/A | boi_ST:x3 | boi_TI:x2 |
| 27.10 | Outstanding debts 90+ days in arrears/Total | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x8 | N/A | N/A | boi_RP:x24 | boi_SE:x318 | N/A | N/A | boi_ST:x3 | boi_TI:x2 |
| 28.1 | Avg. liability balance/Construction and real estate | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x3 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 28.2 | Avg. liability balance/Other | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x3 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 28.3 | Avg. liability balance/Total micro business | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x3 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 28.4 | Avg. liability balance/Construction and real estate | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x3 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 28.5 | Avg. liability balance/Other | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x3 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 28.6 | Avg. liability balance/Total Medium business | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x3 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 28.7 | Avg. liability balance/Construction and real estate | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x3 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 28.8 | Avg. liability balance/Other | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x3 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 28.9 | Avg. liability balance/Total Large business | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x3 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 28.10 | Avg. liability balance/Total | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x3 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 29.1 | Of which: Avg. balance of deposits of the public/Construction and real estate | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 29.2 | Of which: Avg. balance of deposits of the public/Other | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 29.3 | Of which: Avg. balance of deposits of the public/Total micro business | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 29.4 | Of which: Avg. balance of deposits of the public/Construction and real estate | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 29.5 | Of which: Avg. balance of deposits of the public/Other | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 29.6 | Of which: Avg. balance of deposits of the public/Total Medium business | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 29.7 | Of which: Avg. balance of deposits of the public/Construction and real estate | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 29.8 | Of which: Avg. balance of deposits of the public/Other | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 29.9 | Of which: Avg. balance of deposits of the public/Total Large business | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 29.10 | Of which: Avg. balance of deposits of the public/Total | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 30.1 | Balance of deposits of the public at end of reporting period/Construction and real estate | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | N/A | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 30.2 | Balance of deposits of the public at end of reporting period/Other | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | N/A | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 30.3 | Balance of deposits of the public at end of reporting period/Total micro business | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | N/A | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 30.4 | Balance of deposits of the public at end of reporting period/Construction and real estate | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | N/A | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 30.5 | Balance of deposits of the public at end of reporting period/Other | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | N/A | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 30.6 | Balance of deposits of the public at end of reporting period/Total Medium business | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | N/A | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 30.7 | Balance of deposits of the public at end of reporting period/Construction and real estate | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | N/A | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 30.8 | Balance of deposits of the public at end of reporting period/Other | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | N/A | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 30.9 | Balance of deposits of the public at end of reporting period/Total Large business | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | N/A | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 30.10 | Balance of deposits of the public at end of reporting period/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x17 | N/A | N/A | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 31.1 | Avg. balance of risk assets/Construction and real estate | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 31.2 | Avg. balance of risk assets/Other | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 31.3 | Avg. balance of risk assets/Total micro business | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 31.4 | Avg. balance of risk assets/Construction and real estate | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 31.5 | Avg. balance of risk assets/Other | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 31.6 | Avg. balance of risk assets/Total Medium business | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 31.7 | Avg. balance of risk assets/Construction and real estate | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 31.8 | Avg. balance of risk assets/Other | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 31.9 | Avg. balance of risk assets/Total Large business | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 31.10 | Avg. balance of risk assets/Total | boi_met:md88 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 32.1 | Balance of risk assets at end of reporting period/Construction and real estate | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 32.2 | Balance of risk assets at end of reporting period/Other | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 32.3 | Balance of risk assets at end of reporting period/Total micro business | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 32.4 | Balance of risk assets at end of reporting period/Construction and real estate | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 32.5 | Balance of risk assets at end of reporting period/Other | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 32.6 | Balance of risk assets at end of reporting period/Total Medium business | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 32.7 | Balance of risk assets at end of reporting period/Construction and real estate | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 32.8 | Balance of risk assets at end of reporting period/Other | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 32.9 | Balance of risk assets at end of reporting period/Total Large business | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 32.10 | Balance of risk assets at end of reporting period/Total | boi_met:mi30 | xbrli:monetaryItemType | instant | boi_BC:x16 | N/A | boi_CS:x2 | boi_GA:x1 | N/A | N/A | N/A | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 33.1 | Avg. balance of assets managed/Construction and real estate | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x29 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x265 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 33.2 | Avg. balance of assets managed/Other | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x29 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x265 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 33.3 | Avg. balance of assets managed/Total micro business | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x29 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x265 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 33.4 | Avg. balance of assets managed/Construction and real estate | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x29 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x265 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 33.5 | Avg. balance of assets managed/Other | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x29 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x265 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 33.6 | Avg. balance of assets managed/Total Medium business | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x29 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x265 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 33.7 | Avg. balance of assets managed/Construction and real estate | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x29 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x265 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 33.8 | Avg. balance of assets managed/Other | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x29 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x265 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 33.9 | Avg. balance of assets managed/Total Large business | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x29 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x265 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 33.10 | Avg. balance of assets managed/Total | boi_met:md1064 | xbrli:monetaryItemType | instant | boi_BC:x29 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x265 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| r37.1 | Sources of net interest income:/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| r37.2 | Sources of net interest income:/Other | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| r37.3 | Sources of net interest income:/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| r37.4 | Sources of net interest income:/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| r37.5 | Sources of net interest income:/Other | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| r37.6 | Sources of net interest income:/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| r37.7 | Sources of net interest income:/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| r37.8 | Sources of net interest income:/Other | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| r37.9 | Sources of net interest income:/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| r37.10 | Sources of net interest income:/Total | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 34.1 | Profit from credit-issuing activity/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 34.2 | Profit from credit-issuing activity/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 34.3 | Profit from credit-issuing activity/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 34.4 | Profit from credit-issuing activity/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 34.5 | Profit from credit-issuing activity/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 34.6 | Profit from credit-issuing activity/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 34.7 | Profit from credit-issuing activity/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 34.8 | Profit from credit-issuing activity/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 34.9 | Profit from credit-issuing activity/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 34.10 | Profit from credit-issuing activity/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 35.1 | Profit from deposit-acceptance activity/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x17 | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 35.2 | Profit from deposit-acceptance activity/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x17 | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 35.3 | Profit from deposit-acceptance activity/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x17 | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 35.4 | Profit from deposit-acceptance activity/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x17 | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 35.5 | Profit from deposit-acceptance activity/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x17 | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 35.6 | Profit from deposit-acceptance activity/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x17 | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 35.7 | Profit from deposit-acceptance activity/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x17 | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 35.8 | Profit from deposit-acceptance activity/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x17 | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 35.9 | Profit from deposit-acceptance activity/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x17 | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 35.10 | Profit from deposit-acceptance activity/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x17 | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 36.1 | Other/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x975 | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 36.2 | Other/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x975 | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 36.3 | Other/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x975 | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 36.4 | Other/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x975 | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 36.5 | Other/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x975 | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 36.6 | Other/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x975 | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 36.7 | Other/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x975 | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 36.8 | Other/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x975 | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 36.9 | Other/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x975 | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 36.10 | Other/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | boi_MC:x975 | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
| 37.1 | Total interest income, net/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x301 | N/A | N/A | N/A |
| 37.2 | Total interest income, net/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | boi_SE:x323 | N/A | N/A | N/A |
| 37.3 | Total interest income, net/Total micro business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x313 | N/A | N/A | N/A | N/A |
| 37.4 | Total interest income, net/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x301 | N/A | N/A | N/A |
| 37.5 | Total interest income, net/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | boi_SE:x323 | N/A | N/A | N/A |
| 37.6 | Total interest income, net/Total Medium business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x310 | N/A | N/A | N/A | N/A |
| 37.7 | Total interest income, net/Construction and real estate | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x301 | N/A | N/A | N/A |
| 37.8 | Total interest income, net/Other | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | boi_SE:x323 | N/A | N/A | N/A |
| 37.9 | Total interest income, net/Total Large business | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x309 | N/A | N/A | N/A | N/A |
| 37.10 | Total interest income, net/Total | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_GA:x1 | boi_MC:x125 | N/A | boi_MU:x1 | boi_RP:x24 | boi_SE:x318 | N/A | N/A | N/A | N/A |
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