| r0.1 | label_boi_a2/Financial items | | | | N/A | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | N/A | N/A | N/A |
| r0.2 | label_boi_a2/Non-financial items | | | | N/A | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | N/A | N/A | N/A |
| r0.3 | label_boi_a2/Total | | | | N/A | boi_CS:x1 | N/A | boi_GA:x1 | N/A | N/A | N/A | N/A |
| r0.4 | label_boi_a2/Financial items | | | | N/A | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | N/A | N/A | N/A |
| r0.5 | label_boi_a2/Non-financial items | | | | N/A | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | N/A | N/A | N/A |
| r0.6 | label_boi_a2/Total | | | | N/A | boi_CS:x1 | N/A | boi_GA:x2 | N/A | N/A | N/A | N/A |
| r0.7 | label_boi_a2/Total | | | | N/A | boi_CS:x1 | N/A | N/A | N/A | N/A | N/A | N/A |
| r1.1 | Assets/Financial items | | | | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | N/A | N/A | N/A |
| r1.2 | Assets/Non-financial items | | | | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | N/A | N/A | N/A |
| r1.3 | Assets/Total | | | | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | N/A | N/A | N/A |
| r1.4 | Assets/Financial items | | | | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | N/A | N/A | N/A |
| r1.5 | Assets/Non-financial items | | | | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | N/A | N/A | N/A |
| r1.6 | Assets/Total | | | | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | N/A | N/A | N/A |
| r1.7 | Assets/Total | | | | boi_BC:x1 | boi_CS:x1 | N/A | N/A | N/A | N/A | N/A | N/A |
| 1.1 | Cash and bank deposits/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x9 | boi_SE:x1 | N/A |
| 1.2 | Cash and bank deposits/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x9 | boi_SE:x1 | N/A |
| 1.3 | Cash and bank deposits/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x9 | boi_SE:x1 | N/A |
| 1.4 | Cash and bank deposits/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x9 | boi_SE:x1 | N/A |
| 1.5 | Cash and bank deposits/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x9 | boi_SE:x1 | N/A |
| 1.6 | Cash and bank deposits/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x9 | boi_SE:x1 | N/A |
| 1.7 | Cash and bank deposits/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x9 | boi_SE:x1 | N/A |
| 2.1 | Securities/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x29 | N/A | N/A |
| 2.2 | Securities/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x29 | N/A | N/A |
| 2.3 | Securities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x29 | N/A | N/A |
| 2.4 | Securities/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x29 | N/A | N/A |
| 2.5 | Securities/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x29 | N/A | N/A |
| 2.6 | Securities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x29 | N/A | N/A |
| 2.7 | Securities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x29 | N/A | N/A |
| 3.1 | Securities borrowed or acquired under repurchase agreements/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x28 | N/A | N/A |
| 3.2 | Securities borrowed or acquired under repurchase agreements/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x28 | N/A | N/A |
| 3.3 | Securities borrowed or acquired under repurchase agreements/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x28 | N/A | N/A |
| 3.4 | Securities borrowed or acquired under repurchase agreements/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x28 | N/A | N/A |
| 3.5 | Securities borrowed or acquired under repurchase agreements/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x28 | N/A | N/A |
| 3.6 | Securities borrowed or acquired under repurchase agreements/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x28 | N/A | N/A |
| 3.7 | Securities borrowed or acquired under repurchase agreements/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x28 | N/A | N/A |
| 4.1 | Credit to the public/Financial items | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 4.2 | Credit to the public/Non-financial items | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 4.3 | Credit to the public/Total | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 4.4 | Credit to the public/Financial items | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 4.5 | Credit to the public/Non-financial items | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 4.6 | Credit to the public/Total | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 4.7 | Credit to the public/Total | boi_met:mi2 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 5.1 | Credit loss provision/Financial items | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 5.2 | Credit loss provision/Non-financial items | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 5.3 | Credit loss provision/Total | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 5.4 | Credit loss provision/Financial items | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 5.5 | Credit loss provision/Non-financial items | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 5.6 | Credit loss provision/Total | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 5.7 | Credit loss provision/Total | boi_met:mi3 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 6.1 | Credit to the public, net/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 6.2 | Credit to the public, net/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 6.3 | Credit to the public, net/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 6.4 | Credit to the public, net/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 6.5 | Credit to the public, net/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 6.6 | Credit to the public, net/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 6.7 | Credit to the public, net/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x8 | boi_SE:x16 | N/A |
| 7.1 | Credit to the government/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x8 | boi_SE:x11 | N/A |
| 7.2 | Credit to the government/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x8 | boi_SE:x11 | N/A |
| 7.3 | Credit to the government/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x8 | boi_SE:x11 | N/A |
| 7.4 | Credit to the government/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x8 | boi_SE:x11 | N/A |
| 7.5 | Credit to the government/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x8 | boi_SE:x11 | N/A |
| 7.6 | Credit to the government/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x8 | boi_SE:x11 | N/A |
| 7.7 | Credit to the government/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x8 | boi_SE:x11 | N/A |
| 8.1 | Investments in held companies/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x54 | N/A | N/A |
| 8.2 | Investments in held companies/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x54 | N/A | N/A |
| 8.3 | Investments in held companies/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x54 | N/A | N/A |
| 8.4 | Investments in held companies/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x54 | N/A | N/A |
| 8.5 | Investments in held companies/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x54 | N/A | N/A |
| 8.6 | Investments in held companies/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x54 | N/A | N/A |
| 8.7 | Investments in held companies/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x54 | N/A | N/A |
| 9.1 | Buildings and equipment/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x6 | N/A | N/A |
| 9.2 | Buildings and equipment/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x6 | N/A | N/A |
| 9.3 | Buildings and equipment/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x6 | N/A | N/A |
| 9.4 | Buildings and equipment/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x6 | N/A | N/A |
| 9.5 | Buildings and equipment/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x6 | N/A | N/A |
| 9.6 | Buildings and equipment/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x6 | N/A | N/A |
| 9.7 | Buildings and equipment/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x6 | N/A | N/A |
| 10.1 | Intangible assets and goodwill/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x19 | N/A | N/A |
| 10.2 | Intangible assets and goodwill/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x19 | N/A | N/A |
| 10.3 | Intangible assets and goodwill/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x19 | N/A | N/A |
| 10.4 | Intangible assets and goodwill/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x19 | N/A | N/A |
| 10.5 | Intangible assets and goodwill/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x19 | N/A | N/A |
| 10.6 | Intangible assets and goodwill/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x19 | N/A | N/A |
| 10.7 | Intangible assets and goodwill/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x19 | N/A | N/A |
| 11.1 | Assets on account of derivatives/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x18 | N/A | N/A |
| 11.2 | Assets on account of derivatives/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x18 | N/A | N/A |
| 11.3 | Assets on account of derivatives/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x18 | N/A | N/A |
| 11.4 | Assets on account of derivatives/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x18 | N/A | N/A |
| 11.5 | Assets on account of derivatives/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x18 | N/A | N/A |
| 11.6 | Assets on account of derivatives/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x18 | N/A | N/A |
| 11.7 | Assets on account of derivatives/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x18 | N/A | N/A |
| 12.1 | Other assets/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x41 | N/A | N/A |
| 12.2 | Other assets/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x41 | N/A | N/A |
| 12.3 | Other assets/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x41 | N/A | N/A |
| 12.4 | Other assets/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x41 | N/A | N/A |
| 12.5 | Other assets/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x41 | N/A | N/A |
| 12.6 | Other assets/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x41 | N/A | N/A |
| 12.7 | Other assets/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x41 | N/A | N/A |
| 13.1 | Total assets/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x1 | N/A | N/A |
| 13.2 | Total assets/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x1 | N/A | N/A |
| 13.3 | Total assets/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x1 | N/A | N/A |
| 13.4 | Total assets/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x1 | N/A | N/A |
| 13.5 | Total assets/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x1 | N/A | N/A |
| 13.6 | Total assets/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x1 | N/A | N/A |
| 13.7 | Total assets/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x1 | N/A | N/A |
| 14.1 | Thereof: credit from earmarked deposits/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x10 | boi_SE:x16 | N/A |
| 14.2 | Thereof: credit from earmarked deposits/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x10 | boi_SE:x16 | N/A |
| 14.3 | Thereof: credit from earmarked deposits/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x10 | boi_SE:x16 | N/A |
| 14.4 | Thereof: credit from earmarked deposits/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x10 | boi_SE:x16 | N/A |
| 14.5 | Thereof: credit from earmarked deposits/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x10 | boi_SE:x16 | N/A |
| 14.6 | Thereof: credit from earmarked deposits/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x10 | boi_SE:x16 | N/A |
| 14.7 | Thereof: credit from earmarked deposits/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x10 | boi_SE:x16 | N/A |
| 15.1 | Thereof: balance-sheet credit risk originating in Israeli construction and real-estate industry/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | boi_GA:x1 | boi_MC:x42 | boi_SE:x16 | boi_SE:x8 |
| 15.2 | Thereof: balance-sheet credit risk originating in Israeli construction and real-estate industry/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | boi_GA:x1 | boi_MC:x42 | boi_SE:x16 | boi_SE:x8 |
| 15.3 | Thereof: balance-sheet credit risk originating in Israeli construction and real-estate industry/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x1 | boi_GA:x1 | boi_MC:x42 | boi_SE:x16 | boi_SE:x8 |
| 15.4 | Thereof: balance-sheet credit risk originating in Israeli construction and real-estate industry/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | boi_GA:x1 | boi_MC:x42 | boi_SE:x16 | boi_SE:x8 |
| 15.5 | Thereof: balance-sheet credit risk originating in Israeli construction and real-estate industry/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | boi_GA:x1 | boi_MC:x42 | boi_SE:x16 | boi_SE:x8 |
| 15.6 | Thereof: balance-sheet credit risk originating in Israeli construction and real-estate industry/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | boi_GA:x2 | boi_GA:x1 | boi_MC:x42 | boi_SE:x16 | boi_SE:x8 |
| 15.7 | Thereof: balance-sheet credit risk originating in Israeli construction and real-estate industry/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x1 | N/A | N/A | boi_GA:x1 | boi_MC:x42 | boi_SE:x16 | boi_SE:x8 |
| r17.1 | Liabilities and capital/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | N/A | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | N/A | N/A | N/A |
| r17.2 | Liabilities and capital/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | N/A | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | N/A | N/A | N/A |
| r17.3 | Liabilities and capital/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | N/A | boi_CS:x1 | N/A | boi_GA:x1 | N/A | N/A | N/A | N/A |
| r17.4 | Liabilities and capital/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | N/A | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | N/A | N/A | N/A |
| r17.5 | Liabilities and capital/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | N/A | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | N/A | N/A | N/A |
| r17.6 | Liabilities and capital/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | N/A | boi_CS:x1 | N/A | boi_GA:x2 | N/A | N/A | N/A | N/A |
| r17.7 | Liabilities and capital/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | N/A | boi_CS:x1 | N/A | N/A | N/A | N/A | N/A | N/A |
| 16.1 | Deposits of the public/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x17 | boi_SE:x16 | N/A |
| 16.2 | Deposits of the public/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x17 | boi_SE:x16 | N/A |
| 16.3 | Deposits of the public/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x17 | boi_SE:x16 | N/A |
| 16.4 | Deposits of the public/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x17 | boi_SE:x16 | N/A |
| 16.5 | Deposits of the public/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x17 | boi_SE:x16 | N/A |
| 16.6 | Deposits of the public/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x17 | boi_SE:x16 | N/A |
| 16.7 | Deposits of the public/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x17 | boi_SE:x16 | N/A |
| 17.1 | Deposits from banks/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x17 | boi_SE:x1 | N/A |
| 17.2 | Deposits from banks/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x17 | boi_SE:x1 | N/A |
| 17.3 | Deposits from banks/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x17 | boi_SE:x1 | N/A |
| 17.4 | Deposits from banks/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x17 | boi_SE:x1 | N/A |
| 17.5 | Deposits from banks/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x17 | boi_SE:x1 | N/A |
| 17.6 | Deposits from banks/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x17 | boi_SE:x1 | N/A |
| 17.7 | Deposits from banks/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x17 | boi_SE:x1 | N/A |
| 18.1 | Government deposits/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x17 | boi_SE:x11 | N/A |
| 18.2 | Government deposits/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x17 | boi_SE:x11 | N/A |
| 18.3 | Government deposits/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x17 | boi_SE:x11 | N/A |
| 18.4 | Government deposits/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x17 | boi_SE:x11 | N/A |
| 18.5 | Government deposits/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x17 | boi_SE:x11 | N/A |
| 18.6 | Government deposits/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x17 | boi_SE:x11 | N/A |
| 18.7 | Government deposits/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x17 | boi_SE:x11 | N/A |
| 19.1 | Securities lent or sold under repurchase agreements/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x28 | N/A | N/A |
| 19.2 | Securities lent or sold under repurchase agreements/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x28 | N/A | N/A |
| 19.3 | Securities lent or sold under repurchase agreements/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x28 | N/A | N/A |
| 19.4 | Securities lent or sold under repurchase agreements/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x28 | N/A | N/A |
| 19.5 | Securities lent or sold under repurchase agreements/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x28 | N/A | N/A |
| 19.6 | Securities lent or sold under repurchase agreements/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x28 | N/A | N/A |
| 19.7 | Securities lent or sold under repurchase agreements/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x28 | N/A | N/A |
| 20.1 | Bonds and subordinated capital notes/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x15 | N/A | N/A |
| 20.2 | Bonds and subordinated capital notes/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x15 | N/A | N/A |
| 20.3 | Bonds and subordinated capital notes/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x15 | N/A | N/A |
| 20.4 | Bonds and subordinated capital notes/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x15 | N/A | N/A |
| 20.5 | Bonds and subordinated capital notes/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x15 | N/A | N/A |
| 20.6 | Bonds and subordinated capital notes/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x15 | N/A | N/A |
| 20.7 | Bonds and subordinated capital notes/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x15 | N/A | N/A |
| 21.1 | Liabilities on account of derivatives/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x18 | N/A | N/A |
| 21.2 | Liabilities on account of derivatives/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x18 | N/A | N/A |
| 21.3 | Liabilities on account of derivatives/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x18 | N/A | N/A |
| 21.4 | Liabilities on account of derivatives/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x18 | N/A | N/A |
| 21.5 | Liabilities on account of derivatives/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x18 | N/A | N/A |
| 21.6 | Liabilities on account of derivatives/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x18 | N/A | N/A |
| 21.7 | Liabilities on account of derivatives/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x18 | N/A | N/A |
| 22.1 | Other liabilities/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x20 | N/A | N/A |
| 22.2 | Other liabilities/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x20 | N/A | N/A |
| 22.3 | Other liabilities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x20 | N/A | N/A |
| 22.4 | Other liabilities/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x20 | N/A | N/A |
| 22.5 | Other liabilities/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x20 | N/A | N/A |
| 22.6 | Other liabilities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x20 | N/A | N/A |
| 22.7 | Other liabilities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x20 | N/A | N/A |
| 23.1 | Total liabilities/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x3 | N/A | N/A |
| 23.2 | Total liabilities/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x3 | N/A | N/A |
| 23.3 | Total liabilities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x3 | N/A | N/A |
| 23.4 | Total liabilities/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x3 | N/A | N/A |
| 23.5 | Total liabilities/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x3 | N/A | N/A |
| 23.6 | Total liabilities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x3 | N/A | N/A |
| 23.7 | Total liabilities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x3 | N/A | N/A |
| 24.1 | Quasi-capital liabilities/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x39 | N/A | N/A |
| 24.2 | Quasi-capital liabilities/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x39 | N/A | N/A |
| 24.3 | Quasi-capital liabilities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x39 | N/A | N/A |
| 24.4 | Quasi-capital liabilities/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x39 | N/A | N/A |
| 24.5 | Quasi-capital liabilities/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x39 | N/A | N/A |
| 24.6 | Quasi-capital liabilities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x39 | N/A | N/A |
| 24.7 | Quasi-capital liabilities/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x39 | N/A | N/A |
| 25.1 | Difference / total equity/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x40 | N/A | N/A |
| 25.2 | Difference / total equity/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x40 | N/A | N/A |
| 25.3 | Difference / total equity/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x40 | N/A | N/A |
| 25.4 | Difference / total equity/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x40 | N/A | N/A |
| 25.5 | Difference / total equity/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x40 | N/A | N/A |
| 25.6 | Difference / total equity/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x40 | N/A | N/A |
| 25.7 | Difference / total equity/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x40 | N/A | N/A |
| 26.1 | Total liabilities and capital/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x4 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | N/A | N/A | N/A |
| 26.2 | Total liabilities and capital/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x4 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | N/A | N/A | N/A |
| 26.3 | Total liabilities and capital/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x4 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | N/A | N/A | N/A |
| 26.4 | Total liabilities and capital/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x4 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | N/A | N/A | N/A |
| 26.5 | Total liabilities and capital/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x4 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | N/A | N/A | N/A |
| 26.6 | Total liabilities and capital/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x4 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | N/A | N/A | N/A |
| 26.7 | Total liabilities and capital/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x4 | boi_CS:x1 | N/A | N/A | N/A | N/A | N/A | N/A |
| 27.1 | Thereof: earmarked deposits/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x1 | N/A | boi_MC:x44 | boi_SE:x16 | N/A |
| 27.2 | Thereof: earmarked deposits/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x1 | N/A | boi_MC:x44 | boi_SE:x16 | N/A |
| 27.3 | Thereof: earmarked deposits/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x1 | N/A | boi_MC:x44 | boi_SE:x16 | N/A |
| 27.4 | Thereof: earmarked deposits/Financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x1 | boi_GA:x2 | N/A | boi_MC:x44 | boi_SE:x16 | N/A |
| 27.5 | Thereof: earmarked deposits/Non-financial items | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_FN:x2 | boi_GA:x2 | N/A | boi_MC:x44 | boi_SE:x16 | N/A |
| 27.6 | Thereof: earmarked deposits/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | boi_GA:x2 | N/A | boi_MC:x44 | boi_SE:x16 | N/A |
| 27.7 | Thereof: earmarked deposits/Total | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | N/A | N/A | boi_MC:x44 | boi_SE:x16 | N/A |