| r0.1 | label_boi_a2/consolidated - (including banking corporations who report solo) comulative YTD | | | | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x27 |
| r0.2 | label_boi_a2/consolidated - (including banking corporations who report solo) for the quarter | | | | N/A | N/A | boi_CS:x2 | N/A | N/A | boi_RP:x13 |
| 1.1 | Interest income/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_MC:x125 | boi_MU:x1 | boi_RP:x27 |
| 1.2 | Interest income/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_MC:x125 | N/A | boi_RP:x13 |
| 2.1 | Interest expenses/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x125 | boi_MU:x1 | boi_RP:x27 |
| 2.2 | Interest expenses/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x125 | N/A | boi_RP:x13 |
| 3.1 | Net Intrest income/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x125 | boi_MU:x1 | boi_RP:x27 |
| 3.2 | Net Intrest income/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x125 | N/A | boi_RP:x13 |
| 4.1 | expenses in respect of credit losses/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x126 | boi_MU:x1 | boi_RP:x27 |
| 4.2 | expenses in respect of credit losses/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x126 | N/A | boi_RP:x13 |
| 5.1 | Net Intrest income after expenses in respect of credit losses/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x124 | boi_MU:x1 | boi_RP:x27 |
| 5.2 | Net Intrest income after expenses in respect of credit losses/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x124 | N/A | boi_RP:x13 |
| r6.1 | Non-interest income/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x27 |
| r6.2 | Non-interest income/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | N/A | N/A | boi_RP:x13 |
| 6.1 | Non-interest financing income/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x128 | boi_MU:x1 | boi_RP:x27 |
| 6.2 | Non-interest financing income/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x128 | N/A | boi_RP:x13 |
| 7.1 | Fees/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_MC:x141 | boi_MU:x1 | boi_RP:x27 |
| 7.2 | Fees/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_MC:x141 | N/A | boi_RP:x13 |
| 8.1 | Other income/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x153 | boi_MU:x1 | boi_RP:x27 |
| 8.2 | Other income/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x153 | N/A | boi_RP:x13 |
| 9.1 | Total non interest income/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x127 | boi_MU:x1 | boi_RP:x27 |
| 9.2 | Total non interest income/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x127 | N/A | boi_RP:x13 |
| 10.1 | Operating and other expenses: Salaries and related expences/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x161 | boi_MU:x1 | boi_RP:x27 |
| 10.2 | Operating and other expenses: Salaries and related expences/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x161 | N/A | boi_RP:x13 |
| 11.1 | Maintenance and depreciation on building and equipment/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x171 | boi_MU:x1 | boi_RP:x27 |
| 11.2 | Maintenance and depreciation on building and equipment/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x171 | N/A | boi_RP:x13 |
| 12.1 | Amortisations and impairments of intangible assets and goodwill/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x172 | boi_MU:x1 | boi_RP:x27 |
| 12.2 | Amortisations and impairments of intangible assets and goodwill/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x172 | N/A | boi_RP:x13 |
| 13.1 | other expenses/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x173 | boi_MU:x1 | boi_RP:x27 |
| 13.2 | other expenses/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x173 | N/A | boi_RP:x13 |
| 14.1 | Total/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x160 | boi_MU:x1 | boi_RP:x27 |
| 14.2 | Total/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x160 | N/A | boi_RP:x13 |
| 15.1 | profit before taxes/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x123 | boi_MU:x1 | boi_RP:x27 |
| 15.2 | profit before taxes/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x123 | N/A | boi_RP:x13 |
| 16.1 | provision for taxes on profit/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x190 | boi_MU:x1 | boi_RP:x27 |
| 16.2 | provision for taxes on profit/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x190 | N/A | boi_RP:x13 |
| 17.1 | profit after taxes/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x122 | boi_MU:x1 | boi_RP:x27 |
| 17.2 | profit after taxes/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x122 | N/A | boi_RP:x13 |
| 18.1 | Banking corporation's share in profits of companies included on equity basis after the effect of taxes/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x191 | boi_MU:x1 | boi_RP:x27 |
| 18.2 | Banking corporation's share in profits of companies included on equity basis after the effect of taxes/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x191 | N/A | boi_RP:x13 |
| r20.1 | Net profit:/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x27 |
| r20.2 | Net profit:/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | N/A | boi_RP:x13 |
| 19.1 | Before attributing to noncontrolling interests/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x27 |
| 19.2 | Before attributing to noncontrolling interests/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x121 | N/A | boi_RP:x13 |
| 20.1 | Attributed to noncontrolling interests/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x27 |
| 20.2 | Attributed to noncontrolling interests/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x2 | boi_CS:x2 | boi_MC:x121 | N/A | boi_RP:x13 |
| 21.1 | Attributed to shareholders of the banking corporation/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x27 |
| 21.2 | Attributed to shareholders of the banking corporation/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | N/A | boi_RP:x13 |
| 22.1 | Basic earnings per share attributed to shareholders of the banking corporation/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md81 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x27 |
| 22.2 | Basic earnings per share attributed to shareholders of the banking corporation/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md81 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | N/A | boi_RP:x13 |
| 23.1 | Diluted earnings per share attributed to shareholders of the banking corporation/consolidated - (including banking corporations who report solo) comulative YTD | boi_met:md82 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x27 |
| 23.2 | Diluted earnings per share attributed to shareholders of the banking corporation/consolidated - (including banking corporations who report solo) for the quarter | boi_met:md82 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | N/A | boi_RP:x13 |