| r0.1 | label_boi_a2/year (-4) | | | | N/A | N/A | boi_CS:x2 | N/A | N/A | boi_RP:x27 | N/A |
| r1.1 | Main performance indices/year (-4) | | | | N/A | N/A | boi_CS:x2 | N/A | N/A | boi_RP:x27 | N/A |
| 1.1 | Return on equity/year (-4) | boi_met:pd85 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x27 | N/A |
| 2.1 | Return on average assets/year (-4) | boi_met:pd1179 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x27 | N/A |
| 3.1 | Tier 1 equity capital / risk components ratio/year (-4) | boi_met:pi37 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | N/A | boi_RP:x27 | N/A |
| 4.1 | Leverage ratio/year (-4) | boi_met:pi903 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | N/A | boi_RP:x27 | N/A |
| 5.1 | Liquidity coverage ratio/year (-4) | boi_met:ri793 | xbrli:decimalItemType | instant | N/A | N/A | boi_CS:x2 | N/A | N/A | boi_RP:x27 | N/A |
| 6.1 | Income to average assets ratio/year (-4) | boi_met:pi1198 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x27 | N/A |
| 7.1 | Efficiency ratio/year (-4) | boi_met:pi1180 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x27 | N/A |
| r9.1 | Main credit quality indices/year (-4) | | | | N/A | N/A | boi_CS:x2 | N/A | N/A | boi_RP:x27 | N/A |
| 8.1 | Loan loss provisions as a share of credit to the public/year (-4) | boi_met:pi1181 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | N/A | boi_RP:x27 | N/A |
| 9.1 | Impaired debts or debts 90 days or more in arrears as a share of credit to the public/year (-4) | boi_met:pi1182 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | N/A | boi_RP:x27 | N/A |
| 10.1 | Net accounting write-off as a share of average credit to the public/year (-4) | boi_met:pi1183 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x27 | N/A |
| r13.1 | Main data from profit and loss report/year (-4) | boi_met:md13 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x27 | N/A |
| 11.1 | Net profit attributed to shareholders of the banking corporation/year (-4) | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x27 | N/A |
| 12.1 | Net Intrest income/year (-4) | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x125 | boi_MU:x1 | boi_RP:x27 | N/A |
| 13.1 | Expenses in respect of credit losses/year (-4) | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x12 | N/A | boi_CS:x2 | boi_MC:x126 | boi_MU:x1 | boi_RP:x27 | N/A |
| 14.1 | Total non interest income/year (-4) | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x11 | N/A | boi_CS:x2 | boi_MC:x127 | boi_MU:x1 | boi_RP:x27 | N/A |
| 15.1 | Fees/year (-4) | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x9 | N/A | boi_CS:x2 | boi_MC:x141 | boi_MU:x1 | boi_RP:x27 | N/A |
| 16.1 | Operating and other expenses/year (-4) | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x160 | boi_MU:x1 | boi_RP:x27 | N/A |
| 17.1 | Salaries and related expences/year (-4) | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | N/A | boi_CS:x2 | boi_MC:x161 | boi_MU:x1 | boi_RP:x27 | N/A |
| r21.1 | Net profit per share/year (-4) | | | | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x27 | N/A |
| 18.1 | Base profit per share/year (-4) | boi_met:md81 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x27 | N/A |
| 19.1 | Diluted profit per share/year (-4) | boi_met:md82 | xbrli:monetaryItemType | instant | boi_BC:x11 | boi_CN:x1 | boi_CS:x2 | boi_MC:x121 | boi_MU:x1 | boi_RP:x27 | N/A |
| r24.1 | Maindata from balancesheet/year (-4) | boi_met:mi1 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | N/A | N/A | boi_RP:x27 | N/A |
| 20.1 | Total assets/year (-4) | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x1 | N/A | boi_RP:x27 | N/A |
| 21.1 | Cash and deposits with banks/year (-4) | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x9 | N/A | boi_RP:x27 | boi_SE:x1 |
| 22.1 | Securities/year (-4) | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x29 | N/A | boi_RP:x27 | N/A |
| 23.1 | Credit to the public, net/year (-4) | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | N/A | boi_CS:x2 | boi_MC:x8 | N/A | boi_RP:x27 | boi_SE:x16 |
| 24.1 | Total liabilities/year (-4) | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_MC:x3 | N/A | boi_RP:x27 | N/A |
| 25.1 | Deposits of the public/year (-4) | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_MC:x17 | N/A | boi_RP:x27 | boi_SE:x16 |
| 26.1 | Deposits from banks/year (-4) | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_MC:x17 | N/A | boi_RP:x27 | boi_SE:x1 |
| 27.1 | Debentures and subordinated notes/year (-4) | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | N/A | boi_CS:x2 | boi_MC:x15 | N/A | boi_RP:x27 | N/A |
| 28.1 | Equity capital attributed to shareholders of the banking corporation/year (-4) | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CN:x1 | boi_CS:x2 | boi_MC:x2 | N/A | boi_RP:x27 | N/A |
| r34.1 | Additional data/year (-4) | | | | N/A | N/A | boi_CS:x2 | N/A | N/A | boi_RP:x27 | N/A |
| 29.1 | Share price/year (-4) | boi_met:mi1184 | xbrli:monetaryItemType | instant | N/A | N/A | boi_CS:x2 | N/A | N/A | boi_RP:x27 | N/A |
| 30.1 | Dividend per share/year (-4) | boi_met:mi1185 | xbrli:monetaryItemType | instant | boi_BC:x3 | boi_CN:x1 | boi_CS:x2 | boi_MC:x398 | boi_MU:x1 | boi_RP:x27 | N/A |
| 31.1 | Average Number of posts/year (-4) | boi_met:rd296 | xbrli:decimalItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x27 | N/A |
| 32.1 | Net Intrest income to Average assets ratio/year (-4) | boi_met:pi1199 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x27 | N/A |
| 33.1 | Fee to asset ratio/year (-4) | boi_met:pi1187 | num:percentItemType | instant | N/A | N/A | boi_CS:x2 | N/A | boi_MU:x1 | boi_RP:x27 | N/A |