| r0.1 | label_boi_a2/Number of Inactive Deposit Accounts | boi_met:ii289 | xbrli:integerItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | N/A | N/A | boi_ST:x201 |
| r0.2 | label_boi_a2/Balance of Inactive Deposit Accounts | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | N/A | N/A | N/A | boi_ST:x201 |
| 1.1 | Opening Balance/Number of Inactive Deposit Accounts | boi_met:ii289 | xbrli:integerItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_MC:x17 | boi_RP:x22 | N/A | boi_ST:x201 |
| 1.2 | Opening Balance/Balance of Inactive Deposit Accounts | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_MC:x17 | boi_RP:x22 | N/A | boi_ST:x201 |
| 2.1 | Subtracted Accounts during Quarter/Number of Inactive Deposit Accounts | boi_met:ii289 | xbrli:integerItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_MC:x1079 | N/A | N/A | boi_ST:x201 |
| 2.2 | Subtracted Accounts during Quarter/Balance of Inactive Deposit Accounts | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_MC:x1079 | N/A | N/A | boi_ST:x201 |
| 3.1 | Added Accounts during Quarter/Number of Inactive Deposit Accounts | boi_met:ii289 | xbrli:integerItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_MC:x1080 | N/A | N/A | boi_ST:x201 |
| 3.2 | Added Accounts during Quarter/Balance of Inactive Deposit Accounts | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_MC:x1080 | N/A | N/A | boi_ST:x201 |
| 4.1 | Closing Balance/Number of Inactive Deposit Accounts | boi_met:ii289 | xbrli:integerItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_MC:x17 | N/A | N/A | boi_ST:x201 |
| 4.2 | Closing Balance/Balance of Inactive Deposit Accounts | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_MC:x17 | N/A | N/A | boi_ST:x201 |
| 5.1 | Of which: Reported to Administrator General/Number of Inactive Deposit Accounts | boi_met:ii289 | xbrli:integerItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_MC:x17 | N/A | boi_ST:x202 | boi_ST:x201 |
| 5.2 | Of which: Reported to Administrator General/Balance of Inactive Deposit Accounts | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x2 | boi_CS:x1 | boi_MC:x17 | N/A | boi_ST:x202 | boi_ST:x201 |