| r0.1 | label_boi_a2/E-banking channels | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | N/A |
| r0.2 | label_boi_a2/Website | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | N/A |
| r0.3 | label_boi_a2/Application | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | N/A |
| r0.4 | label_boi_a2/Self-service stands (ATMs) | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | N/A |
| r0.5 | label_boi_a2/Teller at branch | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | N/A |
| r0.6 | label_boi_a2/Total | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | N/A |
| r1.1 | Balance at end of half-year/E-banking channels | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | N/A |
| r1.2 | Balance at end of half-year/Website | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | N/A |
| r1.3 | Balance at end of half-year/Application | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | N/A |
| r1.4 | Balance at end of half-year/Self-service stands (ATMs) | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | N/A |
| r1.5 | Balance at end of half-year/Teller at branch | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | N/A |
| r1.6 | Balance at end of half-year/Total | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | N/A |
| 1.1 | Accounts of subscribers to e-banking channels/E-banking channels | boi_met:ii289 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | N/A |
| 1.2 | Accounts of subscribers to e-banking channels/Website | boi_met:ii289 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | N/A |
| 1.3 | Accounts of subscribers to e-banking channels/Application | boi_met:ii289 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | N/A |
| 1.4 | Accounts of subscribers to e-banking channels/Self-service stands (ATMs) | boi_met:ii289 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | N/A |
| 1.5 | Accounts of subscribers to e-banking channels/Teller at branch | boi_met:ii289 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | N/A |
| 1.6 | Accounts of subscribers to e-banking channels/Total | boi_met:ii289 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | N/A |
| 2.1 | of which: online accounts/E-banking channels | boi_met:ii689 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | N/A |
| 2.2 | of which: online accounts/Website | boi_met:ii689 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | N/A |
| 2.3 | of which: online accounts/Application | boi_met:ii689 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | N/A |
| 2.4 | of which: online accounts/Self-service stands (ATMs) | boi_met:ii689 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | N/A |
| 2.5 | of which: online accounts/Teller at branch | boi_met:ii689 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | N/A |
| 2.6 | of which: online accounts/Total | boi_met:ii689 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | N/A |
| r4.1 | Activity during reported half-year/E-banking channels | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | N/A |
| r4.2 | Activity during reported half-year/Website | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | N/A |
| r4.3 | Activity during reported half-year/Application | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | N/A |
| r4.4 | Activity during reported half-year/Self-service stands (ATMs) | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | N/A |
| r4.5 | Activity during reported half-year/Teller at branch | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | N/A |
| r4.6 | Activity during reported half-year/Total | | | | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | N/A |
| 3.1 | Current accounts and SROs opened during the half-year reported/E-banking channels | boi_met:ii682 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | N/A |
| 3.2 | Current accounts and SROs opened during the half-year reported/Website | boi_met:ii682 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | N/A |
| 3.3 | Current accounts and SROs opened during the half-year reported/Application | boi_met:ii682 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | N/A |
| 3.4 | Current accounts and SROs opened during the half-year reported/Self-service stands (ATMs) | boi_met:ii682 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | N/A |
| 3.5 | Current accounts and SROs opened during the half-year reported/Teller at branch | boi_met:ii682 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | N/A |
| 3.6 | Current accounts and SROs opened during the half-year reported/Total | boi_met:ii682 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | N/A |
| r6.1 | Accounts in which an identified entry was made/E-banking channels | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | N/A |
| r6.2 | Accounts in which an identified entry was made/Website | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | N/A |
| r6.3 | Accounts in which an identified entry was made/Application | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | N/A |
| r6.4 | Accounts in which an identified entry was made/Self-service stands (ATMs) | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | N/A |
| r6.5 | Accounts in which an identified entry was made/Teller at branch | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | N/A |
| r6.6 | Accounts in which an identified entry was made/Total | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | N/A |
| 4.1 | Customers up to age 25/E-banking channels | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | boi_TI:x169 |
| 4.2 | Customers up to age 25/Website | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | boi_TI:x169 |
| 4.3 | Customers up to age 25/Application | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | boi_TI:x169 |
| 4.4 | Customers up to age 25/Self-service stands (ATMs) | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | boi_TI:x169 |
| 4.5 | Customers up to age 25/Teller at branch | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | boi_TI:x169 |
| 4.6 | Customers up to age 25/Total | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | boi_TI:x169 |
| 5.1 | Customers ages 26-50/E-banking channels | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | boi_TI:x170 |
| 5.2 | Customers ages 26-50/Website | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | boi_TI:x170 |
| 5.3 | Customers ages 26-50/Application | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | boi_TI:x170 |
| 5.4 | Customers ages 26-50/Self-service stands (ATMs) | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | boi_TI:x170 |
| 5.5 | Customers ages 26-50/Teller at branch | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | boi_TI:x170 |
| 5.6 | Customers ages 26-50/Total | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | boi_TI:x170 |
| 6.1 | Customers ages 51-70/E-banking channels | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | boi_TI:x171 |
| 6.2 | Customers ages 51-70/Website | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | boi_TI:x171 |
| 6.3 | Customers ages 51-70/Application | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | boi_TI:x171 |
| 6.4 | Customers ages 51-70/Self-service stands (ATMs) | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | boi_TI:x171 |
| 6.5 | Customers ages 51-70/Teller at branch | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | boi_TI:x171 |
| 6.6 | Customers ages 51-70/Total | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | boi_TI:x171 |
| 7.1 | Customers ages 71 and older/E-banking channels | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | boi_TI:x172 |
| 7.2 | Customers ages 71 and older/Website | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | boi_TI:x172 |
| 7.3 | Customers ages 71 and older/Application | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | boi_TI:x172 |
| 7.4 | Customers ages 71 and older/Self-service stands (ATMs) | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | boi_TI:x172 |
| 7.5 | Customers ages 71 and older/Teller at branch | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | boi_TI:x172 |
| 7.6 | Customers ages 71 and older/Total | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | boi_TI:x172 |
| 8.1 | Total accounts in which an identified entry was made/E-banking channels | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | N/A |
| 8.2 | Total accounts in which an identified entry was made/Website | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | N/A |
| 8.3 | Total accounts in which an identified entry was made/Application | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | N/A |
| 8.4 | Total accounts in which an identified entry was made/Self-service stands (ATMs) | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | N/A |
| 8.5 | Total accounts in which an identified entry was made/Teller at branch | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | N/A |
| 8.6 | Total accounts in which an identified entry was made/Total | boi_met:ii1390 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | N/A |
| r12.1 | of which: accounts in which there was activity/E-banking channels | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | N/A |
| r12.2 | of which: accounts in which there was activity/Website | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | N/A |
| r12.3 | of which: accounts in which there was activity/Application | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | N/A |
| r12.4 | of which: accounts in which there was activity/Self-service stands (ATMs) | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | N/A |
| r12.5 | of which: accounts in which there was activity/Teller at branch | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | N/A |
| r12.6 | of which: accounts in which there was activity/Total | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | N/A |
| 9.1 | Customers up to age 25/E-banking channels | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | boi_TI:x169 |
| 9.2 | Customers up to age 25/Website | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | boi_TI:x169 |
| 9.3 | Customers up to age 25/Application | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | boi_TI:x169 |
| 9.4 | Customers up to age 25/Self-service stands (ATMs) | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | boi_TI:x169 |
| 9.5 | Customers up to age 25/Teller at branch | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | boi_TI:x169 |
| 9.6 | Customers up to age 25/Total | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | boi_TI:x169 |
| 10.1 | Customers ages 26-50/E-banking channels | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | boi_TI:x170 |
| 10.2 | Customers ages 26-50/Website | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | boi_TI:x170 |
| 10.3 | Customers ages 26-50/Application | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | boi_TI:x170 |
| 10.4 | Customers ages 26-50/Self-service stands (ATMs) | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | boi_TI:x170 |
| 10.5 | Customers ages 26-50/Teller at branch | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | boi_TI:x170 |
| 10.6 | Customers ages 26-50/Total | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | boi_TI:x170 |
| 11.1 | Customers ages 51-70/E-banking channels | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | boi_TI:x171 |
| 11.2 | Customers ages 51-70/Website | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | boi_TI:x171 |
| 11.3 | Customers ages 51-70/Application | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | boi_TI:x171 |
| 11.4 | Customers ages 51-70/Self-service stands (ATMs) | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | boi_TI:x171 |
| 11.5 | Customers ages 51-70/Teller at branch | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | boi_TI:x171 |
| 11.6 | Customers ages 51-70/Total | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | boi_TI:x171 |
| 12.1 | Customers ages 71 and older/E-banking channels | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | boi_TI:x172 |
| 12.2 | Customers ages 71 and older/Website | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | boi_TI:x172 |
| 12.3 | Customers ages 71 and older/Application | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | boi_TI:x172 |
| 12.4 | Customers ages 71 and older/Self-service stands (ATMs) | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | boi_TI:x172 |
| 12.5 | Customers ages 71 and older/Teller at branch | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | boi_TI:x172 |
| 12.6 | Customers ages 71 and older/Total | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | boi_TI:x172 |
| 13.1 | Total accounts in which there was activity/E-banking channels | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1155 | boi_SE:x307 | N/A |
| 13.2 | Total accounts in which there was activity/Website | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1156 | boi_SE:x307 | N/A |
| 13.3 | Total accounts in which there was activity/Application | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1157 | boi_SE:x307 | N/A |
| 13.4 | Total accounts in which there was activity/Self-service stands (ATMs) | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x1158 | boi_SE:x307 | N/A |
| 13.5 | Total accounts in which there was activity/Teller at branch | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x807 | boi_SE:x307 | N/A |
| 13.6 | Total accounts in which there was activity/Total | boi_met:ii1391 | xbrli:integerItemType | instant | boi_CS:x1 | boi_GA:x1 | boi_MC:x806 | boi_SE:x307 | N/A |