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Address	Label	Metrics	Data Type	Period Type	boi_dim:BCC	boi_dim:CNN	boi_dim:CSC	boi_dim:IPR	boi_dim:MCC	boi_dim:RPC	boi_dim:RPH	boi_dim:SEC
r0.1	label_boi_a2/Balance at balance sheet date				N/A	N/A	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	N/A	N/A
r0.2	label_boi_a2/Highest balance during the year - on the basis of all month-end balances				N/A	N/A	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	boi_RP:x30	N/A
r0.3	label_boi_a2/Balance at balance sheet date				N/A	N/A	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	N/A	N/A
r0.4	label_boi_a2/Highest balance during the year - on the basis of all month-end balances				N/A	N/A	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	boi_RP:x30	N/A
r0.5	label_boi_a2/Balance at balance sheet date				N/A	N/A	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	N/A	N/A
r0.6	label_boi_a2/Highest balance during the year - on the basis of all month-end balances				N/A	N/A	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	boi_RP:x30	N/A
r0.7	label_boi_a2/Total				N/A	N/A	boi_CS:x2	boi_IP:x8	N/A	boi_RP:x24	N/A	N/A
r1.1	Assets:/Balance at balance sheet date				boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	N/A	N/A
r1.2	Assets:/Highest balance during the year - on the basis of all month-end balances				boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	boi_RP:x30	N/A
r1.3	Assets:/Balance at balance sheet date				boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	N/A	N/A
r1.4	Assets:/Highest balance during the year - on the basis of all month-end balances				boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	boi_RP:x30	N/A
r1.5	Assets:/Balance at balance sheet date				boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	N/A	N/A
r1.6	Assets:/Highest balance during the year - on the basis of all month-end balances				boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	boi_RP:x30	N/A
r1.7	Assets:/Total				boi_BC:x1	N/A	boi_CS:x2	boi_IP:x8	N/A	boi_RP:x24	N/A	N/A
1.1	Deposits in banks/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x1
1.2	Deposits in banks/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x1
1.3	Deposits in banks/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x1
1.4	Deposits in banks/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x1
1.5	Deposits in banks/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x1
1.6	Deposits in banks/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x1
1.7	Deposits in banks/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x8	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x1
2.1	Securitization/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x29	boi_RP:x24	N/A	N/A
2.2	Securitization/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x29	boi_RP:x24	boi_RP:x30	N/A
2.3	Securitization/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x29	boi_RP:x24	N/A	N/A
2.4	Securitization/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x29	boi_RP:x24	boi_RP:x30	N/A
2.5	Securitization/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x29	boi_RP:x24	N/A	N/A
2.6	Securitization/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x29	boi_RP:x24	boi_RP:x30	N/A
2.7	Securitization/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x8	boi_MC:x29	boi_RP:x24	N/A	N/A
3.1	Securitization borrowed or purchased under agreements to resell/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x28	boi_RP:x24	N/A	N/A
3.2	Securitization borrowed or purchased under agreements to resell/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x28	boi_RP:x24	boi_RP:x30	N/A
3.3	Securitization borrowed or purchased under agreements to resell/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x28	boi_RP:x24	N/A	N/A
3.4	Securitization borrowed or purchased under agreements to resell/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x28	boi_RP:x24	boi_RP:x30	N/A
3.5	Securitization borrowed or purchased under agreements to resell/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x28	boi_RP:x24	N/A	N/A
3.6	Securitization borrowed or purchased under agreements to resell/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x28	boi_RP:x24	boi_RP:x30	N/A
3.7	Securitization borrowed or purchased under agreements to resell/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x8	boi_MC:x28	boi_RP:x24	N/A	N/A
4.1	Credit to the public/Balance at balance sheet date	boi_met:mi2	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x16
4.2	Credit to the public/Highest balance during the year - on the basis of all month-end balances	boi_met:mi2	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x16
4.3	Credit to the public/Balance at balance sheet date	boi_met:mi2	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x16
4.4	Credit to the public/Highest balance during the year - on the basis of all month-end balances	boi_met:mi2	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x16
4.5	Credit to the public/Balance at balance sheet date	boi_met:mi2	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x16
4.6	Credit to the public/Highest balance during the year - on the basis of all month-end balances	boi_met:mi2	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x16
4.7	Credit to the public/Total	boi_met:mi2	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x8	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x16
5.1	Provision for credit losses/Balance at balance sheet date	boi_met:mi3	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x16
5.2	Provision for credit losses/Highest balance during the year - on the basis of all month-end balances	boi_met:mi3	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x16
5.3	Provision for credit losses/Balance at balance sheet date	boi_met:mi3	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x16
5.4	Provision for credit losses/Highest balance during the year - on the basis of all month-end balances	boi_met:mi3	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x16
5.5	Provision for credit losses/Balance at balance sheet date	boi_met:mi3	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x16
5.6	Provision for credit losses/Highest balance during the year - on the basis of all month-end balances	boi_met:mi3	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x16
5.7	Provision for credit losses/Total	boi_met:mi3	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x8	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x16
6.1	Credit to the public, net/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x16
6.2	Credit to the public, net/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x16
6.3	Credit to the public, net/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x16
6.4	Credit to the public, net/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x16
6.5	Credit to the public, net/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x16
6.6	Credit to the public, net/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x16
6.7	Credit to the public, net/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x8	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x16
7.1	Investments in affiliated companies/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x54	boi_RP:x24	N/A	N/A
7.2	Investments in affiliated companies/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x54	boi_RP:x24	boi_RP:x30	N/A
7.3	Investments in affiliated companies/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x54	boi_RP:x24	N/A	N/A
7.4	Investments in affiliated companies/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x54	boi_RP:x24	boi_RP:x30	N/A
7.5	Investments in affiliated companies/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x54	boi_RP:x24	N/A	N/A
7.6	Investments in affiliated companies/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x54	boi_RP:x24	boi_RP:x30	N/A
7.7	Investments in affiliated companies/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x8	boi_MC:x54	boi_RP:x24	N/A	N/A
8.1	Other assets - other debtors and debit balances/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x846	boi_RP:x24	N/A	N/A
8.2	Other assets - other debtors and debit balances/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x846	boi_RP:x24	boi_RP:x30	N/A
8.3	Other assets - other debtors and debit balances/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x846	boi_RP:x24	N/A	N/A
8.4	Other assets - other debtors and debit balances/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x846	boi_RP:x24	boi_RP:x30	N/A
8.5	Other assets - other debtors and debit balances/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x846	boi_RP:x24	N/A	N/A
8.6	Other assets - other debtors and debit balances/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x846	boi_RP:x24	boi_RP:x30	N/A
8.7	Other assets - other debtors and debit balances/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x8	boi_MC:x846	boi_RP:x24	N/A	N/A
9.1	Total assets/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x1	boi_RP:x24	N/A	N/A
9.2	Total assets/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x1	boi_RP:x24	boi_RP:x30	N/A
9.3	Total assets/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x1	boi_RP:x24	N/A	N/A
9.4	Total assets/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x1	boi_RP:x24	boi_RP:x30	N/A
9.5	Total assets/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x1	boi_RP:x24	N/A	N/A
9.6	Total assets/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x1	boi_RP:x24	boi_RP:x30	N/A
9.7	Total assets/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	N/A	boi_CS:x2	boi_IP:x8	boi_MC:x1	boi_RP:x24	N/A	N/A
r11.1	Liabilities/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	N/A	N/A
r11.2	Liabilities/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	boi_RP:x30	N/A
r11.3	Liabilities/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	N/A	N/A
r11.4	Liabilities/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	boi_RP:x30	N/A
r11.5	Liabilities/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	N/A	N/A
r11.6	Liabilities/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	boi_RP:x30	N/A
r11.7	Liabilities/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x8	N/A	boi_RP:x24	N/A	N/A
10.1	Deposits of the public/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x16
10.2	Deposits of the public/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x17	boi_RP:x24	boi_RP:x30	boi_SE:x16
10.3	Deposits of the public/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x16
10.4	Deposits of the public/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x17	boi_RP:x24	boi_RP:x30	boi_SE:x16
10.5	Deposits of the public/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x16
10.6	Deposits of the public/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x17	boi_RP:x24	boi_RP:x30	boi_SE:x16
10.7	Deposits of the public/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x8	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x16
11.1	Deposits from banks/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x1
11.2	Deposits from banks/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x17	boi_RP:x24	boi_RP:x30	boi_SE:x1
11.3	Deposits from banks/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x1
11.4	Deposits from banks/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x17	boi_RP:x24	boi_RP:x30	boi_SE:x1
11.5	Deposits from banks/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x1
11.6	Deposits from banks/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x17	boi_RP:x24	boi_RP:x30	boi_SE:x1
11.7	Deposits from banks/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x8	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x1
12.1	Securitization borrowed or purchased under agreements to resell/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x28	boi_RP:x24	N/A	N/A
12.2	Securitization borrowed or purchased under agreements to resell/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x28	boi_RP:x24	boi_RP:x30	N/A
12.3	Securitization borrowed or purchased under agreements to resell/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x28	boi_RP:x24	N/A	N/A
12.4	Securitization borrowed or purchased under agreements to resell/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x28	boi_RP:x24	boi_RP:x30	N/A
12.5	Securitization borrowed or purchased under agreements to resell/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x28	boi_RP:x24	N/A	N/A
12.6	Securitization borrowed or purchased under agreements to resell/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x28	boi_RP:x24	boi_RP:x30	N/A
12.7	Securitization borrowed or purchased under agreements to resell/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x8	boi_MC:x28	boi_RP:x24	N/A	N/A
13.1	Bonds and subordinated notes/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x15	boi_RP:x24	N/A	N/A
13.2	Bonds and subordinated notes/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x15	boi_RP:x24	boi_RP:x30	N/A
13.3	Bonds and subordinated notes/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x15	boi_RP:x24	N/A	N/A
13.4	Bonds and subordinated notes/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x15	boi_RP:x24	boi_RP:x30	N/A
13.5	Bonds and subordinated notes/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x15	boi_RP:x24	N/A	N/A
13.6	Bonds and subordinated notes/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x15	boi_RP:x24	boi_RP:x30	N/A
13.7	Bonds and subordinated notes/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x8	boi_MC:x15	boi_RP:x24	N/A	N/A
14.1	Other liabilities - other payables and credit balances/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x472	boi_RP:x24	N/A	N/A
14.2	Other liabilities - other payables and credit balances/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x472	boi_RP:x24	boi_RP:x30	N/A
14.3	Other liabilities - other payables and credit balances/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x472	boi_RP:x24	N/A	N/A
14.4	Other liabilities - other payables and credit balances/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x472	boi_RP:x24	boi_RP:x30	N/A
14.5	Other liabilities - other payables and credit balances/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x472	boi_RP:x24	N/A	N/A
14.6	Other liabilities - other payables and credit balances/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x472	boi_RP:x24	boi_RP:x30	N/A
14.7	Other liabilities - other payables and credit balances/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x8	boi_MC:x472	boi_RP:x24	N/A	N/A
15.1	Total liabilities/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x3	boi_RP:x24	N/A	N/A
15.2	Total liabilities/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x9	boi_MC:x3	boi_RP:x24	boi_RP:x30	N/A
15.3	Total liabilities/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x3	boi_RP:x24	N/A	N/A
15.4	Total liabilities/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x22	boi_MC:x3	boi_RP:x24	boi_RP:x30	N/A
15.5	Total liabilities/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x3	boi_RP:x24	N/A	N/A
15.6	Total liabilities/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x25	boi_MC:x3	boi_RP:x24	boi_RP:x30	N/A
15.7	Total liabilities/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	N/A	boi_CS:x2	boi_IP:x8	boi_MC:x3	boi_RP:x24	N/A	N/A
16.1	Shares (included in shareholders equity)/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x3	boi_CN:x1	boi_CS:x2	boi_IP:x9	boi_MC:x2	boi_RP:x24	N/A	N/A
16.2	Shares (included in shareholders equity)/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x3	boi_CN:x1	boi_CS:x2	boi_IP:x9	boi_MC:x2	boi_RP:x24	boi_RP:x30	N/A
16.3	Shares (included in shareholders equity)/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x3	boi_CN:x1	boi_CS:x2	boi_IP:x22	boi_MC:x2	boi_RP:x24	N/A	N/A
16.4	Shares (included in shareholders equity)/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x3	boi_CN:x1	boi_CS:x2	boi_IP:x22	boi_MC:x2	boi_RP:x24	boi_RP:x30	N/A
16.5	Shares (included in shareholders equity)/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x3	boi_CN:x1	boi_CS:x2	boi_IP:x25	boi_MC:x2	boi_RP:x24	N/A	N/A
16.6	Shares (included in shareholders equity)/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x3	boi_CN:x1	boi_CS:x2	boi_IP:x25	boi_MC:x2	boi_RP:x24	boi_RP:x30	N/A
16.7	Shares (included in shareholders equity)/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x3	boi_CN:x1	boi_CS:x2	boi_IP:x8	boi_MC:x2	boi_RP:x24	N/A	N/A
17.1	Credit risk in of balance sheet financial lnstruments/Balance at balance sheet date	boi_met:mi187	xbrli:monetaryItemType	instant	N/A	N/A	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	N/A	N/A
17.2	Credit risk in of balance sheet financial lnstruments/Highest balance during the year - on the basis of all month-end balances	boi_met:mi187	xbrli:monetaryItemType	instant	N/A	N/A	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	boi_RP:x30	N/A
17.3	Credit risk in of balance sheet financial lnstruments/Balance at balance sheet date	boi_met:mi187	xbrli:monetaryItemType	instant	N/A	N/A	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	N/A	N/A
17.4	Credit risk in of balance sheet financial lnstruments/Highest balance during the year - on the basis of all month-end balances	boi_met:mi187	xbrli:monetaryItemType	instant	N/A	N/A	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	boi_RP:x30	N/A
17.5	Credit risk in of balance sheet financial lnstruments/Balance at balance sheet date	boi_met:mi187	xbrli:monetaryItemType	instant	N/A	N/A	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	N/A	N/A
17.6	Credit risk in of balance sheet financial lnstruments/Highest balance during the year - on the basis of all month-end balances	boi_met:mi187	xbrli:monetaryItemType	instant	N/A	N/A	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	boi_RP:x30	N/A
17.7	Credit risk in of balance sheet financial lnstruments/Total	boi_met:mi187	xbrli:monetaryItemType	instant	N/A	N/A	boi_CS:x2	boi_IP:x8	N/A	boi_RP:x24	N/A	N/A