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Address	Label	Metrics	Data Type	Period Type	boi_dim:BCC	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	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	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	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	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	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	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	boi_RP:x30	N/A
r0.7	label_boi_a2/Total				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_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	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_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	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_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	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_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	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_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	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_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	boi_RP:x30	N/A
r1.7	Assets/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x8	N/A	boi_RP:x24	N/A	N/A
1.1	Bank deposits/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x9	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x1
1.2	Bank deposits/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x9	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x1
1.3	Bank deposits/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x22	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x1
1.4	Bank deposits/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x22	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x1
1.5	Bank deposits/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x25	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x1
1.6	Bank deposits/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x25	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x1
1.7	Bank deposits/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x8	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x1
2.1	Sums receivable on account of credit card activity, net/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x9	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x89
2.2	Sums receivable on account of credit card activity, net/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x9	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x89
2.3	Sums receivable on account of credit card activity, net/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x22	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x89
2.4	Sums receivable on account of credit card activity, net/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x22	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x89
2.5	Sums receivable on account of credit card activity, net/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x25	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x89
2.6	Sums receivable on account of credit card activity, net/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x25	boi_MC:x8	boi_RP:x24	boi_RP:x30	boi_SE:x89
2.7	Sums receivable on account of credit card activity, net/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x8	boi_MC:x8	boi_RP:x24	N/A	boi_SE:x89
3.1	Securities/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x9	boi_MC:x29	boi_RP:x24	N/A	N/A
3.2	Securities/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x9	boi_MC:x29	boi_RP:x24	boi_RP:x30	N/A
3.3	Securities/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x22	boi_MC:x29	boi_RP:x24	N/A	N/A
3.4	Securities/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x22	boi_MC:x29	boi_RP:x24	boi_RP:x30	N/A
3.5	Securities/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x25	boi_MC:x29	boi_RP:x24	N/A	N/A
3.6	Securities/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x25	boi_MC:x29	boi_RP:x24	boi_RP:x30	N/A
3.7	Securities/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x8	boi_MC:x29	boi_RP:x24	N/A	N/A
4.1	Securities borrowed or acquired under repurchase agreements/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x9	boi_MC:x28	boi_RP:x24	N/A	N/A
4.2	Securities borrowed or acquired under repurchase agreements/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x9	boi_MC:x28	boi_RP:x24	boi_RP:x30	N/A
4.3	Securities borrowed or acquired under repurchase agreements/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x22	boi_MC:x28	boi_RP:x24	N/A	N/A
4.4	Securities borrowed or acquired under repurchase agreements/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x22	boi_MC:x28	boi_RP:x24	boi_RP:x30	N/A
4.5	Securities borrowed or acquired under repurchase agreements/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x25	boi_MC:x28	boi_RP:x24	N/A	N/A
4.6	Securities borrowed or acquired under repurchase agreements/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x25	boi_MC:x28	boi_RP:x24	boi_RP:x30	N/A
4.7	Securities borrowed or acquired under repurchase agreements/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x8	boi_MC:x28	boi_RP:x24	N/A	N/A
5.1	Investments in included companies/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x9	boi_MC:x54	boi_RP:x24	N/A	N/A
5.2	Investments in included companies/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x9	boi_MC:x54	boi_RP:x24	boi_RP:x30	N/A
5.3	Investments in included companies/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x22	boi_MC:x54	boi_RP:x24	N/A	N/A
5.4	Investments in included companies/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x22	boi_MC:x54	boi_RP:x24	boi_RP:x30	N/A
5.5	Investments in included companies/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x25	boi_MC:x54	boi_RP:x24	N/A	N/A
5.6	Investments in included companies/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x25	boi_MC:x54	boi_RP:x24	boi_RP:x30	N/A
5.7	Investments in included companies/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x8	boi_MC:x54	boi_RP:x24	N/A	N/A
6.1	Other assets - other sums receivable and debit balances/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x9	boi_MC:x987	boi_RP:x24	N/A	N/A
6.2	Other assets - other sums receivable 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	boi_CS:x2	boi_IP:x9	boi_MC:x987	boi_RP:x24	boi_RP:x30	N/A
6.3	Other assets - other sums receivable and debit balances/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x22	boi_MC:x987	boi_RP:x24	N/A	N/A
6.4	Other assets - other sums receivable 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	boi_CS:x2	boi_IP:x22	boi_MC:x987	boi_RP:x24	boi_RP:x30	N/A
6.5	Other assets - other sums receivable and debit balances/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x25	boi_MC:x987	boi_RP:x24	N/A	N/A
6.6	Other assets - other sums receivable 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	boi_CS:x2	boi_IP:x25	boi_MC:x987	boi_RP:x24	boi_RP:x30	N/A
6.7	Other assets - other sums receivable and debit balances/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x8	boi_MC:x987	boi_RP:x24	N/A	N/A
7.1	Total assets/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	N/A	N/A
7.2	Total assets/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	boi_RP:x30	N/A
7.3	Total assets/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	N/A	N/A
7.4	Total assets/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	boi_RP:x30	N/A
7.5	Total assets/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	N/A	N/A
7.6	Total assets/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	boi_RP:x30	N/A
7.7	Total assets/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x1	boi_CS:x2	boi_IP:x8	N/A	boi_RP:x24	N/A	N/A
r9.1	Liabilities/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	N/A	N/A
r9.2	Liabilities/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	boi_RP:x30	N/A
r9.3	Liabilities/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	N/A	N/A
r9.4	Liabilities/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	boi_RP:x30	N/A
r9.5	Liabilities/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	N/A	N/A
r9.6	Liabilities/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	boi_RP:x30	N/A
r9.7	Liabilities/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x8	N/A	boi_RP:x24	N/A	N/A
8.1	Credit from banking corporations/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x9	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x1
8.2	Credit from banking corporations/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x9	boi_MC:x17	boi_RP:x24	boi_RP:x30	boi_SE:x1
8.3	Credit from banking corporations/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x22	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x1
8.4	Credit from banking corporations/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x22	boi_MC:x17	boi_RP:x24	boi_RP:x30	boi_SE:x1
8.5	Credit from banking corporations/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x25	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x1
8.6	Credit from banking corporations/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x25	boi_MC:x17	boi_RP:x24	boi_RP:x30	boi_SE:x1
8.7	Credit from banking corporations/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x8	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x1
9.1	Sums payable on account of credit card activity/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x9	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x89
9.2	Sums payable on account of credit card activity/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x9	boi_MC:x17	boi_RP:x24	boi_RP:x30	boi_SE:x89
9.3	Sums payable on account of credit card activity/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x22	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x89
9.4	Sums payable on account of credit card activity/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x22	boi_MC:x17	boi_RP:x24	boi_RP:x30	boi_SE:x89
9.5	Sums payable on account of credit card activity/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x25	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x89
9.6	Sums payable on account of credit card activity/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x25	boi_MC:x17	boi_RP:x24	boi_RP:x30	boi_SE:x89
9.7	Sums payable on account of credit card activity/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x8	boi_MC:x17	boi_RP:x24	N/A	boi_SE:x89
10.1	Securities lent or sold under repurchase agreements/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x9	boi_MC:x28	boi_RP:x24	N/A	N/A
10.2	Securities lent or sold under repurchase agreements/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x9	boi_MC:x28	boi_RP:x24	boi_RP:x30	N/A
10.3	Securities lent or sold under repurchase agreements/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x22	boi_MC:x28	boi_RP:x24	N/A	N/A
10.4	Securities lent or sold under repurchase agreements/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x22	boi_MC:x28	boi_RP:x24	boi_RP:x30	N/A
10.5	Securities lent or sold under repurchase agreements/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x25	boi_MC:x28	boi_RP:x24	N/A	N/A
10.6	Securities lent or sold under repurchase agreements/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x25	boi_MC:x28	boi_RP:x24	boi_RP:x30	N/A
10.7	Securities lent or sold under repurchase agreements/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x8	boi_MC:x28	boi_RP:x24	N/A	N/A
11.1	Bonds and subordinated capital notes/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x9	boi_MC:x15	boi_RP:x24	N/A	N/A
11.2	Bonds and subordinated capital notes/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x9	boi_MC:x15	boi_RP:x24	boi_RP:x30	N/A
11.3	Bonds and subordinated capital notes/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x22	boi_MC:x15	boi_RP:x24	N/A	N/A
11.4	Bonds and subordinated capital notes/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x22	boi_MC:x15	boi_RP:x24	boi_RP:x30	N/A
11.5	Bonds and subordinated capital notes/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x25	boi_MC:x15	boi_RP:x24	N/A	N/A
11.6	Bonds and subordinated capital notes/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x25	boi_MC:x15	boi_RP:x24	boi_RP:x30	N/A
11.7	Bonds and subordinated capital notes/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x8	boi_MC:x15	boi_RP:x24	N/A	N/A
12.1	Other liabilities other sums payable and credit balances/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x9	boi_MC:x472	boi_RP:x24	N/A	N/A
12.2	Other liabilities other sums payable 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	boi_CS:x2	boi_IP:x9	boi_MC:x472	boi_RP:x24	boi_RP:x30	N/A
12.3	Other liabilities other sums payable and credit balances/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x22	boi_MC:x472	boi_RP:x24	N/A	N/A
12.4	Other liabilities other sums payable 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	boi_CS:x2	boi_IP:x22	boi_MC:x472	boi_RP:x24	boi_RP:x30	N/A
12.5	Other liabilities other sums payable and credit balances/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x25	boi_MC:x472	boi_RP:x24	N/A	N/A
12.6	Other liabilities other sums payable 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	boi_CS:x2	boi_IP:x25	boi_MC:x472	boi_RP:x24	boi_RP:x30	N/A
12.7	Other liabilities other sums payable and credit balances/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x8	boi_MC:x472	boi_RP:x24	N/A	N/A
13.1	Total liabilities/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	N/A	N/A
13.2	Total liabilities/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	boi_RP:x30	N/A
13.3	Total liabilities/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	N/A	N/A
13.4	Total liabilities/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	boi_RP:x30	N/A
13.5	Total liabilities/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	N/A	N/A
13.6	Total liabilities/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	boi_RP:x30	N/A
13.7	Total liabilities/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x2	boi_CS:x2	boi_IP:x8	N/A	boi_RP:x24	N/A	N/A
14.1	Shares (included in equity)/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x3	boi_CS:x2	boi_IP:x9	boi_MC:x405	boi_RP:x24	N/A	N/A
14.2	Shares (included in equity)/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x3	boi_CS:x2	boi_IP:x9	boi_MC:x405	boi_RP:x24	boi_RP:x30	N/A
14.3	Shares (included in equity)/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x3	boi_CS:x2	boi_IP:x22	boi_MC:x405	boi_RP:x24	N/A	N/A
14.4	Shares (included in equity)/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x3	boi_CS:x2	boi_IP:x22	boi_MC:x405	boi_RP:x24	boi_RP:x30	N/A
14.5	Shares (included in equity)/Balance at balance sheet date	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x3	boi_CS:x2	boi_IP:x25	boi_MC:x405	boi_RP:x24	N/A	N/A
14.6	Shares (included in equity)/Highest balance during the year - on the basis of all month-end balances	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x3	boi_CS:x2	boi_IP:x25	boi_MC:x405	boi_RP:x24	boi_RP:x30	N/A
14.7	Shares (included in equity)/Total	boi_met:mi1	xbrli:monetaryItemType	instant	boi_BC:x3	boi_CS:x2	boi_IP:x8	boi_MC:x405	boi_RP:x24	N/A	N/A
15.1	Credit risk in off-balance-sheet financial instruments/Balance at balance sheet date	boi_met:mi187	xbrli:monetaryItemType	instant	N/A	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	N/A	N/A
15.2	Credit risk in off-balance-sheet financial instruments/Highest balance during the year - on the basis of all month-end balances	boi_met:mi187	xbrli:monetaryItemType	instant	N/A	boi_CS:x2	boi_IP:x9	N/A	boi_RP:x24	boi_RP:x30	N/A
15.3	Credit risk in off-balance-sheet financial instruments/Balance at balance sheet date	boi_met:mi187	xbrli:monetaryItemType	instant	N/A	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	N/A	N/A
15.4	Credit risk in off-balance-sheet financial instruments/Highest balance during the year - on the basis of all month-end balances	boi_met:mi187	xbrli:monetaryItemType	instant	N/A	boi_CS:x2	boi_IP:x22	N/A	boi_RP:x24	boi_RP:x30	N/A
15.5	Credit risk in off-balance-sheet financial instruments/Balance at balance sheet date	boi_met:mi187	xbrli:monetaryItemType	instant	N/A	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	N/A	N/A
15.6	Credit risk in off-balance-sheet financial instruments/Highest balance during the year - on the basis of all month-end balances	boi_met:mi187	xbrli:monetaryItemType	instant	N/A	boi_CS:x2	boi_IP:x25	N/A	boi_RP:x24	boi_RP:x30	N/A
15.7	Credit risk in off-balance-sheet financial instruments/Total	boi_met:mi187	xbrli:monetaryItemType	instant	N/A	boi_CS:x2	boi_IP:x8	N/A	boi_RP:x24	N/A	N/A