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Business segment information (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of operating segment [Abstract] |
Disclosure of detailed information about operations by segment [Text Block] | The following table provides certain information regarding the Bank’s operations by segment:
|  | Years ended December 31, |
|  | 2017(1) |  | 2016(1) |  | 2015(1) |
Commercial |  |  |  |  |  |  |  |  |  |
Interest income |  |  | 213,326 |  |  | 236,392 |  |  | 209,858 |
Interest expense |  |  | (92,745) |  |  | (96,017) |  |  | (82,697) |
Net interest income |  |  | 120,581 |  |  | 140,375 |  |  | 127,161 |
Net other income (2) |  |  | 18,926 |  |  | 16,333 |  |  | 21,492 |
Total income |  |  | 139,507 |  |  | 156,708 |  |  | 148,653 |
Impairment loss from expected credit losses on loans and impairment loss from expected credit losses on loan commitments and financial guarantee contracts |  |  | (9,928) |  |  | (35,112) |  |  | (12,800) |
Expenses, less impairment loss from expected credit losses |  |  | (35,916) |  |  | (34,599) |  |  | (40,429) |
Profit for the year |  |  | 93,663 |  |  | 86,997 |  |  | 95,424 |
Commercial assets and loan commitments and financial guarantee contracts (end of year balances): |  |  |  |  |  |  |  |  |  |
Interest-earning assets (3 and 5) |  |  | 5,500,673 |  |  | 6,013,482 |  |  | 6,682,445 |
Other assets and loan commitments and financial guarantee contracts (4) |  |  | 493,794 |  |  | 422,422 |  |  | 437,436 |
Total interest-earning assets, other assets and loan commitments and financial guarantee contracts |  |  | 5,994,467 |  |  | 6,435,904 |  |  | 7,119,881 |
Treasury |  |  |  |  |  |  |  |  |  |
Interest income |  |  | 12,753 |  |  | 9,506 |  |  | 10,454 |
Interest expense |  |  | (13,519) |  |  | 5,328 |  |  | 7,864 |
Net interest income |  |  | (766) |  |  | 14,834 |  |  | 18,318 |
Net other income (2) |  |  | (428) |  |  | (3,568) |  |  | 6,887 |
Total income |  |  | (1,194) |  |  | 11,266 |  |  | 25,205 |
Impairment loss for expected credit losses on investment securities |  |  | 489 |  |  | (3) |  |  | (5,290) |
Expenses, less impairment loss for expected credit losses |  |  | (10,959) |  |  | (11,216) |  |  | (11,355) |
Profit (loss) for the year |  |  | (11,664) |  |  | 47 |  |  | 8,560 |
Treasury assets (end of year balances): |  |  |  |  |  |  |  |  |  |
Interest-earning assets (3 and 5) |  |  | 757,911 |  |  | 1,177,961 |  |  | 1,603,921 |
Total interest-earning assets |  |  | 757,911 |  |  | 1,177,961 |  |  | 1,603,921 |
|  | Years ended December 31, |
|  | 2017(1) |  | 2016(1) |  | 2015(1) |
Combined business segment total |  |  |  |  |  |  |  |  |  |
Interest income |  |  | 226,079 |  |  | 245,898 |  |  | 220,312 |
Interest expense |  |  | (106,264) |  |  | (90,689) |  |  | (74,833) |
Net interest income |  |  | 119,815 |  |  | 155,209 |  |  | 145,479 |
Net other income (2) |  |  | 18,498 |  |  | 12,765 |  |  | 28,379 |
Total income |  |  | 138,313 |  |  | 167,974 |  |  | 173,858 |
Impairment loss from expected credit losses on loans and impairment loss from expected credit losses on loan commitments and financial guarantee contracts |  |  | (9,928) |  |  | (35,112) |  |  | (12,800) |
Impairment loss from expected credit losses on investment securities |  |  | 489 |  |  | (3) |  |  | (5,290) |
Expenses, less impairment loss from expected credit losses |  |  | (46,875) |  |  | (45,814) |  |  | (51,784) |
Profit for the year |  |  | 81,999 |  |  | 87,045 |  |  | 103,984 |
|  | December 31, 2017 |  | December 31, 2016 |
Total assets and loan commitments and financial guarantee contracts (end of year balances): |  |  |  |  |  |  |
Interest-earning assets (3 and 5) |  |  | 6,258,584 |  |  | 7,191,443 |
Other assets and loan commitments and financial guarantee contracts (4) |  |  | 493,794 |  |  | 422,422 |
Total interest-earning assets, other assets and loan commitments and financial guarantee contracts |  |  | 6,752,378 |  |  | 7,613,865 |
| (1) | The numbers set out in these tables have been rounded and accordingly may not total exactly.
| (2) | Net other income consists of other income including gains on sale of loans, gains (loss) per financial instrument at FVTPL and FVOCI, derivative instruments and foreign currency exchange.
| (3) | Includes deposits and loans, net of unearned interest and deferred fees.
| (4) | Includes customers’ liabilities under acceptances, loans commitments and financial guarantees contracts.
| (5) | Includes cash and cash equivalents, interest-bearing deposits with banks, financial instruments at fair value through OCI, financial instruments at amortized cost and financial instruments at fair value through profit or loss.
Disclosure of detailed information about reconciliation of total assets [Text Block] |
|  | December 31, 2017 |  | December 31, 2016 |
Reconciliation of total assets: |  |  |  |  |  |  |
Interest-earning assets – business segment |  |  | 6,258,584 |  |  | 7,191,443 |
Equity instruments |  |  | 8,402 |  |  | - |
Allowance for expected credit losses on loans |  |  | (81,294) |  |  | (105,988) |
Allowance for expected credit losses on securities at amortized cost |  |  | (196) |  |  | (602) |
Customers’ liabilities under acceptances |  |  | 6,369 |  |  | 19,387 |
Intangibles, net |  |  | 5,425 |  |  | 2,909 |
Accrued interest receivable |  |  | 30,872 |  |  | 44,187 |
Property and equipment, net |  |  | 7,420 |  |  | 8,549 |
Derivative financial instruments used for hedging - receivable |  |  | 13,338 |  |  | 9,352 |
Other assets |  |  | 18,827 |  |  | 11,546 |
Total assets – consolidated financial statements |  |  | 6,267,747 |  |  | 7,180,783 |

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