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Fair value of financial instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of fair value of financial instruments [Abstract] |
Disclosure of fair value measurement [text block] | Financial instruments measured at fair value on a recurring basis by caption on the consolidated statement of financial positions using the fair value hierarchy are described below:
|  | December 31, 2017 |
|  | Level 1(a) |  | Level 2(b) |  | Level 3(c) |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Securities at fair value through OCI: |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments |  |  | 8,402 |  |  | - |  |  | - |  |  | 8,402 |
Sovereign debt (1) |  |  | 16,733 |  |  | - |  |  | - |  |  | 16,733 |
Total securities at fair value through OCI |  |  | 25,135 |  |  | - |  |  | - |  |  | 25,135 |
Derivative financial instruments used for hedging – receivable: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  |  | - |  |  | 129 |  |  | - |  |  | 129 |
Cross-currency interest rate swaps |  |  | - |  |  | 4,550 |  |  | - |  |  | 4,550 |
Foreign exchange forward |  |  | - |  |  | 8,659 |  |  | - |  |  | 8,659 |
Total derivative financial instrument used for hedging – receivable |  |  | - |  |  | 13,338 |  |  | - |  |  | 13,338 |
Total financial assets at fair value |  |  | 25,135 |  |  | 13,338 |  |  | - |  |  | 38,473 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments used for hedging – payable: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  |  | - |  |  | 4,789 |  |  | - |  |  | 4,789 |
Cross-currency interest rate swaps |  |  | - |  |  | 30,154 |  |  | - |  |  | 30,154 |
Total derivative financial instruments used for hedging – payable |  |  | - |  |  | 34,943 |  |  | - |  |  | 34,943 |
Total financial liabilities at fair value |  |  | - |  |  | 34,943 |  |  | - |  |  | 34,943 |
| (1) | At December 31, 2017, securities at fair value through OCI for $2,955 were reclassified from level 2 to level 1 of the fair value hierarchy given that Bloomberg's valuation "BVAL" for these values increased from 7 (in 2016) to 10 (in 2017).
| (a) | Level 1: Quoted market prices in an active market.
| (b) | Level 2: Quoted market prices in an inactive market or internally developed models with significant observable market.
| (c) | Level 3: Internally developed models with significant unobservable market information.
|  | December 31, 2016 |
|  | Level 1(a) |  | Level 2(b) |  | Level 3(c) |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Securities at fair value through OCI: |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt |  |  | 13,909 |  |  | - |  |  | - |  |  | 13,909 |
Sovereign debt |  |  | 13,912 |  |  | 2,786 |  |  | - |  |  | 16,698 |
Total securities at fair value through OCI |  |  | 27,821 |  |  | 2,786 |  |  | - |  |  | 30,607 |
Derivative financial instruments used for hedging – receivable: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  |  | - |  |  | 363 |  |  | - |  |  | 363 |
Cross-currency interest rate swaps |  |  | - |  |  | 2,561 |  |  | - |  |  | 2,561 |
Foreign exchange forward |  |  | - |  |  | 6,428 |  |  | - |  |  | 6,428 |
Total derivative financial instrument used for hedging – receivable |  |  | - |  |  | 9,352 |  |  | - |  |  | 9,352 |
Total financial assets at fair value |  |  | 27,821 |  |  | 12,138 |  |  | - |  |  | 39,959 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments at FVTPL: |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange forward |  |  | - |  |  | 24 |  |  | - |  |  | 24 |
Total financial instruments at FVTPL |  |  | - |  |  | 24 |  |  | - |  |  | 24 |
Derivative financial instruments used for hedging – payable: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  |  | - |  |  | 3,704 |  |  | - |  |  | 3,704 |
Cross-currency interest rate swaps |  |  | - |  |  | 46,198 |  |  | - |  |  | 46,198 |
Foreign exchange forward |  |  | - |  |  | 9,784 |  |  | - |  |  | 9,784 |
Total derivative financial instruments used for hedging – payable |  |  | - |  |  | 59,686 |  |  | - |  |  | 59,686 |
Total financial liabilities at fair value |  |  | - |  |  | 59,710 |  |  | - |  |  | 59,710 |
| (a) | Level 1: Quoted market prices in an active market.
| (b) | Level 2: Quoted market prices in an inactive market or internally developed models with significant observable market.
| (c) | Level 3: Internally developed models with significant unobservable market information.
Disclosure of detailed information about carrying value and estimated fair value of the Bank's financial instruments that are not measured on a recurring basis [Text Block] | The following table provides information on the carrying value and estimated fair value of the Bank’s financial instruments that are not measured on a recurring basis:
|  | December 31, 2017 |
|  | Carrying value |  | Fair value |  | Level 1(a) |  | Level 2(b) |  | Level 3(c) |
Financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Instruments with carrying value that approximates fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and deposits on banks |  |  | 672,048 |  |  | 672,048 |  |  | - |  |  | 672,048 |  |  | - |
Acceptances |  |  | 6,369 |  |  | 6,369 |  |  | - |  |  | 6,369 |  |  | - |
Interest receivable |  |  | 30,872 |  |  | 30,872 |  |  | - |  |  | 30,872 |  |  | - |
Securities at amortized cost (2) |  |  | 68,934 |  |  | 69,006 |  |  | 50,581 |  |  | 8,447 |  |  | 9,978 |
Loans, net (1) |  |  | 5,419,379 |  |  | 5,520,604 |  |  | - |  |  | 5,520,604 |  |  | - |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Instruments with carrying value that approximates fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 2,928,844 |  |  | 2,928,844 |  |  | - |  |  | 2,928,844 |  |  | - |
Acceptances |  |  | 6,369 |  |  | 6,369 |  |  | - |  |  | 6,369 |  |  | - |
Interest payable |  |  | 15,816 |  |  | 15,816 |  |  | - |  |  | 15,816 |  |  | - |
Short-term borrowings and debt |  |  | 1,072,723 |  |  | 1,072,483 |  |  | - |  |  | 1,072,483 |  |  | - |
Long-term borrowings and debt, net |  |  | 1,138,844 |  |  | 1,158,534 |  |  | - |  |  | 1,158,534 |  |  | - |
| (a) | Level 1: Quoted market prices in an active market.
| (b) | Level 2: Quoted market prices in an inactive market or internally developed models with significant observable market.
| (c) | Level 3: Internally developed models with significant unobservable market information.
The following table provides information on the carrying value and estimated fair value of the Bank’s financial instruments that are not measured on a recurring basis:
|  | December 31, 2016 |
|  | Carrying value |  | Fair value |  | Level 1(a) |  | Level 2(b) |  | Level 3(c) |
Financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Instruments with carrying value that approximates fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and deposits on banks |  |  | 1,069,538 |  |  | 1,069,538 |  |  | - |  |  | 1,069,538 |  |  | - |
Acceptances |  |  | 19,387 |  |  | 19,387 |  |  | - |  |  | 19,387 |  |  | - |
Interest receivable |  |  | 44,187 |  |  | 44,187 |  |  | - |  |  | 44,187 |  |  | - |
Securities at amortized cost (2) |  |  | 77,214 |  |  | 76,406 |  |  | 73,406 |  |  | 3,000 |  |  | - |
Loans , net (1) |  |  | 5,907,494 |  |  | 6,021,006 |  |  | - |  |  | 6,021,006 |  |  | - |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Instruments with carrying value that approximates fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 2,802,852 |  |  | 2,802,852 |  |  | - |  |  | 2,802,852 |  |  | - |
Acceptances |  |  | 19,387 |  |  | 19,387 |  |  | - |  |  | 19,387 |  |  | - |
Interest payable |  |  | 16,603 |  |  | 16,603 |  |  | - |  |  | 16,603 |  |  | - |
Short-term borrowings and debt |  |  | 1,470,075 |  |  | 1,470,045 |  |  | - |  |  | 1,470,045 |  |  | - |
Long-term borrowings and debt, net |  |  | 1,776,738 |  |  | 1,808,228 |  |  | - |  |  | 1,808,228 |  |  | - |
| (a) | Level 1: Quoted market prices in an active market.
| (b) | Level 2: Quoted market prices in an inactive market or internally developed models with significant observable market.
| (c) | Level 3: Internally developed models with significant unobservable market information.
| (1) | The carrying value of loans at amortized cost is net of the allowance for expected credit losses of $81.3 million and unearned interest and deferred fees of $5.0 million for December 31, 2017; allowance for expected credit losses of $106.0 million and unearned interest and deferred fees of $7.2 million for December 31, 2016.
| (2) | The carrying value of securities at amortized cost is net of the allowance for expected credit losses of $0.2 million for December 31, 2017 and $0.6 million for December 31, 2016.

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- Definition The disclosure of detailed information about carrying value and estimated fair value of the Bank’s financial instruments that are not measured on a recurring basis. + References No definition available. + Details
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