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Financial instruments (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of financial instruments [Line Items] |  |  |  |
Unearned discount interest and deferred commission, financial assets |  | $ 4,985 | $ 7,249 |
Description of duration of hedging, financial assets |  | 6 years 2 months 8 days |  |
Interest income, Hedged loans |  | $ 610 |  |
Interest expenses, Hedge financial assets for sale of securities |  | 645 |  |
Dation In Payment Received Other Real Estate Owned Property |  | 5,119 |  |
Notional amount |  | 0 | 1,274 |
Financial assets at amortised cost | [1] | 68,934 | 77,214 |
Revenue |  |  | 76 | $ 425
Impaired Loans Fair Value |  | 19,274 |  |
Allowance account for credit losses of financial assets |  | 81,294 | $ 105,988 | 89,974
Equity investments [member] |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |
Notional amount |  | 37,817 |  |
Financial assets at amortised cost |  | $ 8,630 |  |
Fixed interest rate [member] |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |
Interest rate fluctuations of loans at amortized cost, financial assets |  | 85.00% | 93.00% |
Annual interest rate [Member] | Bottom of range [member] |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |
Interest rate fluctuations of loans at amortized cost, financial assets |  | 1.35% | 1.21% |
Annual interest rate [Member] | Top of range [member] |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |
Interest rate fluctuations of loans at amortized cost, financial assets |  | 11.52% | 12.69% |
Financial assets at amortised cost, category [member] |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |
Allowance account for credit losses of financial assets |  | $ 196 | $ 602 | $ 526
[1] | 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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