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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.