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Risk management (Details Textual)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Statement of financial risk management [Line Items]    
Deposits from customers $ 2,928,844 $ 2,802,852
Deposits From Customers To Total Deposits Percentage 16.00% 8.00%
Financial assets held for managing liquidity risk $ 619 $ 1,008
Liquid Assets To Total Deposits Percentage 21.00% 36.00%
Financial assets held for managing liquidity risk deposited in bank $ 609,000 $ 591,000
Financial assets held for managing liquidity risk Percentage deposited in bank 98.00% 59.00%
Description of compliance of liquidity guidelines According to the Bank's liquidity guidelines, it is established that a minimum level of 1.0 of LCR and NSFR must be met.  
Loans and advances to customers $ 6,369 $ 19,387
Bottom of range [member]    
Statement of financial risk management [Line Items]    
Level of liquidity index 1.25 0.94
Top of range [member]    
Statement of financial risk management [Line Items]    
Level of liquidity index 1.53 2.60
Weighted Average [Member]    
Statement of financial risk management [Line Items]    
Level of liquidity index 1.42 1.15
Short Term [Member]    
Statement of financial risk management [Line Items]    
Loans and advances to customers,maruity term 203 days 184 days
Loans and advances to customers,remaining maruity term 112 days 89 days
Loans and advances to customers $ 3,746,000 $ 3,577,000
Medium Term [Member]    
Statement of financial risk management [Line Items]    
Loans and advances to customers,maruity term 4 years 45 months
Loans and advances to customers,remaining maruity term 655 days 588 days
Loans and advances to customers $ 1,872,000 $ 2,552,000
Investment Securities [Member] | Medium Term [Member]    
Statement of financial risk management [Line Items]    
Loans and advances to customers 86,000 105,000
Loans Portfolio [Member] | Medium Term [Member]    
Statement of financial risk management [Line Items]    
Loans and advances to customers 1,786,000 2,447,000
Demand and Call Deposits [Member]    
Statement of financial risk management [Line Items]    
Deposits from customers $ 478,000 $ 227,000