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Capital and Reserves (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of share capital, reserves and other equity interest [Abstract]    
Description of minimum capital adequacy ratio 8.00%  
Description of primary capital requirement 4.50%  
Description of total capital adequacy ratio 18.71%  
Reserve for credit risk coverage $ 129,254 $ 62,459