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Business segment information (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Disclosure of Reporting Segment [Line Items]      
Lease liabilities $ 18,799 $ 19,914  
Description of Percentage of Revenue that either of the segments had Exceeded As of December 31, 2020, 2019, and 2018, respectively, the Bank has no customer, either individually or as group of companies, that represents more than 10% of total revenues    
IFRS 16 [Member]      
Disclosure of Reporting Segment [Line Items]      
Right of use assets     $ 17,400
Lease liabilities     $ 20,900