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Leases - Right-of-use assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items]    
Balance – Beginning of period $ 2,420  
Balance – End of period 2,798 $ 2,420
Premises    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance – Beginning of period 2,220  
Balance – End of period 2,671 2,220
Others    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance – Beginning of period 200  
Balance – End of period 127 200
Cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance – Beginning of period 2,999 2,406
Additions 968 640
Disposals   (76)
Effects of foreign exchange 191 29
Balance – End of period 4,158 2,999
Cost | Premises    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance – Beginning of period 2,723 2,209
Additions 968 481
Disposals   0
Effects of foreign exchange 170 33
Balance – End of period 3,861 2,723
Cost | Others    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance – Beginning of period 276 197
Additions 0 159
Disposals   (76)
Effects of foreign exchange 21 (4)
Balance – End of period 297 276
Accumulated amortization    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance – Beginning of period (579) 0
Additions (744) (599)
Disposals   29
Effects of foreign exchange (37) (9)
Balance – End of period (1,360) (579)
Accumulated amortization | Premises    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance – Beginning of period (503) 0
Additions (662) (494)
Disposals   0
Effects of foreign exchange (25) (9)
Balance – End of period (1,190) (503)
Accumulated amortization | Others    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance – Beginning of period (76) 0
Additions (82) (105)
Disposals   29
Effects of foreign exchange (12) 0
Balance – End of period $ (170) $ (76)