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Financial Risk (Details 9) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Credit risk      
Net effect of changes in allowance for expected credit losses $ 13,576 $ 11,849 $ 56,382
Financial instruments that have been derecognized during the year (30,007) (39,259) (34,220)
New instruments originated or purchased 14,967 27,840 35,353
Total (1,464) 430 57,515
Securities at amortized cost      
Credit risk      
Net effect of changes in allowance for expected credit losses 38 (18) (48)
Financial instruments that have been derecognized during the year (86) (46) (64)
New instruments originated or purchased 430 37 56
Total 382 (27) (56)
Securities at FVOCI      
Credit risk      
Net effect of changes in allowance for expected credit losses 0   (63)
Financial instruments that have been derecognized during the year 0 (173)  
New instruments originated or purchased 43   14
Total 43 (173) (49)
Loans at amortized cost      
Credit risk      
Net effect of changes in allowance for expected credit losses 13,459 11,714 56,311
Financial instruments that have been derecognized during the year (28,036) (36,534) (27,490)
New instruments originated or purchased 12,828 25,695 32,355
Total (1,749) 875 61,176
Loan commitments and financial guarantees contracts      
Credit risk      
Net effect of changes in allowance for expected credit losses 79 153 182
Financial instruments that have been derecognized during the year (1,885) (2,506) (6,666)
New instruments originated or purchased 1,666 2,108 2,928
Total (140) (245) $ (3,556)
Loss allowance | Securities at amortized cost      
Credit risk      
Net effect of changes in allowance for expected credit losses 38 (18)  
Financial instruments that have been derecognized during the year (86) (46)  
New instruments originated or purchased 430 37  
Loss allowance | Securities at FVOCI      
Credit risk      
Financial instruments that have been derecognized during the year 43 (173)  
Loss allowance | Loans at amortized cost      
Credit risk      
Net effect of changes in allowance for expected credit losses 13,459 11,714  
Financial instruments that have been derecognized during the year (28,036) (36,534)  
New instruments originated or purchased 12,828 25,695  
Loss allowance | Loan commitments and financial guarantees contracts      
Credit risk      
Net effect of changes in allowance for expected credit losses 79 153  
Financial instruments that have been derecognized during the year (1,885) (2,506)  
New instruments originated or purchased $ 1,666 $ 2,108