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Financial Risk (Details 8) - 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 financial assets originated or purchased 14,967 27,840 35,353
Write-offs 5,750 0  
Securities at amortized cost      
Credit risk      
Financial assets at beginning of period 74,547    
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 financial assets originated or purchased 430 37 56
Financial assets at end of period 164,074 74,547  
Securities at FVOCI      
Credit risk      
Financial assets at beginning of period 5,094    
Net effect of changes in allowance for expected credit losses 0   (63)
Financial instruments that have been derecognized during the year 0 (173)  
New financial assets originated or purchased 43   14
Financial assets at end of period 231,348 5,094  
Loans at amortized cost      
Credit risk      
Financial assets at beginning of period 5,892,997    
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 financial assets originated or purchased 12,828 25,695 32,355
Financial assets at end of period 4,911,397 5,892,997  
Loan commitments and financial guarantees contracts      
Credit risk      
Financial assets at beginning of period 609,054    
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 financial assets originated or purchased 1,666 2,108 2,928
Financial assets at end of period 639,264 609,054  
Loss allowance | Securities at amortized cost      
Credit risk      
Financial assets at beginning of period (113) 140  
Transfer to lifetime expected credit losses 0    
Net effect of changes in allowance for expected credit losses 38 (18)  
Financial instruments that have been derecognized during the year (86) (46)  
New financial assets originated or purchased 430 37  
Financial assets at end of period (495) (113) 140
Loss allowance | Securities at FVOCI      
Credit risk      
Financial assets at beginning of period   173  
Financial instruments that have been derecognized during the year 43 (173)  
Financial assets at end of period (43)   173
Loss allowance | Loans at amortized cost      
Credit risk      
Financial assets at beginning of period (99,307) 100,785  
Transfer to lifetime expected credit losses 0    
Transfer to credit-impaired financial instruments 0    
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 financial assets originated or purchased 12,828 25,695  
Write-offs (56,532) (2,405)  
Recoveries 139 52  
Financial assets at end of period (41,165) (99,307) 100,785
Loss allowance | Loan commitments and financial guarantees contracts      
Credit risk      
Financial assets at beginning of period (3,044) 3,289  
Transfer to lifetime expected credit losses 0    
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 financial assets originated or purchased 1,666 2,108  
Financial assets at end of period (2,904) (3,044) 3,289
Stage 3 | Loss allowance | Securities at amortized cost      
Credit risk      
Financial assets at beginning of period 0    
Transfer to lifetime expected credit losses 0    
Net effect of changes in allowance for expected credit losses 0    
Financial instruments that have been derecognized during the year 0    
New financial assets originated or purchased 0    
Financial assets at end of period 0 0  
Stage 3 | Loss allowance | Loans at amortized cost      
Credit risk      
Financial assets at beginning of period (54,573) 49,439  
Transfer to lifetime expected credit losses 0    
Transfer to credit-impaired financial instruments 2,100    
Net effect of changes in allowance for expected credit losses (118) 7,987  
Financial instruments that have been derecognized during the year 0 (500)  
New financial assets originated or purchased 0    
Write-offs (52,106) (2,405)  
Recoveries 139 52  
Financial assets at end of period (4,588) (54,573) 49,439
Stage 3 | Loss allowance | Loan commitments and financial guarantees contracts      
Credit risk      
Financial assets at beginning of period 0    
Transfer to lifetime expected credit losses 0    
Net effect of changes in allowance for expected credit losses 0    
Financial instruments that have been derecognized during the year 0    
New financial assets originated or purchased 0    
Financial assets at end of period 0 0  
Stage 1 | Loss allowance | Securities at amortized cost      
Credit risk      
Financial assets at beginning of period (103) 113  
Transfer to lifetime expected credit losses (10)    
Net effect of changes in allowance for expected credit losses 15 (1)  
Financial instruments that have been derecognized during the year (76) (46)  
New financial assets originated or purchased 430 37  
Financial assets at end of period (462) (103) 113
Stage 1 | Loss allowance | Securities at FVOCI      
Credit risk      
Financial assets at beginning of period   33  
Financial instruments that have been derecognized during the year 43 (33)  
Financial assets at end of period (43)   33
Stage 1 | Loss allowance | Loans at amortized cost      
Credit risk      
Financial assets at beginning of period (28,892) 34,957  
Transfer to lifetime expected credit losses (886) (2,488)  
Transfer to credit-impaired financial instruments 0    
Net effect of changes in allowance for expected credit losses 134 (2,154)  
Financial instruments that have been derecognized during the year (24,307) (27,118)  
New financial assets originated or purchased 12,828 25,695  
Write-offs 0    
Recoveries 0    
Financial assets at end of period (16,661) (28,892) 34,957
Stage 1 | Loss allowance | Loan commitments and financial guarantees contracts      
Credit risk      
Financial assets at beginning of period (2,683) 3,089  
Transfer to lifetime expected credit losses (96)    
Net effect of changes in allowance for expected credit losses 37 (17)  
Financial instruments that have been derecognized during the year (1,864) (2,497)  
New financial assets originated or purchased 1,666 2,108  
Financial assets at end of period (2,426) (2,683) 3,089
Stage 2 | Stage 2 | Loss allowance | Securities at amortized cost      
Credit risk      
Financial assets at beginning of period (10) 27  
Transfer to lifetime expected credit losses 10    
Net effect of changes in allowance for expected credit losses 23 (17)  
Financial instruments that have been derecognized during the year (10)    
New financial assets originated or purchased 0    
Financial assets at end of period (33) (10) 27
Stage 2 | Stage 2 | Loss allowance | Securities at FVOCI      
Credit risk      
Financial assets at beginning of period   140  
Financial instruments that have been derecognized during the year   (140)  
Financial assets at end of period     140
Stage 2 | Stage 2 | Loss allowance | Loans at amortized cost      
Credit risk      
Financial assets at beginning of period (15,842) 16,389  
Transfer to lifetime expected credit losses 886 2,488  
Transfer to credit-impaired financial instruments (2,100)    
Net effect of changes in allowance for expected credit losses 13,443 5,881  
Financial instruments that have been derecognized during the year (3,729) (8,916)  
New financial assets originated or purchased 0    
Write-offs (4,426)    
Recoveries 0    
Financial assets at end of period (19,916) (15,842) 16,389
Stage 2 | Stage 2 | Loss allowance | Loan commitments and financial guarantees contracts      
Credit risk      
Financial assets at beginning of period (361) 200  
Transfer to lifetime expected credit losses 96    
Net effect of changes in allowance for expected credit losses 42 170  
Financial instruments that have been derecognized during the year (21) (9)  
New financial assets originated or purchased 0    
Financial assets at end of period $ (478) $ (361) $ 200