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Financial Risk (Details 3) - Securities at FVOCI - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Credit risk      
Total $ 231,348 $ 5,094  
Loss allowance      
Credit risk      
Total (43)   $ 173
Stage 1 | Loss allowance      
Credit risk      
Total (43)   33
Stage 2 | Stage 2 | Loss allowance      
Credit risk      
Total     $ 140
Credit risk      
Credit risk      
Total 231,305 5,094  
Credit risk | Cost [member]      
Credit risk      
Total 231,348 5,094  
Credit risk | Loss allowance      
Credit risk      
Total (43)    
Credit risk | Grade 1 - 4 | 0.03 - 0.74 | Cost [member]      
Credit risk      
Total 231,348 5,094  
Credit risk | Stage 1      
Credit risk      
Total 231,305 5,094  
Credit risk | Stage 1 | Cost [member]      
Credit risk      
Total 231,348 5,094  
Credit risk | Stage 1 | Loss allowance      
Credit risk      
Total (43)    
Credit risk | Stage 1 | Grade 1 - 4 | 0.03 - 0.74 | Cost [member]      
Credit risk      
Total $ 231,348 $ 5,094