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Financial Risk (Details) - Loans at amortized cost - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Credit risk      
Total $ 4,911,397 $ 5,892,997  
Cost [member]      
Credit risk      
Total 4,911,397 5,892,997  
Loss allowance      
Credit risk      
Total (41,165) (99,307) $ 100,785
Stage 3 | Loss allowance      
Credit risk      
Total (4,588) (54,573) 49,439
Stage 1 | Loss allowance      
Credit risk      
Total (16,661) (28,892) 34,957
Stage 2 | Stage 2 | Loss allowance      
Credit risk      
Total (19,916) (15,842) $ 16,389
Credit risk      
Credit risk      
Total 4,870,232 5,793,690  
Credit risk | Cost [member]      
Credit risk      
Total 4,911,397 5,892,997  
Credit risk | Loss allowance      
Credit risk      
Total (41,165) (99,307)  
Credit risk | Grade 1 - 4 | 0.03 - 0.74 | Cost [member]      
Credit risk      
Total 2,582,794 2,928,401  
Credit risk | Grade 5 - 6 | 0.75 - 3.95 | Cost [member]      
Credit risk      
Total 2,096,138 2,415,323  
Credit risk | Grade 7 - 8 | 3.96 - 30.67 | Cost [member]      
Credit risk      
Total 232,465 487,428  
Credit risk | Grade 9 - 10 | 30.68 - 100 | Cost [member]      
Credit risk      
Total   61,845  
Credit risk | Stage 3      
Credit risk      
Total 6,005 7,272  
Credit risk | Stage 3 | Cost [member]      
Credit risk      
Total 10,593 61,845  
Credit risk | Stage 3 | Loss allowance      
Credit risk      
Total (4,588) (54,573)  
Credit risk | Stage 3 | Grade 7 - 8 | 3.96 - 30.67 | Cost [member]      
Credit risk      
Total 10,593    
Credit risk | Stage 3 | Grade 9 - 10 | 30.68 - 100 | Cost [member]      
Credit risk      
Total   61,845  
Credit risk | Stage 1      
Credit risk      
Total 4,596,807 5,573,265  
Credit risk | Stage 1 | Cost [member]      
Credit risk      
Total 4,613,468 5,602,157  
Credit risk | Stage 1 | Loss allowance      
Credit risk      
Total (16,661) (28,892)  
Credit risk | Stage 1 | Grade 1 - 4 | 0.03 - 0.74 | Cost [member]      
Credit risk      
Total 2,582,794 2,928,401  
Credit risk | Stage 1 | Grade 5 - 6 | 0.75 - 3.95 | Cost [member]      
Credit risk      
Total 1,928,142 2,330,150  
Credit risk | Stage 1 | Grade 7 - 8 | 3.96 - 30.67 | Cost [member]      
Credit risk      
Total 102,532 343,606  
Credit risk | Stage 2 | Stage 2      
Credit risk      
Total 267,420 213,153  
Credit risk | Stage 2 | Stage 2 | Cost [member]      
Credit risk      
Total 287,336 228,995  
Credit risk | Stage 2 | Stage 2 | Loss allowance      
Credit risk      
Total (19,916) (15,842)  
Credit risk | Stage 2 | Stage 2 | Grade 5 - 6 | 0.75 - 3.95 | Cost [member]      
Credit risk      
Total 167,996 85,173  
Credit risk | Stage 2 | Stage 2 | Grade 7 - 8 | 3.96 - 30.67 | Cost [member]      
Credit risk      
Total $ 119,340 $ 143,822