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Financial risk - Loan commitments, financial guarantees issued and customers’ liabilities under acceptances (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Loan commitments and financial guarantee contracts      
Credit risk      
Total $ 805,274 $ 639,264  
Loan commitments and financial guarantee contracts | Costs:      
Credit risk      
Total 201,515 74,366  
Loan commitments and financial guarantee contracts | Loss allowance      
Credit risk      
Total 3,803 2,904 $ 3,044
Loan commitments and financial guarantee contracts | Stage 3 | Loss allowance      
Credit risk      
Total 0 0 0
Loan commitments and financial guarantee contracts | Stage 1 | Loss allowance      
Credit risk      
Total 3,472 2,426 2,683
Loan commitments and financial guarantee contracts | Stage 2 | Stage 2 | Loss allowance      
Credit risk      
Total 331 478 $ 361
Credit risk | Loan commitments and financial guarantee contracts      
Credit risk      
Total 801,471 636,360  
Credit risk | Loan commitments and financial guarantee contracts | Costs:      
Credit risk      
Total 805,274 639,264  
Credit risk | Loan commitments and financial guarantee contracts | Loss allowance      
Credit risk      
Total (3,803) (2,904)  
Credit risk | Loan commitments and financial guarantee contracts | Stage 3      
Credit risk      
Total 0 0  
Credit risk | Loan commitments and financial guarantee contracts | Stage 3 | Costs:      
Credit risk      
Total 0 0  
Credit risk | Loan commitments and financial guarantee contracts | Stage 3 | Loss allowance      
Credit risk      
Total 0 0  
Credit risk | Loan commitments and financial guarantee contracts | Stage 1      
Credit risk      
Total 780,402 598,392  
Credit risk | Loan commitments and financial guarantee contracts | Stage 1 | Costs:      
Credit risk      
Total 783,874 600,818  
Credit risk | Loan commitments and financial guarantee contracts | Stage 1 | Loss allowance      
Credit risk      
Total (3,472) (2,426)  
Credit risk | Loan commitments and financial guarantee contracts | Stage 2 | Stage 2      
Credit risk      
Total 21,069 37,968  
Credit risk | Loan commitments and financial guarantee contracts | Stage 2 | Stage 2 | Costs:      
Credit risk      
Total 21,400 38,446  
Credit risk | Loan commitments and financial guarantee contracts | Stage 2 | Stage 2 | Loss allowance      
Credit risk      
Total (331) (478)  
Credit risk | Commitments and contingencies | Costs:      
Credit risk      
Total 603,759 564,898  
Credit risk | Commitments and contingencies | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Total $ 257,831 $ 245,927  
Credit risk | Commitments and contingencies | Grades 1 - 4 | 0.03 - 0.74 | Costs: | Minimum of the year      
Credit risk      
PD Ranges 0.03% 0.03%  
Credit risk | Commitments and contingencies | Grades 1 - 4 | 0.03 - 0.74 | Costs: | Maximum of the year      
Credit risk      
PD Ranges 0.74% 0.74%  
Credit risk | Commitments and contingencies | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Total $ 194,393    
Credit risk | Commitments and contingencies | Grades 5 - 6 | 0.75 - 3.80 | Costs: | Minimum of the year      
Credit risk      
PD Ranges 0.75%    
Credit risk | Commitments and contingencies | Grades 5 - 6 | 0.75 - 3.80 | Costs: | Maximum of the year      
Credit risk      
PD Ranges 3.80%    
Credit risk | Commitments and contingencies | Grades 5 - 6 | 0.75 - 3.95 | Costs:      
Credit risk      
Total   $ 237,084  
Credit risk | Commitments and contingencies | Grades 5 - 6 | 0.75 - 3.95 | Costs: | Minimum of the year      
Credit risk      
PD Ranges   0.75%  
Credit risk | Commitments and contingencies | Grades 5 - 6 | 0.75 - 3.95 | Costs: | Maximum of the year      
Credit risk      
PD Ranges   3.95%  
Credit risk | Commitments and contingencies | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Total $ 151,535    
Credit risk | Commitments and contingencies | Grades 7 - 8 | 3.81 - 34.51 | Costs: | Minimum of the year      
Credit risk      
PD Ranges 3.81%    
Credit risk | Commitments and contingencies | Grades 7 - 8 | 3.81 - 34.51 | Costs: | Maximum of the year      
Credit risk      
PD Ranges 34.51%    
Credit risk | Commitments and contingencies | Grades 7 - 8 | 3.96 - 30.67 | Costs:      
Credit risk      
Total   $ 81,887  
Credit risk | Commitments and contingencies | Grades 7 - 8 | 3.96 - 30.67 | Costs: | Minimum of the year      
Credit risk      
PD Ranges   3.96%  
Credit risk | Commitments and contingencies | Grades 7 - 8 | 3.96 - 30.67 | Costs: | Maximum of the year      
Credit risk      
PD Ranges   30.67%  
Credit risk | Commitments and contingencies | Stage 3 | Costs:      
Credit risk      
Total $ 0 $ 0  
Credit risk | Commitments and contingencies | Stage 3 | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Total 0 0  
Credit risk | Commitments and contingencies | Stage 3 | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Total 0    
Credit risk | Commitments and contingencies | Stage 3 | Grades 5 - 6 | 0.75 - 3.95 | Costs:      
Credit risk      
Total   0  
Credit risk | Commitments and contingencies | Stage 3 | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Total 0    
Credit risk | Commitments and contingencies | Stage 3 | Grades 7 - 8 | 3.96 - 30.67 | Costs:      
Credit risk      
Total   0  
Credit risk | Commitments and contingencies | Stage 1 | Costs:      
Credit risk      
Total 582,359 526,452  
Credit risk | Commitments and contingencies | Stage 1 | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Total 257,831 245,927  
Credit risk | Commitments and contingencies | Stage 1 | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Total 172,993    
Credit risk | Commitments and contingencies | Stage 1 | Grades 5 - 6 | 0.75 - 3.95 | Costs:      
Credit risk      
Total   198,638  
Credit risk | Commitments and contingencies | Stage 1 | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Total 151,535    
Credit risk | Commitments and contingencies | Stage 1 | Grades 7 - 8 | 3.96 - 30.67 | Costs:      
Credit risk      
Total   81,887  
Credit risk | Commitments and contingencies | Stage 2 | Stage 2 | Costs:      
Credit risk      
Total 21,400 38,446  
Credit risk | Commitments and contingencies | Stage 2 | Stage 2 | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Total 0 0  
Credit risk | Commitments and contingencies | Stage 2 | Stage 2 | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Total 21,400    
Credit risk | Commitments and contingencies | Stage 2 | Stage 2 | Grades 5 - 6 | 0.75 - 3.95 | Costs:      
Credit risk      
Total   38,446  
Credit risk | Commitments and contingencies | Stage 2 | Stage 2 | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Total 0    
Credit risk | Commitments and contingencies | Stage 2 | Stage 2 | Grades 7 - 8 | 3.96 - 30.67 | Costs:      
Credit risk      
Total   0  
Credit risk | Customers' liabilities under acceptances | Costs:      
Credit risk      
Total 201,515 74,366  
Credit risk | Customers' liabilities under acceptances | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Total $ 54,185 $ 1,498  
Credit risk | Customers' liabilities under acceptances | Grades 1 - 4 | 0.03 - 0.74 | Costs: | Minimum of the year      
Credit risk      
PD Ranges 0.03% 0.03%  
Credit risk | Customers' liabilities under acceptances | Grades 1 - 4 | 0.03 - 0.74 | Costs: | Maximum of the year      
Credit risk      
PD Ranges 0.74% 0.74%  
Credit risk | Customers' liabilities under acceptances | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Total $ 6,903    
Credit risk | Customers' liabilities under acceptances | Grades 5 - 6 | 0.75 - 3.80 | Costs: | Minimum of the year      
Credit risk      
PD Ranges 0.75%    
Credit risk | Customers' liabilities under acceptances | Grades 5 - 6 | 0.75 - 3.80 | Costs: | Maximum of the year      
Credit risk      
PD Ranges 3.80%    
Credit risk | Customers' liabilities under acceptances | Grades 5 - 6 | 0.75 - 3.95 | Costs:      
Credit risk      
Total   $ 723  
Credit risk | Customers' liabilities under acceptances | Grades 5 - 6 | 0.75 - 3.95 | Costs: | Minimum of the year      
Credit risk      
PD Ranges   0.75%  
Credit risk | Customers' liabilities under acceptances | Grades 5 - 6 | 0.75 - 3.95 | Costs: | Maximum of the year      
Credit risk      
PD Ranges   3.95%  
Credit risk | Customers' liabilities under acceptances | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Total $ 140,427    
Credit risk | Customers' liabilities under acceptances | Grades 7 - 8 | 3.81 - 34.51 | Costs: | Minimum of the year      
Credit risk      
PD Ranges 3.81%    
Credit risk | Customers' liabilities under acceptances | Grades 7 - 8 | 3.81 - 34.51 | Costs: | Maximum of the year      
Credit risk      
PD Ranges 34.51%    
Credit risk | Customers' liabilities under acceptances | Grades 7 - 8 | 3.96 - 30.67 | Costs:      
Credit risk      
Total   $ 72,145  
Credit risk | Customers' liabilities under acceptances | Grades 7 - 8 | 3.96 - 30.67 | Costs: | Minimum of the year      
Credit risk      
PD Ranges   3.96%  
Credit risk | Customers' liabilities under acceptances | Grades 7 - 8 | 3.96 - 30.67 | Costs: | Maximum of the year      
Credit risk      
PD Ranges   30.67%  
Credit risk | Customers' liabilities under acceptances | Stage 3 | Costs:      
Credit risk      
Total $ 0 $ 0  
Credit risk | Customers' liabilities under acceptances | Stage 3 | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Total 0 0  
Credit risk | Customers' liabilities under acceptances | Stage 3 | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Total 0    
Credit risk | Customers' liabilities under acceptances | Stage 3 | Grades 5 - 6 | 0.75 - 3.95 | Costs:      
Credit risk      
Total   0  
Credit risk | Customers' liabilities under acceptances | Stage 3 | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Total 0    
Credit risk | Customers' liabilities under acceptances | Stage 3 | Grades 7 - 8 | 3.96 - 30.67 | Costs:      
Credit risk      
Total   0  
Credit risk | Customers' liabilities under acceptances | Stage 1 | Costs:      
Credit risk      
Total 201,515 74,366  
Credit risk | Customers' liabilities under acceptances | Stage 1 | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Total 54,185 1,498  
Credit risk | Customers' liabilities under acceptances | Stage 1 | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Total 6,903    
Credit risk | Customers' liabilities under acceptances | Stage 1 | Grades 5 - 6 | 0.75 - 3.95 | Costs:      
Credit risk      
Total   723  
Credit risk | Customers' liabilities under acceptances | Stage 1 | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Total 140,427    
Credit risk | Customers' liabilities under acceptances | Stage 1 | Grades 7 - 8 | 3.96 - 30.67 | Costs:      
Credit risk      
Total   72,145  
Credit risk | Customers' liabilities under acceptances | Stage 2 | Stage 2 | Costs:      
Credit risk      
Total 0 0  
Credit risk | Customers' liabilities under acceptances | Stage 2 | Stage 2 | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Total 0 0  
Credit risk | Customers' liabilities under acceptances | Stage 2 | Stage 2 | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Total 0    
Credit risk | Customers' liabilities under acceptances | Stage 2 | Stage 2 | Grades 5 - 6 | 0.75 - 3.95 | Costs:      
Credit risk      
Total   0  
Credit risk | Customers' liabilities under acceptances | Stage 2 | Stage 2 | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Total $ 0    
Credit risk | Customers' liabilities under acceptances | Stage 2 | Stage 2 | Grades 7 - 8 | 3.96 - 30.67 | Costs:      
Credit risk      
Total   $ 0