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Financial risk - Loan commitments, financial guarantees issued and customers’ liabilities under acceptances (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Loan commitments and financial guarantee contracts      
Credit risk      
Financial assets $ 942,719 $ 805,274  
Loan commitments and financial guarantee contracts | Costs:      
Credit risk      
Financial assets 163,345 201,515  
Loan commitments and financial guarantee contracts | Loss allowance      
Credit risk      
Financial assets 3,628 3,803 $ 2,904
Loan commitments and financial guarantee contracts | Expected credit losses collectively assessed [member] | Loss allowance      
Credit risk      
Financial assets 0 0 0
Loan commitments and financial guarantee contracts | Current | Loss allowance      
Credit risk      
Financial assets 3,605 3,472 2,426
Loan commitments and financial guarantee contracts | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Loss allowance      
Credit risk      
Financial assets 23 331 $ 478
Credit risk | Loan commitments and financial guarantee contracts      
Credit risk      
Financial assets 939,091 801,471  
Credit risk | Loan commitments and financial guarantee contracts | Costs:      
Credit risk      
Financial assets 942,719 805,274  
Credit risk | Loan commitments and financial guarantee contracts | Loss allowance      
Credit risk      
Financial assets (3,628) (3,803)  
Credit risk | Loan commitments and financial guarantee contracts | Expected credit losses individually assessed [member]      
Credit risk      
Financial assets 0 0  
Credit risk | Loan commitments and financial guarantee contracts | Expected credit losses individually assessed [member] | Costs:      
Credit risk      
Financial assets 0 0  
Credit risk | Loan commitments and financial guarantee contracts | Expected credit losses individually assessed [member] | Loss allowance      
Credit risk      
Financial assets 0 0  
Credit risk | Loan commitments and financial guarantee contracts | Current      
Credit risk      
Financial assets 937,414 780,402  
Credit risk | Loan commitments and financial guarantee contracts | Current | Costs:      
Credit risk      
Financial assets 941,019 783,874  
Credit risk | Loan commitments and financial guarantee contracts | Current | Loss allowance      
Credit risk      
Financial assets (3,605) (3,472)  
Credit risk | Loan commitments and financial guarantee contracts | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member]      
Credit risk      
Financial assets 1,677 21,069  
Credit risk | Loan commitments and financial guarantee contracts | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Costs:      
Credit risk      
Financial assets 1,700 21,400  
Credit risk | Loan commitments and financial guarantee contracts | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Loss allowance      
Credit risk      
Financial assets (23) (331)  
Credit risk | Loan commitments [member] | Costs:      
Credit risk      
Financial assets 779,374 603,759  
Credit risk | Loan commitments [member] | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Financial assets $ 302,260 $ 257,831  
Credit risk | Loan commitments [member] | Grades 1 - 4 | 0.03 - 0.74 | Costs: | Minimum of the year      
Credit risk      
Probability of Default 0.03% 0.03%  
Credit risk | Loan commitments [member] | Grades 1 - 4 | 0.03 - 0.74 | Costs: | Top of range [member]      
Credit risk      
Probability of Default 0.74% 0.74%  
Credit risk | Loan commitments [member] | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Financial assets $ 281,250 $ 194,393  
Credit risk | Loan commitments [member] | Grades 5 - 6 | 0.75 - 3.80 | Costs: | Minimum of the year      
Credit risk      
Probability of Default 0.75% 0.75%  
Credit risk | Loan commitments [member] | Grades 5 - 6 | 0.75 - 3.80 | Costs: | Top of range [member]      
Credit risk      
Probability of Default 3.80% 3.80%  
Credit risk | Loan commitments [member] | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Financial assets $ 195,864 $ 151,535  
Credit risk | Loan commitments [member] | Grades 7 - 8 | 3.81 - 34.51 | Costs: | Minimum of the year      
Credit risk      
Probability of Default 3.81% 3.81%  
Credit risk | Loan commitments [member] | Grades 7 - 8 | 3.81 - 34.51 | Costs: | Top of range [member]      
Credit risk      
Probability of Default 34.51% 34.51%  
Credit risk | Loan commitments [member] | Expected credit losses individually assessed [member] | Costs:      
Credit risk      
Financial assets $ 0 $ 0  
Credit risk | Loan commitments [member] | Expected credit losses individually assessed [member] | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Financial assets 0 0  
Credit risk | Loan commitments [member] | Expected credit losses individually assessed [member] | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Financial assets 0 0  
Credit risk | Loan commitments [member] | Expected credit losses individually assessed [member] | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Financial assets 0 0  
Credit risk | Loan commitments [member] | Current | Costs:      
Credit risk      
Financial assets 777,674 582,359  
Credit risk | Loan commitments [member] | Current | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Financial assets 302,260 257,831  
Credit risk | Loan commitments [member] | Current | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Financial assets 279,550 172,993  
Credit risk | Loan commitments [member] | Current | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Financial assets 195,864 151,535  
Credit risk | Loan commitments [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Costs:      
Credit risk      
Financial assets 1,700 21,400  
Credit risk | Loan commitments [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Financial assets 0 0  
Credit risk | Loan commitments [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Financial assets 1,700 21,400  
Credit risk | Loan commitments [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Financial assets 0 0  
Credit risk | Customers Liabilities Under Acceptances [Member] | Costs:      
Credit risk      
Financial assets 163,345 201,515  
Credit risk | Customers Liabilities Under Acceptances [Member] | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Financial assets $ 34,258 $ 54,185  
Credit risk | Customers Liabilities Under Acceptances [Member] | Grades 1 - 4 | 0.03 - 0.74 | Costs: | Minimum of the year      
Credit risk      
Probability of Default 0.03% 0.03%  
Credit risk | Customers Liabilities Under Acceptances [Member] | Grades 1 - 4 | 0.03 - 0.74 | Costs: | Top of range [member]      
Credit risk      
Probability of Default 0.74% 0.74%  
Credit risk | Customers Liabilities Under Acceptances [Member] | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Financial assets $ 19,782 $ 6,903  
Credit risk | Customers Liabilities Under Acceptances [Member] | Grades 5 - 6 | 0.75 - 3.80 | Costs: | Minimum of the year      
Credit risk      
Probability of Default 0.75% 0.75%  
Credit risk | Customers Liabilities Under Acceptances [Member] | Grades 5 - 6 | 0.75 - 3.80 | Costs: | Top of range [member]      
Credit risk      
Probability of Default 3.80% 3.80%  
Credit risk | Customers Liabilities Under Acceptances [Member] | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Financial assets $ 109,305 $ 140,427  
Credit risk | Customers Liabilities Under Acceptances [Member] | Grades 7 - 8 | 3.81 - 34.51 | Costs: | Minimum of the year      
Credit risk      
Probability of Default 3.81% 3.81%  
Credit risk | Customers Liabilities Under Acceptances [Member] | Grades 7 - 8 | 3.81 - 34.51 | Costs: | Top of range [member]      
Credit risk      
Probability of Default 34.51% 34.51%  
Credit risk | Customers Liabilities Under Acceptances [Member] | Expected credit losses individually assessed [member] | Costs:      
Credit risk      
Financial assets $ 0 $ 0  
Credit risk | Customers Liabilities Under Acceptances [Member] | Expected credit losses individually assessed [member] | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Financial assets 0 0  
Credit risk | Customers Liabilities Under Acceptances [Member] | Expected credit losses individually assessed [member] | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Financial assets 0 0  
Credit risk | Customers Liabilities Under Acceptances [Member] | Expected credit losses individually assessed [member] | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Financial assets 0 0  
Credit risk | Customers Liabilities Under Acceptances [Member] | Current | Costs:      
Credit risk      
Financial assets 163,345 201,515  
Credit risk | Customers Liabilities Under Acceptances [Member] | Current | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Financial assets 34,258 54,185  
Credit risk | Customers Liabilities Under Acceptances [Member] | Current | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Financial assets 19,782 6,903  
Credit risk | Customers Liabilities Under Acceptances [Member] | Current | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Financial assets 109,305 140,427  
Credit risk | Customers Liabilities Under Acceptances [Member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Costs:      
Credit risk      
Financial assets 0 0  
Credit risk | Customers Liabilities Under Acceptances [Member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Financial assets 0 0  
Credit risk | Customers Liabilities Under Acceptances [Member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Financial assets 0 0  
Credit risk | Customers Liabilities Under Acceptances [Member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Financial assets $ 0 $ 0