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Financial risk - Loans at amortized cost (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Securities at amortized cost      
Credit risk      
Financial assets $ 941,971 $ 631,123  
Costs: | Securities at amortized cost      
Credit risk      
Financial assets 941,971 631,123  
Loss allowance | Securities at amortized cost      
Credit risk      
Financial assets 7,951 1,790 $ 495
Expected credit losses collectively assessed [member] | Loss allowance | Securities at amortized cost      
Credit risk      
Financial assets 4,002 0 0
Current | Loss allowance | Securities at amortized cost      
Credit risk      
Financial assets 2,170 1,790 462
Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Loss allowance | Securities at amortized cost      
Credit risk      
Financial assets 1,779 0 33
Loans at amortized cost      
Credit risk      
Financial assets 6,763,020 5,734,605  
Loans at amortized cost | Costs:      
Credit risk      
Financial assets 6,763,020 5,734,605  
Loans at amortized cost | Loss allowance      
Credit risk      
Financial assets 55,200 41,476 41,165
Loans at amortized cost | Expected credit losses collectively assessed [member] | Loss allowance      
Credit risk      
Financial assets 21,561 5,186 4,588
Loans at amortized cost | Current | Loss allowance      
Credit risk      
Financial assets 28,589 20,115 16,661
Loans at amortized cost | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Loss allowance      
Credit risk      
Financial assets 5,050 16,175 $ 19,916
Credit risk | Securities at amortized cost      
Credit risk      
Financial assets 934,020 629,333  
Credit risk | Costs: | Securities at amortized cost      
Credit risk      
Financial assets 941,971 631,123  
Credit risk | Loss allowance | Securities at amortized cost      
Credit risk      
Financial assets (7,951) (1,790)  
Credit risk | Grades 1 - 4 | 0.03 - 0.74 | Securities at amortized cost      
Credit risk      
Financial assets $ 736,139 $ 453,627  
Credit risk | Grades 1 - 4 | 0.03 - 0.74 | Minimum of the year | Securities at amortized cost      
Credit risk      
Probability of Default 0.03% 0.03%  
Credit risk | Grades 1 - 4 | 0.03 - 0.74 | Top of range [member] | Securities at amortized cost      
Credit risk      
Probability of Default 0.74% 0.74%  
Credit risk | Grades 5 - 6 | 0.75 - 3.80 | Securities at amortized cost      
Credit risk      
Financial assets $ 200,837 $ 177,496  
Credit risk | Grades 5 - 6 | 0.75 - 3.80 | Minimum of the year | Securities at amortized cost      
Credit risk      
Probability of Default 0.75% 0.75%  
Credit risk | Grades 5 - 6 | 0.75 - 3.80 | Top of range [member] | Securities at amortized cost      
Credit risk      
Probability of Default 3.80% 3.80%  
Credit risk | Grades 7 - 8 | 3.81 - 34.51 | Securities at amortized cost      
Credit risk      
Financial assets $ 4,995    
Credit risk | Grades 7 - 8 | 3.81 - 34.51 | Minimum of the year | Securities at amortized cost      
Credit risk      
Probability of Default 3.81%    
Credit risk | Grades 7 - 8 | 3.81 - 34.51 | Top of range [member] | Securities at amortized cost      
Credit risk      
Probability of Default 34.51%    
Credit risk | Expected credit losses individually assessed [member] | Securities at amortized cost      
Credit risk      
Financial assets $ 993 $ 0  
Credit risk | Expected credit losses individually assessed [member] | Costs: | Securities at amortized cost      
Credit risk      
Financial assets 4,995 0  
Credit risk | Expected credit losses individually assessed [member] | Loss allowance | Securities at amortized cost      
Credit risk      
Financial assets (4,002) 0  
Credit risk | Expected credit losses individually assessed [member] | Grades 1 - 4 | 0.03 - 0.74 | Securities at amortized cost      
Credit risk      
Financial assets 0 0  
Credit risk | Expected credit losses individually assessed [member] | Grades 5 - 6 | 0.75 - 3.80 | Securities at amortized cost      
Credit risk      
Financial assets 0 0  
Credit risk | Expected credit losses individually assessed [member] | Grades 7 - 8 | 3.81 - 34.51 | Securities at amortized cost      
Credit risk      
Financial assets 4,995    
Credit risk | Current | Securities at amortized cost      
Credit risk      
Financial assets 888,217 629,333  
Credit risk | Current | Costs: | Securities at amortized cost      
Credit risk      
Financial assets 890,387 631,123  
Credit risk | Current | Loss allowance | Securities at amortized cost      
Credit risk      
Financial assets (2,170) (1,790)  
Credit risk | Current | Grades 1 - 4 | 0.03 - 0.74 | Securities at amortized cost      
Credit risk      
Financial assets 736,139 453,627  
Credit risk | Current | Grades 5 - 6 | 0.75 - 3.80 | Securities at amortized cost      
Credit risk      
Financial assets 154,248 177,496  
Credit risk | Current | Grades 7 - 8 | 3.81 - 34.51 | Securities at amortized cost      
Credit risk      
Financial assets 0    
Credit risk | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Securities at amortized cost      
Credit risk      
Financial assets 44,810 0  
Credit risk | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Costs: | Securities at amortized cost      
Credit risk      
Financial assets 46,589 0  
Credit risk | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Loss allowance | Securities at amortized cost      
Credit risk      
Financial assets (1,779) 0  
Credit risk | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Grades 1 - 4 | 0.03 - 0.74 | Securities at amortized cost      
Credit risk      
Financial assets 0 0  
Credit risk | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Grades 5 - 6 | 0.75 - 3.80 | Securities at amortized cost      
Credit risk      
Financial assets 46,589 0  
Credit risk | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Grades 7 - 8 | 3.81 - 34.51 | Securities at amortized cost      
Credit risk      
Financial assets 0    
Credit risk | Loans at amortized cost      
Credit risk      
Financial assets 6,707,820 5,693,129  
Credit risk | Loans at amortized cost | Costs:      
Credit risk      
Financial assets 6,763,020 5,734,605  
Credit risk | Loans at amortized cost | Loss allowance      
Credit risk      
Financial assets (55,200) (41,476)  
Credit risk | Loans at amortized cost | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Financial assets $ 2,864,686 $ 3,016,938  
Credit risk | Loans at amortized cost | Grades 1 - 4 | 0.03 - 0.74 | Costs: | Minimum of the year      
Credit risk      
Probability of Default 0.03% 0.03%  
Credit risk | Loans at amortized cost | Grades 1 - 4 | 0.03 - 0.74 | Costs: | Top of range [member]      
Credit risk      
Probability of Default 0.74% 0.74%  
Credit risk | Loans at amortized cost | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Financial assets $ 3,696,526 $ 2,524,147  
Credit risk | Loans at amortized cost | Grades 5 - 6 | 0.75 - 3.80 | Costs: | Minimum of the year      
Credit risk      
Probability of Default 0.75% 0.75%  
Credit risk | Loans at amortized cost | Grades 5 - 6 | 0.75 - 3.80 | Costs: | Top of range [member]      
Credit risk      
Probability of Default 3.80% 3.80%  
Credit risk | Loans at amortized cost | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Financial assets $ 191,701 $ 193,520  
Credit risk | Loans at amortized cost | Grades 7 - 8 | 3.81 - 34.51 | Costs: | Minimum of the year      
Credit risk      
Probability of Default 3.81% 3.81%  
Credit risk | Loans at amortized cost | Grades 7 - 8 | 3.81 - 34.51 | Costs: | Top of range [member]      
Credit risk      
Probability of Default 34.51% 34.51%  
Credit risk | Loans at amortized cost | Grades 9 - 10 | 34.52 - 100 | Costs:      
Credit risk      
Financial assets $ 10,107    
Credit risk | Loans at amortized cost | Grades 9 - 10 | 34.52 - 100 | Costs: | Minimum of the year      
Credit risk      
Probability of Default 34.52%    
Credit risk | Loans at amortized cost | Grades 9 - 10 | 34.52 - 100 | Costs: | Top of range [member]      
Credit risk      
Probability of Default 100.00%    
Credit risk | Loans at amortized cost | Expected credit losses individually assessed [member]      
Credit risk      
Financial assets $ 8,546 $ 5,407  
Credit risk | Loans at amortized cost | Expected credit losses individually assessed [member] | Costs:      
Credit risk      
Financial assets 30,107 10,593  
Credit risk | Loans at amortized cost | Expected credit losses individually assessed [member] | Loss allowance      
Credit risk      
Financial assets (21,561) (5,186)  
Credit risk | Loans at amortized cost | Expected credit losses individually assessed [member] | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Financial assets 0 0  
Credit risk | Loans at amortized cost | Expected credit losses individually assessed [member] | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Financial assets 0 0  
Credit risk | Loans at amortized cost | Expected credit losses individually assessed [member] | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Financial assets 20,000 10,593  
Credit risk | Loans at amortized cost | Expected credit losses individually assessed [member] | Grades 9 - 10 | 34.52 - 100 | Costs:      
Credit risk      
Financial assets 10,107    
Credit risk | Loans at amortized cost | Current      
Credit risk      
Financial assets 6,605,601 5,562,978  
Credit risk | Loans at amortized cost | Current | Costs:      
Credit risk      
Financial assets 6,634,190 5,583,093  
Credit risk | Loans at amortized cost | Current | Loss allowance      
Credit risk      
Financial assets (28,589) (20,115)  
Credit risk | Loans at amortized cost | Current | Grades 1 - 4 | 0.03 - 0.74 | Costs:      
Credit risk      
Financial assets 2,864,686 3,016,938  
Credit risk | Loans at amortized cost | Current | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Financial assets 3,645,901 2,466,348  
Credit risk | Loans at amortized cost | Current | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Financial assets 123,603 99,807  
Credit risk | Loans at amortized cost | Current | Grades 9 - 10 | 34.52 - 100 | Costs:      
Credit risk      
Financial assets 0    
Credit risk | Loans at amortized cost | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member]      
Credit risk      
Financial assets 93,673 124,744  
Credit risk | Loans at amortized cost | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Costs:      
Credit risk      
Financial assets 98,723 140,919  
Credit risk | Loans at amortized cost | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Loss allowance      
Credit risk      
Financial assets (5,050) (16,175)  
Credit risk | Loans at amortized cost | 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 | Loans at amortized cost | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Grades 5 - 6 | 0.75 - 3.80 | Costs:      
Credit risk      
Financial assets 50,625 57,799  
Credit risk | Loans at amortized cost | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Grades 7 - 8 | 3.81 - 34.51 | Costs:      
Credit risk      
Financial assets 48,098 $ 83,120  
Credit risk | Loans at amortized cost | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] | Grades 9 - 10 | 34.52 - 100 | Costs:      
Credit risk      
Financial assets $ 0