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Financial risk review - Schedule of Reconciliation of Changes in Loss Allowance and Explanation of Changes in Gross Carrying Amount for Financial Instruments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Credit risk      
Net effect of changes in allowance for expected credit losses $ 7,750 $ 17,017 $ 8,906
Financial instruments that have been derecognized during the year (33,967) (22,956) (16,770)
New financial assets originated or purchased 43,516 33,402 27,385
Write-offs   (1,700)  
At amortized cost      
Credit risk      
Credit-impaired loans at beginning of year 999,544    
Net effect of changes in allowance for expected credit losses (393) 1,741 4,897
Financial instruments that have been derecognized during the year (630) (1,292) (420)
New financial assets originated or purchased 371 238 1,684
Credit-impaired loans at end of year 1,090,577 999,544  
Securities at FVOCI      
Credit risk      
Credit-impaired loans at beginning of year 11,824    
Net effect of changes in allowance for expected credit losses 1 0 0
Financial instruments that have been derecognized during the year 0 (11) (16)
New financial assets originated or purchased 21 2 0
Credit-impaired loans at end of year 98,748 11,824  
Principal balance - Loans at amortized cost      
Credit risk      
Credit-impaired loans at beginning of year 7,195,567    
Net effect of changes in allowance for expected credit losses 7,984 15,313 4,208
Financial instruments that have been derecognized during the year (29,530) (18,829) (13,217)
New financial assets originated or purchased 39,159 28,870 22,560
Credit-impaired loans at end of year 8,375,172 7,195,567  
Loans commitments and financial guarantee contracts      
Credit risk      
Credit-impaired loans at beginning of year 1,325,134    
Net effect of changes in allowance for expected credit losses 158 (37) (199)
Financial instruments that have been derecognized during the year (3,807) (2,824) (3,117)
New financial assets originated or purchased 3,965 4,292 3,141
Credit-impaired loans at end of year 1,659,445 1,325,134  
Loss allowance | At amortized cost      
Credit risk      
Credit-impaired loans at beginning of year 1,632 7,951  
Transfer to lifetime expected credit losses 0 0  
Net effect of changes in allowance for expected credit losses (393) 1,741  
Financial instruments that have been derecognized during the year (630) (1,292)  
New financial assets originated or purchased 371 238  
Recoveries 331    
Write-offs   (7,006)  
Credit-impaired loans at end of year 1,311 1,632 7,951
Loss allowance | Securities at FVOCI      
Credit risk      
Credit-impaired loans at beginning of year   10  
Net effect of changes in allowance for expected credit losses 1    
Financial instruments that have been derecognized during the year   (11)  
New financial assets originated or purchased 21 2  
Credit-impaired loans at end of year     10
Loss allowance | Principal balance - Loans at amortized cost      
Credit risk      
Credit-impaired loans at beginning of year 59,410 55,200  
Transfer to lifetime expected credit losses 0 0  
Net effect of changes in allowance for expected credit losses 7,984 15,313  
Financial instruments that have been derecognized during the year (29,530) (18,829)  
New financial assets originated or purchased 39,159 28,870  
Recoveries (1,135)    
Write-offs   (21,144)  
Credit-impaired loans at end of year 78,158 59,410 55,200
Loss allowance | Loans commitments and financial guarantee contracts      
Credit risk      
Credit-impaired loans at beginning of year 5,059 3,628  
Transfer to lifetime expected credit losses 0 0  
Transfer to 12-month expected credit losses   0  
Net effect of changes in allowance for expected credit losses 158 (37)  
Financial instruments that have been derecognized during the year (3,807) (2,824)  
New financial assets originated or purchased 3,965 4,292  
Credit-impaired loans at end of year 5,375 5,059 3,628
Expected credit losses collectively assessed | Loss allowance | At amortized cost      
Credit risk      
Credit-impaired loans at beginning of year 0 4,002  
Transfer to lifetime expected credit losses 0 0  
Net effect of changes in allowance for expected credit losses (331) 1,252  
Financial instruments that have been derecognized during the year 0 0  
New financial assets originated or purchased 0 0  
Recoveries 331    
Write-offs   (5,254)  
Credit-impaired loans at end of year 0 0 4,002
Expected credit losses collectively assessed | Loss allowance | Securities at FVOCI      
Credit risk      
Credit-impaired loans at beginning of year 0 0  
Net effect of changes in allowance for expected credit losses 0    
Financial instruments that have been derecognized during the year   0  
New financial assets originated or purchased 0 0  
Credit-impaired loans at end of year 0 0 0
Expected credit losses collectively assessed | Loss allowance | Principal balance - Loans at amortized cost      
Credit risk      
Credit-impaired loans at beginning of year 6,898 21,561  
Transfer to lifetime expected credit losses 1,472 0  
Net effect of changes in allowance for expected credit losses 2,978 6,481  
Financial instruments that have been derecognized during the year 0 0  
New financial assets originated or purchased 0 0  
Recoveries (1,135)    
Write-offs   (21,144)  
Credit-impaired loans at end of year 12,483 6,898 21,561
Expected credit losses collectively assessed | Loss allowance | Loans commitments and financial guarantee contracts      
Credit risk      
Credit-impaired loans at beginning of year 0 0  
Transfer to lifetime expected credit losses 0 0  
Transfer to 12-month expected credit losses   0  
Net effect of changes in allowance for expected credit losses 0 0  
Financial instruments that have been derecognized during the year 0 0  
New financial assets originated or purchased 0 0  
Credit-impaired loans at end of year 0 0 0
Current | Loss allowance | At amortized cost      
Credit risk      
Credit-impaired loans at beginning of year 1,230 2,170  
Transfer to lifetime expected credit losses (21) (46)  
Net effect of changes in allowance for expected credit losses (55) (58)  
Financial instruments that have been derecognized during the year (392) (1,074)  
New financial assets originated or purchased 371 238  
Recoveries 0    
Write-offs   0  
Credit-impaired loans at end of year 1,133 1,230 2,170
Current | Loss allowance | Securities at FVOCI      
Credit risk      
Credit-impaired loans at beginning of year 1 10  
Net effect of changes in allowance for expected credit losses 1    
Financial instruments that have been derecognized during the year   (11)  
New financial assets originated or purchased 21 2  
Credit-impaired loans at end of year 23 1 10
Current | Loss allowance | Principal balance - Loans at amortized cost      
Credit risk      
Credit-impaired loans at beginning of year 34,778 28,589  
Transfer to lifetime expected credit losses (235) (752)  
Net effect of changes in allowance for expected credit losses (1,007) (2,363)  
Financial instruments that have been derecognized during the year (23,723) (17,950)  
New financial assets originated or purchased 35,822 27,254  
Recoveries 0    
Write-offs   0  
Credit-impaired loans at end of year 45,635 34,778 28,589
Current | Loss allowance | Loans commitments and financial guarantee contracts      
Credit risk      
Credit-impaired loans at beginning of year 3,905 3,605  
Transfer to lifetime expected credit losses (84) (24)  
Transfer to 12-month expected credit losses   22  
Net effect of changes in allowance for expected credit losses (154) (58)  
Financial instruments that have been derecognized during the year (2,671) (2,824)  
New financial assets originated or purchased 3,819 3,184  
Credit-impaired loans at end of year 4,815 3,905 3,605
Total | Expected credit losses individually assessed | Loss allowance | At amortized cost      
Credit risk      
Credit-impaired loans at beginning of year 402 1,779  
Transfer to lifetime expected credit losses 21 46  
Net effect of changes in allowance for expected credit losses (7) 547  
Financial instruments that have been derecognized during the year (238) (218)  
New financial assets originated or purchased 0 0  
Recoveries 0    
Write-offs   (1,752)  
Credit-impaired loans at end of year 178 402 1,779
Total | Expected credit losses individually assessed | Loss allowance | Securities at FVOCI      
Credit risk      
Credit-impaired loans at beginning of year 0 0  
Net effect of changes in allowance for expected credit losses 0    
Financial instruments that have been derecognized during the year   0  
New financial assets originated or purchased 0 0  
Credit-impaired loans at end of year 0 0 0
Total | Expected credit losses individually assessed | Loss allowance | Principal balance - Loans at amortized cost      
Credit risk      
Credit-impaired loans at beginning of year 17,734 5,050  
Transfer to lifetime expected credit losses (1,237) 752  
Net effect of changes in allowance for expected credit losses 6,013 11,195  
Financial instruments that have been derecognized during the year (5,807) (879)  
New financial assets originated or purchased 3,337 1,616  
Recoveries 0    
Write-offs   0  
Credit-impaired loans at end of year 20,040 17,734 5,050
Total | Expected credit losses individually assessed | Loss allowance | Loans commitments and financial guarantee contracts      
Credit risk      
Credit-impaired loans at beginning of year 1,154 23  
Transfer to lifetime expected credit losses 84 24  
Transfer to 12-month expected credit losses   (22)  
Net effect of changes in allowance for expected credit losses 312 21  
Financial instruments that have been derecognized during the year (1,136) 0  
New financial assets originated or purchased 146 1,108  
Credit-impaired loans at end of year $ 560 $ 1,154 $ 23