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Financial risk - Bank’s interest rate gap position (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets [abstract]        
Securities and other financial assets $ 1,023,632 $ 831,913    
Loans and receivables, gross 6,763,020      
Liabilities [abstract]        
Repurchase agreements and cash collateral on securities lent (300,498) (427,497)    
Borrowings (4,416,511) (3,304,178) $ (1,966,271) $ (3,118,396)
Interest rate and foreign exchange risk        
Assets [abstract]        
Demand Deposits and Time Deposits 1,241,586 1,253,052    
Securities and other financial assets 1,019,943 824,611    
Loans and receivables, gross 6,763,020 5,739,918    
Interest Rate Gap Position on Total Assets 9,024,549 7,817,581    
Liabilities [abstract]        
Balances on Term Deposits And Time Deposits From Customers (3,190,716) (3,036,228)    
Repurchase agreements and cash collateral on securities lent (300,498) (427,497)    
Borrowings (4,416,511) (3,304,178)    
Interest Rate Gap Position on Total Liabilities (7,907,725) (6,767,903)    
Net effect of derivative financial instruments held for interest risk management 12,527 (17,650)    
Total Interest Rate Sensitivity 1,129,351 1,032,028    
Interest rate risk | Not later than three months [member]        
Assets [abstract]        
Demand Deposits and Time Deposits 1,233,700 1,249,545    
Securities and other financial assets 112,736 26,693    
Loans and receivables, gross 2,956,268 2,510,544    
Interest Rate Gap Position on Total Assets 4,302,704 3,786,782    
Liabilities [abstract]        
Balances on Term Deposits And Time Deposits From Customers (2,746,776) (2,634,776)    
Repurchase agreements and cash collateral on securities lent (52,164) (332,417)    
Borrowings (1,354,457) (1,265,779)    
Interest Rate Gap Position on Total Liabilities (4,153,397) (4,232,972)    
Net effect of derivative financial instruments held for interest risk management 476 2,791    
Total Interest Rate Sensitivity 149,783 (443,399)    
Interest rate risk | Later than three months and not later than six months [member]        
Assets [abstract]        
Demand Deposits and Time Deposits 0 0    
Securities and other financial assets 114,815 28,906    
Loans and receivables, gross 2,531,067 1,593,471    
Interest Rate Gap Position on Total Assets 2,645,882 1,622,377    
Liabilities [abstract]        
Balances on Term Deposits And Time Deposits From Customers (250,299) (309,601)    
Repurchase agreements and cash collateral on securities lent (62,968) (60,052)    
Borrowings (953,503) (653,454)    
Interest Rate Gap Position on Total Liabilities (1,266,770) (1,023,107)    
Net effect of derivative financial instruments held for interest risk management 41 (1,230)    
Total Interest Rate Sensitivity 1,379,153 598,040    
Interest rate risk | Later than six months and not later than one year [member]        
Assets [abstract]        
Demand Deposits and Time Deposits 0 0    
Securities and other financial assets 82,666 121,834    
Loans and receivables, gross 1,007,343 1,378,589    
Interest Rate Gap Position on Total Assets 1,090,009 1,500,423    
Liabilities [abstract]        
Balances on Term Deposits And Time Deposits From Customers (153,862) (78,439)    
Repurchase agreements and cash collateral on securities lent (53,740) 0    
Borrowings (1,083,543) (452,621)    
Interest Rate Gap Position on Total Liabilities (1,291,145) (531,060)    
Net effect of derivative financial instruments held for interest risk management 2,145 (7,773)    
Total Interest Rate Sensitivity (198,991) 961,590    
Interest rate risk | Later than one year and not later than five years [member]        
Assets [abstract]        
Demand Deposits and Time Deposits 0 0    
Securities and other financial assets 701,749 647,178    
Loans and receivables, gross 240,949 246,721    
Interest Rate Gap Position on Total Assets 942,698 893,899    
Liabilities [abstract]        
Balances on Term Deposits And Time Deposits From Customers (35,082) (8,000)    
Repurchase agreements and cash collateral on securities lent (131,626) (35,028)    
Borrowings (999,151) (915,938)    
Interest Rate Gap Position on Total Liabilities (1,165,859) (958,966)    
Net effect of derivative financial instruments held for interest risk management 12,215 (10,722)    
Total Interest Rate Sensitivity (210,946) (75,789)    
Interest rate risk | Later than five years [member]        
Assets [abstract]        
Demand Deposits and Time Deposits 0 0    
Securities and other financial assets 7,977 0    
Loans and receivables, gross 27,393 10,593    
Interest Rate Gap Position on Total Assets 35,370 10,593    
Liabilities [abstract]        
Balances on Term Deposits And Time Deposits From Customers 0 0    
Repurchase agreements and cash collateral on securities lent 0 0    
Borrowings (25,857) (16,386)    
Interest Rate Gap Position on Total Liabilities (25,857) (16,386)    
Net effect of derivative financial instruments held for interest risk management (2,350) (716)    
Total Interest Rate Sensitivity 7,163 (6,509)    
Non Interest Rate Risk [Member]        
Assets [abstract]        
Demand Deposits and Time Deposits 7,886 3,507    
Securities and other financial assets 0 0    
Loans and receivables, gross 0 0    
Interest Rate Gap Position on Total Assets 7,886 3,507    
Liabilities [abstract]        
Balances on Term Deposits And Time Deposits From Customers (4,697) (5,412)    
Repurchase agreements and cash collateral on securities lent 0 0    
Borrowings 0 0    
Interest Rate Gap Position on Total Liabilities (4,697) (5,412)    
Net effect of derivative financial instruments held for interest risk management 0 0    
Total Interest Rate Sensitivity $ 3,189 $ (1,905)