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Allowance for credit losses - Allowance for loan losses - Additional Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable    
Troubled debt restructurings $ 1,693,102 $ 1,656,822
Accruing    
Financing Receivable    
Troubled debt restructurings 1,515,522 1,468,966
Commercial    
Financing Receivable    
Troubled debt restructurings 369,129 326,088
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings 9,000 9,000
Commercial | Accruing    
Financing Receivable    
Troubled debt restructurings $ 302,795 $ 261,344