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Allowance for credit losses - Allowance for loan losses - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Modifications [Line Items]
Accumulated loans modified to borrowers under financial difficulties			$ 1,644,647
Outstanding balance of loans modified for borrowers under financial difficulties that were subject to payment default		$ 10,000
Extension of maturity date
Financing Receivable, Modifications [Line Items]
Outstanding balance of loans modified for borrowers under financial difficulties that were subject to payment default		8,000
Combination of reduction of interest rate and extension of maturity
Financing Receivable, Modifications [Line Items]
Outstanding balance of loans modified for borrowers under financial difficulties that were subject to payment default		2,000
Commercial and construction
Financing Receivable, Modifications [Line Items]
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings	$ 21,000	$ 21,000	12,000
Commercial
Financing Receivable, Modifications [Line Items]
Accumulated loans modified to borrowers under financial difficulties			324,425
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings			$ 12,000
PB
Financing Receivable, Modifications [Line Items]
Reduction in ACL	$ (15,000)