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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) |  |

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