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Loans, net and allowance for credit losses - Net Deferred Loan Costs (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Net deferred loan costs | $ 2,100 | $ 1,700
Unearned income | 1,400 | 1,300
Net loans | 3,976,524 | 3,951,729
Federal Home Loan Bank (FHLB) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits | $ 403,000 | $ 487,800

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