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Loans, net and allowance for credit losses - Net Deferred Loan Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2026 | Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Net deferred loan costs | $ 2,100 | $ 1,900
Unearned income | 1,500 | 1,500
Net unaccreted discounts | 39,600 | 42,700
Net loans | 4,150,616 | $ 4,027,889
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 | $ 452,300 |

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