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Investment securities (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Held-to-maturity, allowance for credit losses | $ 0 | $ 0 |
Allowance for credit loss on available-for-sale debt securities | 0 | 0 |
Allowance for credit loss on held to maturity debt securities | 0 | 0 |
Debt securities, available-for-sale, sold |  |  | $ 0
Available-for-sale, Amortized Cost | 502,298 | 541,707 |
Proceeds from sales of investment securities available for sale | 32,400 |  |
Net gain on securities sold | 510 |  |
Gross realized losses | 0 |  |
Investment securities purchased | 19,687 |  |
Net loss on securities sold | 0 |  |
Equity securities without readily determinable fair values | 4,973 | 4,908 |
Impairment Related to Equity Securities | 0 |  |
U.S. Treasury securities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Available-for-sale, Amortized Cost | 19,136 | 32,125 |
Mortgage-backed Securities, U.S. Government agencies |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Available-for-sale, Amortized Cost | 20,978 | 42,801 |
Federal Home Loan Bank (FHLB) |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Equity securities without readily determinable fair values | 17,900 | 12,400 |
State and municipals, Tax-exempt |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Available-for-sale, Amortized Cost | 149,342 | $ 132,586 |
Residential mortgage-backed securities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Available-for-sale, Amortized Cost | $ 31,900 |  |

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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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