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Investment securities (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Mar. 31, 2026 | Dec. 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 | 488,750 |  |  | 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 | 22,952 | $ 28,229 |  |
Net loss on securities sold | 0 |  |  |
Equity securities without readily determinable fair values | 5,000 |  |  | 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 | 19,123 |  |  | 32,125
Mortgage-backed Securities, U.S. Government agencies |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Available-for-sale, Amortized Cost | 20,476 |  |  | 42,801
Federal Home Loan Bank (FHLB) |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Equity securities without readily determinable fair values | 14,300 |  |  | 12,400
State and municipals, Tax-exempt |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Available-for-sale, Amortized Cost | 149,271 |  |  | $ 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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