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Investment securities (Notes) | 12 Months Ended
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Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt and Marketable Equity Securities Disclosure [Text Block] | Securities Available for Sale The following tables show the amortized cost, gross unrealized gains and losses and fair value of securities available for sale, by security type as of December 31, 2025 and 2024.
| 2025
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Securities available for sale: |  |  |  |  |  |  |
State and political subdivisions | $ | 198,083 |  |  | $ | 1 |  |  | $ | (34,820) |  |  | $ | 163,264 |
Collateralized mortgage obligations (1) | 234,217 |  |  | — |  |  | (40,534) |  |  | 193,683 |
Mortgage-backed securities (1) | 113,358 |  |  | — |  |  | (17,216) |  |  | 96,142 |
Collateralized loan obligations | 2,307 |  |  | 1 |  |  | (1) |  |  | 2,307 |
Corporate notes | 13,750 |  |  | — |  |  | (699) |  |  | 13,051 |
| $ | 561,715 |  |  | $ | 2 |  |  | $ | (93,270) |  |  | $ | 468,447 |
| 2024
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Securities available for sale: |  |  |  |  |  |  |
State and political subdivisions | $ | 215,942 |  |  | $ | — |  |  | $ | (41,797) |  |  | $ | 174,145 |
Collateralized mortgage obligations (1) | 278,754 |  |  | — |  |  | (59,490) |  |  | 219,264 |
Mortgage-backed securities (1) | 145,992 |  |  | — |  |  | (26,173) |  |  | 119,819 |
Collateralized loan obligations | 18,932 |  |  | 33 |  |  | — |  |  | 18,965 |
Corporate notes | 13,750 |  |  | — |  |  | (1,378) |  |  | 12,372 |
| $ | 673,370 |  |  | $ | 33 |  |  | $ | (128,838) |  |  | $ | 544,565 |
(1)Collateralized mortgage obligations and mortgage-backed securities consist of residential and commercial mortgage pass-through securities and collateralized mortgage obligations guaranteed by FNMA, FHLMC, GNMA and SBA. Securities with a fair value of approximately $418,670 and $455,825 as of December 31, 2025 and 2024, respectively, were pledged as collateral for borrowings and public fund deposits, and for other purposes as required or permitted by law or regulation. The amortized cost and fair value of securities available for sale as of December 31, 2025, by contractual maturity, are shown below. Certain securities have call features that allow the issuer to call the securities prior to maturity. Expected maturities may differ from contractual maturities for collateralized mortgage obligations and mortgage-backed securities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Therefore, collateralized mortgage obligations and mortgage-backed securities are not included in the maturity categories within the following maturity summary.
| 2025
| Amortized Cost |  | Fair Value
Due after five years through ten years | $ | 30,902 |  |  | $ | 28,227 |
Due after ten years | 183,238 |  |  | 150,395 |
| 214,140 |  |  | 178,622 |
Collateralized mortgage obligations and mortgage-backed securities | 347,575 |  |  | 289,825 |
| $ | 561,715 |  |  | $ | 468,447 |
The details of the sales of securities available for sale for the years ended December 31, 2025, 2024 and 2023 are summarized in the following table.
| 2025 |  | 2024 |  | 2023
Proceeds from sales | $ | 63,690 |  |  | $ | 11,841 |  |  | $ | 11,285 |
Gross gains on sales | 3 |  |  | — |  |  | — |
Gross losses on sales | 3,962 |  |  | 1,172 |  |  | 431 |
The following tables show the fair value and gross unrealized losses, aggregated by investment type and length of time that individual securities have been in a continuous loss position, as of December 31, 2025 and 2024.
|  | 2025
|  | Less than 12 months |  | 12 months or longer |  | Total
|  | Fair Value |  | Gross Unrealized Losses |  | No. of Securities |  | Fair Value |  | Gross Unrealized Losses |  | No. of Securities |  | Fair Value |  | Gross Unrealized Losses
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | $ | — |  |  | $ | — |  |  | — |  |  | $ | 163,173 |  |  | $ | (34,820) |  |  | 68 |  |  | $ | 163,173 |  |  | $ | (34,820) |
Collateralized mortgage obligations |  | — |  |  | — |  |  | — |  |  | 193,683 |  |  | (40,534) |  |  | 53 |  |  | 193,683 |  |  | (40,534) |
Mortgage-backed securities |  | — |  |  | — |  |  | — |  |  | 96,142 |  |  | (17,216) |  |  | 22 |  |  | 96,142 |  |  | (17,216) |
Collateralized loan obligations |  | 1,110 |  |  | (1) |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | 1,110 |  |  | (1) |
Corporate notes |  | — |  |  | — |  |  | — |  |  | 13,052 |  |  | (699) |  |  | 8 |  |  | 13,052 |  |  | (699) |
|  | $ | 1,110 |  |  | $ | (1) |  |  | 1 |  | $ | 466,050 |  |  | $ | (93,269) |  |  | 151 |  | $ | 467,160 |  |  | $ | (93,270) |
|  | 2024
|  | Less than 12 months |  | 12 months or longer |  | Total
|  | Fair Value |  | Gross Unrealized Losses |  | No. of Securities |  | Fair Value |  | Gross Unrealized Losses |  | No. of Securities |  | Fair Value |  | Gross Unrealized Losses
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | $ | 4,485 |  |  | $ | (271) |  |  | 7 |  | $ | 169,650 |  |  | $ | (41,526) |  |  | 90 |  | $ | 174,135 |  |  | $ | (41,797) |
Collateralized mortgage obligations |  | — |  |  | — |  |  | — |  |  | 219,264 |  |  | (59,490) |  |  | 69 |  | 219,264 |  |  | (59,490) |
Mortgage-backed securities |  | 610 |  |  | (3) |  |  | 1 |  | 119,209 |  |  | (26,170) |  |  | 25 |  | 119,819 |  |  | (26,173) |
Corporate notes |  | — |  |  | — |  |  | — |  |  | 12,372 |  |  | (1,378) |  |  | 8 |  | 12,372 |  |  | (1,378) |
|  | $ | 5,095 |  |  | $ | (274) |  |  | 8 |  | $ | 520,495 |  |  | $ | (128,564) |  |  | 192 |  | $ | 525,590 |  |  | $ | (128,838) |
If the Company intends to sell, or it is more likely than not that it will be required to sell the security before recovery of its amortized cost basis, then the security is written down to fair value through income. As of December 31, 2025 and December 31, 2024, the Company did not have the intent to sell, nor was it more likely than not that we would be required to sell any of the securities in an unrealized loss position prior to recovery. As of December 31, 2025 and December 31, 2024, the Company also determined that no individual securities in an unrealized loss position represented credit losses that would require an allowance for credit losses. The Company concluded that the unrealized losses were primarily attributable to increases in market interest rates since these securities were purchased and other market conditions. Accrued interest receivable is not included in available-for-sale security balances and is presented in the “Accrued interest receivable” line of the Consolidated Balance Sheets. Interest receivable on securities was $2,354 and $2,842 as of December 31, 2025 and December 31, 2024, respectively, and was excluded from the estimate of credit losses.

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