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AFS Securities (Tables) | 12 Months Ended
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Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract] |
Amortized cost and fair value of available-for-sale securities | The amortized cost and fair value of AFS securities, with gross unrealized gains and losses, are as follows as of December 31:
| 2025
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury | $ | 200,327 |  |  | $ | — |  |  | $ | 2,793 |  |  | $ | 197,534 |
States and political subdivisions | 71,857 |  |  | 45 |  |  | 2,697 |  |  | 69,205 |
Auction rate money market preferred | 3,200 |  |  | — |  |  | 787 |  |  | 2,413 |
Mortgage-backed securities | 23,373 |  |  | — |  |  | 1,121 |  |  | 22,252 |
Collateralized mortgage obligations | 202,482 |  |  | 1,149 |  |  | 3,165 |  |  | 200,466 |
Corporate | 6,450 |  |  | — |  |  | 529 |  |  | 5,921 |
Total | $ | 507,689 |  |  | $ | 1,194 |  |  | $ | 11,092 |  |  | $ | 497,791 |
| 2024
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury | $ | 230,807 |  |  | $ | — |  |  | $ | 10,236 |  |  | $ | 220,571 |
States and political subdivisions | 81,135 |  |  | 9 |  |  | 4,576 |  |  | 76,568 |
Auction rate money market preferred | 3,200 |  |  | — |  |  | 156 |  |  | 3,044 |
Mortgage-backed securities | 29,068 |  |  | — |  |  | 2,182 |  |  | 26,886 |
Collateralized mortgage obligations | 163,156 |  |  | — |  |  | 8,482 |  |  | 154,674 |
Corporate | 8,150 |  |  | — |  |  | 864 |  |  | 7,286 |
Total | $ | 515,516 |  |  | $ | 9 |  |  | $ | 26,496 |  |  | $ | 489,029 |
Amortized cost and fair value of available-for-sale securities by contractual maturity | The amortized cost and fair value of AFS securities by contractual maturity at December 31, 2025 are as follows:
| Maturing |  | Securities with Variable Monthly Payments or Noncontractual Maturities |  |
| Due in One Year or Less |  | After One Year But Within Five Years |  | After Five Years But Within Ten Years |  | After Ten Years |  |  | Total
U.S. Treasury | $ | 190,389 |  |  | $ | 9,938 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 200,327 |
States and political subdivisions | 12,942 |  |  | 17,400 |  |  | 19,997 |  |  | 21,518 |  |  | — |  |  | 71,857 |
Auction rate money market preferred | — |  |  | — |  |  | — |  |  | — |  |  | 3,200 |  |  | 3,200 |
Mortgage-backed securities | — |  |  | — |  |  | — |  |  | — |  |  | 23,373 |  |  | 23,373 |
Collateralized mortgage obligations | — |  |  | — |  |  | — |  |  | — |  |  | 202,482 |  |  | 202,482 |
Corporate | — |  |  | — |  |  | 6,450 |  |  | — |  |  | — |  |  | 6,450 |
Total amortized cost | $ | 203,331 |  |  | $ | 27,338 |  |  | $ | 26,447 |  |  | $ | 21,518 |  |  | $ | 229,055 |  |  | $ | 507,689 |
Fair value | $ | 200,813 |  |  | $ | 26,931 |  |  | $ | 24,735 |  |  | $ | 20,181 |  |  | $ | 225,131 |  |  | $ | 497,791 |
Summary of the activity related to sales of available-for-sale securities | A summary of the sales activity of AFS securities during the years ended December 31 is displayed in the following table.
| 2025 |  | 2024 |  | 2023
Proceeds from sales of AFS securities | $ | — |  |  | $ | — |  |  | $ | 18,089 |
Realized gains (losses) | — |  |  | — |  |  | 67 |
Applicable income tax expense (benefit) | — |  |  | — |  |  | 14 |
Summary of AFS Securities with Gross Unrealized Losses | The information in the following tables pertains to AFS securities with gross unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous loss position at December 31:
| 2025
| Less Than Twelve Months |  | Twelve Months or More |  |
| Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Total Unrealized Losses
U.S. Treasury | $ | — |  |  | $ | — |  |  | $ | 2,793 |  |  | $ | 197,534 |  |  | $ | 2,793 |
States and political subdivisions | 993 |  |  | 13,446 |  |  | 1,704 |  |  | 24,823 |  |  | 2,697 |
Auction rate money market preferred | — |  |  | — |  |  | 787 |  |  | 2,413 |  |  | 787 |
Mortgage-backed securities | — |  |  | — |  |  | 1,121 |  |  | 22,252 |  |  | 1,121 |
Collateralized mortgage obligations | 39 |  |  | 9,042 |  |  | 3,126 |  |  | 120,016 |  |  | 3,165 |
Corporate | — |  |  | — |  |  | 529 |  |  | 5,921 |  |  | 529 |
Total | $ | 1,032 |  |  | $ | 22,488 |  |  | $ | 10,060 |  |  | $ | 372,959 |  |  | $ | 11,092 |
Number of securities in an unrealized loss position: |  |  | 38 |  |  |  |  | 138 |  |  | 176 |
| 2024
| Less Than Twelve Months |  | Twelve Months or More |  |
| Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Total Unrealized Losses
U.S. Treasury | $ | — |  |  | $ | — |  |  | $ | 10,236 |  |  | $ | 220,571 |  |  | $ | 10,236 |
States and political subdivisions | 486 |  |  | 23,553 |  |  | 4,090 |  |  | 36,796 |  |  | 4,576 |
Auction rate money market preferred | — |  |  | — |  |  | 156 |  |  | 3,044 |  |  | 156 |
Mortgage-backed securities | — |  |  | — |  |  | 2,182 |  |  | 26,886 |  |  | 2,182 |
Collateralized mortgage obligations | 185 |  |  | 5,646 |  |  | 8,297 |  |  | 149,028 |  |  | 8,482 |
Corporate | — |  |  | — |  |  | 864 |  |  | 7,286 |  |  | 864 |
Total | $ | 671 |  |  | $ | 29,199 |  |  | $ | 25,825 |  |  | $ | 443,611 |  |  | $ | 26,496 |
Number of securities in an unrealized loss position: |  |  | 175 |  |  |  |  | 178 |  |  | 353 |

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