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Investment in Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investment Securities | The amortized cost, gross unrealized gains, gross unrealized losses and fair value of investment securities are summarized as follows:
| September 30, 2025
(In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
State and political subdivisions | $ | 257,145 |  |  | $ | 1,802 |  |  | $ | (11,838) |  |  | $ | 247,109 |
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 439,159 |  |  | 1,515 |  |  | (27,864) |  |  | 412,810 |
Corporate bonds | 30,960 |  |  | — |  |  | (2,238) |  |  | 28,722 |
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 29,074 |  |  | — |  |  | (346) |  |  | 28,728 |
Total | $ | 756,338 |  |  | $ | 3,317 |  |  | $ | (42,286) |  |  | $ | 717,369 |
| December 31, 2024
(In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
State and political subdivisions | $ | 188,933 |  |  | $ | 4 |  |  | $ | (16,973) |  |  | $ | 171,964 |
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 267,359 |  |  | 11 |  |  | (34,095) |  |  | 233,275 |
Corporate bonds | 95,841 |  |  | 3 |  |  | (8,058) |  |  | 87,786 |
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 35,575 |  |  | — |  |  | (579) |  |  | 34,996 |
Total | $ | 587,708 |  |  | $ | 18 |  |  | $ | (59,705) |  |  | $ | 528,021 |
Schedule of Unrealized Loss on Investments | The fair values of investment securities with unrealized losses are as follows:
| September 30, 2025
| Less than 12 months |  | 12 months or more |  | Total
(In thousands) | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
State and political subdivisions | $ | 2,814 |  |  | $ | 16 |  |  | $ | 148,209 |  |  | $ | 11,822 |  |  | $ | 151,023 |  |  | $ | 11,838 |
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 117,666 |  |  | 1,227 |  |  | 145,446 |  |  | 26,637 |  |  | 263,112 |  |  | 27,864 |
Corporate bonds | — |  |  | — |  |  | 28,723 |  |  | 2,238 |  |  | 28,723 |  |  | 2,238 |
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | — |  |  | — |  |  | 28,728 |  |  | 346 |  |  | 28,728 |  |  | 346 |
Total | $ | 120,480 |  |  | $ | 1,243 |  |  | $ | 351,106 |  |  | $ | 41,043 |  |  | $ | 471,586 |  |  | $ | 42,286 |
| December 31, 2024
| Less than 12 months |  | 12 months or more |  | Total
(In thousands) | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
State and political subdivisions | $ | 4,082 |  |  | $ | 8 |  |  | $ | 163,893 |  |  | $ | 16,964 |  |  | $ | 167,975 |  |  | $ | 16,972 |
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | 85,272 |  |  | 2,086 |  |  | 139,676 |  |  | 32,009 |  |  | 224,948 |  |  | 34,095 |
Corporate bonds | 7,901 |  |  | 99 |  |  | 66,860 |  |  | 7,960 |  |  | 74,761 |  |  | 8,059 |
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises | — |  |  | — |  |  | 30,575 |  |  | 579 |  |  | 30,575 |  |  | 579 |
Total | $ | 97,255 |  |  | $ | 2,193 |  |  | $ | 401,004 |  |  | $ | 57,512 |  |  | $ | 498,259 |  |  | $ | 59,705 |

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