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Investments (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | $ 673,003 | $ 702,937
Unrealized Gains | 855 | 1,793
Unrealized Losses | (80,109) | (78,922)
Fair Value | 593,749 | 625,808
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 5,423 | 6,429
Unrealized Gains | 0 | 1
Unrealized Losses | (134) | (44)
Fair Value | 5,289 | 6,386
MBS issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 493,766 | 525,439
Unrealized Gains | 353 | 630
Unrealized Losses | (69,163) | (65,978)
Fair Value | 424,956 | 460,091
CMO issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 156,131 | 149,387
Unrealized Gains | 502 | 1,161
Unrealized Losses | (9,154) | (9,537)
Fair Value | 147,479 | 141,011
Subordinated corporate bonds |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 17,683 | 21,682
Unrealized Gains |  | 1
Unrealized Losses | (1,658) | (3,363)
Fair Value | $ 16,025 | $ 18,320

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