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Investments (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | $ 702,937 | $ 796,960
Unrealized Gains | 1,793 | 145
Unrealized Losses | (78,922) | (101,230)
Fair Value | 625,808 | 695,875
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 6,429 | 49,678
Unrealized Gains | 1 | 11
Unrealized Losses | (44) | (463)
Fair Value | 6,386 | 49,226
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 525,439 | 598,845
Unrealized Gains | 630 | 131
Unrealized Losses | (65,978) | (84,957)
Fair Value | 460,091 | 514,019
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 149,387 | 122,760
Unrealized Gains | 1,161 | 0
Unrealized Losses | (9,537) | (13,413)
Fair Value | 141,011 | 109,347
Subordinated corporate bonds |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 21,682 | 25,677
Unrealized Gains | 1 | 3
Unrealized Losses | (3,363) | (2,397)
Fair Value | $ 18,320 | $ 23,283

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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