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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
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

X

- 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

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Amortized cost of 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 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Topic 942
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-Name Accounting Standards Codification
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