Investment Securities, Amortized Cost, Unrealized Gains and Losses and Estimated Fair Values of Investments in Debt and Other Securities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Investment securities available-for-sale [Abstract]
Amortized cost	$ 683,784	$ 636,092
Unrealized gains	102	4,798
Unrealized losses	(65,794)	(8,677)
Estimated fair value	618,092	632,213
Gross realized gains from sales of available-for-sale securities	0	322
Gross realized losses from sales of available-for-sale securities	152	543
U.S. Treasury Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	119,644	86,534
Unrealized gains	13	388
Unrealized losses	(5,842)	(711)
Estimated fair value	113,815	86,211
Securities of U.S. Government Agencies and Corporations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	128,697	104,106
Unrealized gains	20	330
Unrealized losses	(9,806)	(1,826)
Estimated fair value	118,911	102,610
Obligations of States and Political Subdivisions [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	58,955	44,842
Unrealized gains	13	1,444
Unrealized losses	(5,642)	(301)
Estimated fair value	53,326	45,985
Collateralized Mortgage Obligations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	114,983	137,872
Unrealized gains	0	665
Unrealized losses	(19,633)	(2,885)
Estimated fair value	95,350	135,652
Mortgage-backed Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	261,505	262,738
Unrealized gains	56	1,971
Unrealized losses	(24,871)	(2,954)
Estimated fair value	$ 236,690	$ 261,755

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).

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Amount, before tax, of unrealized loss 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).

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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).

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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).

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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