INVESTMENT SECURITIES, Amortized Cost, Unrealized Gains and Losses and Estimated Fair Values of Investments in Debt and Other Securities (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Investment securities available-for-sale [Abstract]
Amortized cost	$ 680,953		$ 683,784
Unrealized gains	301		102
Unrealized losses	(57,459)		(65,794)
Estimated fair value	623,795		618,092
Allowance for credit losses on available-for-sale securities	0
Accrued interest receivable	$ 2,119		$ 2,151
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Interest receivable and other assets		Interest receivable and other assets
Proceeds from sales of available-for-sale securities	$ 7,201	$ 0
Gross realized gains from sales of available-for-sale securities	58	0
Gross realized losses from sales of available-for-sale securities	56	$ 0
U.S. Treasury Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	116,448		$ 119,644
Unrealized gains	31		13
Unrealized losses	(4,599)		(5,842)
Estimated fair value	111,880		113,815
Securities of U.S. Government Agencies and Corporations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	121,863		128,697
Unrealized gains	16		20
Unrealized losses	(8,380)		(9,806)
Estimated fair value	113,499		118,911
Obligations of States and Political Subdivisions [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	58,858		58,955
Unrealized gains	184		13
Unrealized losses	(4,419)		(5,642)
Estimated fair value	54,623		53,326
Collateralized Mortgage Obligations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	118,431		114,983
Unrealized gains	3		0
Unrealized losses	(17,691)		(19,633)
Estimated fair value	100,743		95,350
Mortgage-backed Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	265,353		261,505
Unrealized gains	67		56
Unrealized losses	(22,370)		(24,871)
Estimated fair value	$ 243,050		$ 236,690

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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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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