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	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Investment securities available-for-sale [Abstract]
Amortized cost	$ 611,056		$ 611,056		$ 620,314
Unrealized gains	232		232		733
Unrealized losses	(50,214)		(50,214)		(48,690)
Estimated fair value	561,074		561,074		572,357
ACL	0		0		0
Proceeds from sales of available-for-sale securities	1,961	$ 9,785	2,932	$ 16,986
Gross realized gains from sales of available-for-sale securities	0	38	0	96
Gross realized losses from sales of available-for-sale securities	38	$ 104	80	$ 160
U.S. Treasury Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	86,949		86,949		90,063
Unrealized gains	34		34		134
Unrealized losses	(2,447)		(2,447)		(3,015)
Estimated fair value	84,536		84,536		87,182
ACL	0		0		0
Securities of U.S. Government Agencies and Corporations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	108,213		108,213		121,305
Unrealized gains	27		27		105
Unrealized losses	(5,703)		(5,703)		(6,331)
Estimated fair value	102,537		102,537		115,079
ACL	0		0		0
Obligations of States and Political Subdivisions [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	60,688		60,688		55,021
Unrealized gains	130		130		237
Unrealized losses	(4,391)		(4,391)		(3,581)
Estimated fair value	56,427		56,427		51,677
ACL	0		0		0
Collateralized Mortgage Obligations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	105,146		105,146		107,658
Unrealized gains	0		0		15
Unrealized losses	(17,617)		(17,617)		(16,726)
Estimated fair value	87,529		87,529		90,947
ACL	0		0		0
Mortgage-backed Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	250,060		250,060		246,267
Unrealized gains	41		41		242
Unrealized losses	(20,056)		(20,056)		(19,037)
Estimated fair value	230,045		230,045		227,472
ACL	$ 0		$ 0		$ 0

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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Amount of allowance for credit loss 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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