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	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Investment securities available-for-sale [Abstract]
Amortized cost	$ 665,113		$ 665,113		$ 620,314
Unrealized gains	3,141		3,141		733
Unrealized losses	(35,850)		(35,850)		(48,690)
Estimated fair value	632,404		632,404		572,357
ACL	0		0		0
Proceeds from sales of available-for-sale securities	1,720	$ 0	4,652	$ 16,987
Gross realized gains from sales of available-for-sale securities	0	0	0	96
Gross realized losses from sales of available-for-sale securities	75	$ 0	155	$ 160
U.S. Treasury Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	94,368		94,368		90,063
Unrealized gains	634		634		134
Unrealized losses	(1,319)		(1,319)		(3,015)
Estimated fair value	93,683		93,683		87,182
ACL	0		0		0
Securities of U.S. Government Agencies and Corporations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	113,923		113,923		121,305
Unrealized gains	573		573		105
Unrealized losses	(3,757)		(3,757)		(6,331)
Estimated fair value	110,739		110,739		115,079
ACL	0		0		0
Obligations of States and Political Subdivisions [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	71,656		71,656		55,021
Unrealized gains	555		555		237
Unrealized losses	(3,532)		(3,532)		(3,581)
Estimated fair value	68,679		68,679		51,677
ACL	0		0		0
Collateralized Mortgage Obligations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	109,755		109,755		107,658
Unrealized gains	73		73		15
Unrealized losses	(14,592)		(14,592)		(16,726)
Estimated fair value	95,236		95,236		90,947
ACL	0		0		0
Mortgage-backed Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	275,411		275,411		246,267
Unrealized gains	1,306		1,306		242
Unrealized losses	(12,650)		(12,650)		(19,037)
Estimated fair value	264,067		264,067		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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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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