INVESTMENT SECURITIES, Analysis of Gross Unrealized Losses (Details) $ in Thousands	Mar. 31, 2023 USD ($) Security	Dec. 31, 2022 USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 137,010	$ 275,604
12 months or more, fair value	456,034	327,817
Total fair value	593,044	603,421
Less than 12 months, unrealized losses	(3,292)	(14,760)
12 Months or more, unrealized losses	(54,167)	(51,034)
Total unrealized losses	$ (57,459)	(65,794)
Investment securities in an unrealized loss position less than 12 months | Security	158
Investment securities in an unrealized loss position more than 12 months | Security	399
Allowance for credit losses on available-for-sale securities	$ 0
Asset Pledged as Collateral [Member] | Public Deposits or Other Purposes [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Investment securities	41,552	44,319
U.S. Treasury Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	29,470	54,574
12 months or more, fair value	75,554	56,872
Total fair value	105,024	111,446
Less than 12 months, unrealized losses	(427)	(1,680)
12 Months or more, unrealized losses	(4,172)	(4,162)
Total unrealized losses	(4,599)	(5,842)
Securities of U.S. Government Agencies and Corporations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	24,970	45,261
12 months or more, fair value	85,102	69,635
Total fair value	110,072	114,896
Less than 12 months, unrealized losses	(460)	(1,341)
12 Months or more, unrealized losses	(7,920)	(8,465)
Total unrealized losses	(8,380)	(9,806)
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	10,994	40,479
12 months or more, fair value	29,773	10,049
Total fair value	40,767	50,528
Less than 12 months, unrealized losses	(216)	(3,022)
12 Months or more, unrealized losses	(4,203)	(2,620)
Total unrealized losses	(4,419)	(5,642)
Collateralized Mortgage Obligations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	13,424	36,040
12 months or more, fair value	86,644	59,310
Total fair value	100,068	95,350
Less than 12 months, unrealized losses	(190)	(2,586)
12 Months or more, unrealized losses	(17,501)	(17,047)
Total unrealized losses	(17,691)	(19,633)
Mortgage-backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	58,152	99,250
12 months or more, fair value	178,961	131,951
Total fair value	237,113	231,201
Less than 12 months, unrealized losses	(1,999)	(6,131)
12 Months or more, unrealized losses	(20,371)	(18,740)
Total unrealized losses	$ (22,370)	$ (24,871)