INVESTMENT SECURITIES, Analysis of Gross Unrealized Losses (Details) $ in Thousands	Mar. 31, 2024 USD ($) Security	Dec. 31, 2023 USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 51,470	$ 32,025
12 months or more, fair value	459,569	470,459
Total fair value	511,039	502,484
Less than 12 months, unrealized losses	(423)	(188)
12 Months or more, unrealized losses	(49,960)	(48,502)
Total unrealized losses	$ (50,383)	(48,690)
Investment securities in an unrealized loss position less than 12 months | Security	45
Investment securities in an unrealized loss position more than 12 months | Security	460
Investment securities - available-for-sale, at estimated fair value, net of allowance for credit losses	$ 0	0
Asset Pledged as Collateral [Member] | Public Deposits or Other Purposes [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Investment securities	42,153	43,884
U.S. Treasury Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	2,401	0
12 months or more, fair value	68,912	77,203
Total fair value	71,313	77,203
Less than 12 months, unrealized losses	(15)	0
12 Months or more, unrealized losses	(2,835)	(3,015)
Total unrealized losses	(2,850)	(3,015)
Investment securities - available-for-sale, at estimated fair value, net of allowance for credit losses	0	0
Securities of U.S. Government Agencies and Corporations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	9,804	3,424
12 months or more, fair value	92,229	97,057
Total fair value	102,033	100,481
Less than 12 months, unrealized losses	(43)	(7)
12 Months or more, unrealized losses	(6,134)	(6,324)
Total unrealized losses	(6,177)	(6,331)
Investment securities - available-for-sale, at estimated fair value, net of allowance for credit losses	0	0
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	11,059	4,981
12 months or more, fair value	31,341	32,578
Total fair value	42,400	37,559
Less than 12 months, unrealized losses	(100)	(31)
12 Months or more, unrealized losses	(3,760)	(3,550)
Total unrealized losses	(3,860)	(3,581)
Investment securities - available-for-sale, at estimated fair value, net of allowance for credit losses	0	0
Collateralized Mortgage Obligations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	3,651	6,597
12 months or more, fair value	82,409	80,995
Total fair value	86,060	87,592
Less than 12 months, unrealized losses	(21)	(26)
12 Months or more, unrealized losses	(17,660)	(16,700)
Total unrealized losses	(17,681)	(16,726)
Investment securities - available-for-sale, at estimated fair value, net of allowance for credit losses	0	0
Mortgage-backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	24,555	17,023
12 months or more, fair value	184,678	182,626
Total fair value	209,233	199,649
Less than 12 months, unrealized losses	(244)	(124)
12 Months or more, unrealized losses	(19,571)	(18,913)
Total unrealized losses	(19,815)	(19,037)
Investment securities - available-for-sale, at estimated fair value, net of allowance for credit losses	$ 0	$ 0