INVESTMENT SECURITIES, Analysis of Gross Unrealized Losses (Details) $ in Thousands	Jun. 30, 2022 USD ($) Security	Dec. 31, 2021 USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 438,714	$ 389,464
12 months or more, fair value	173,273	41,453
Total fair value	611,987	430,917
Less than 12 months, unrealized losses	(28,634)	(7,514)
12 Months or more, unrealized losses	(18,303)	(1,163)
Total unrealized losses	$ (46,937)	(8,677)
Investment securities in an unrealized loss position less than 12 months | Security	419
Investment securities in an unrealized loss position more than 12 months | Security	87
Asset Pledged as Collateral [Member] | Public Deposits or Other Purposes [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Investment securities	$ 38,866	39,695
U.S. Treasury Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	96,676	63,254
12 months or more, fair value	11,766	2,066
Total fair value	108,442	65,320
Less than 12 months, unrealized losses	(3,562)	(673)
12 Months or more, unrealized losses	(609)	(38)
Total unrealized losses	(4,171)	(711)
Securities of U.S. Government Agencies and Corporations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	56,053	48,288
12 months or more, fair value	49,282	30,158
Total fair value	105,335	78,446
Less than 12 months, unrealized losses	(1,766)	(942)
12 Months or more, unrealized losses	(5,404)	(884)
Total unrealized losses	(7,170)	(1,826)
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	37,968	11,680
12 months or more, fair value	2,687	934
Total fair value	40,655	12,614
Less than 12 months, unrealized losses	(4,188)	(233)
12 Months or more, unrealized losses	(619)	(68)
Total unrealized losses	(4,807)	(301)
Collateralized Mortgage Obligations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	92,906	90,299
12 months or more, fair value	15,085	1,298
Total fair value	107,991	91,597
Less than 12 months, unrealized losses	(11,268)	(2,850)
12 Months or more, unrealized losses	(2,317)	(35)
Total unrealized losses	(13,585)	(2,885)
Mortgage-backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	155,111	175,943
12 months or more, fair value	94,453	6,997
Total fair value	249,564	182,940
Less than 12 months, unrealized losses	(7,850)	(2,816)
12 Months or more, unrealized losses	(9,354)	(138)
Total unrealized losses	$ (17,204)	$ (2,954)