INVESTMENT SECURITIES, Analysis of Gross Unrealized Losses (Details) $ in Thousands	Sep. 30, 2022 USD ($) Security	Dec. 31, 2021 USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 323,946	$ 389,464
12 months or more, fair value	270,068	41,453
Total fair value	594,014	430,917
Less than 12 months, unrealized losses	(26,606)	(7,514)
12 Months or more, unrealized losses	(46,178)	(1,163)
Total unrealized losses	$ (72,784)	(8,677)
Investment securities in an unrealized loss position less than 12 months | Security	416
Investment securities in an unrealized loss position more than 12 months | Security	146
Asset Pledged as Collateral [Member] | Public Deposits or Other Purposes [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Investment securities	$ 50,540	39,695
U.S. Treasury Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	66,255	63,254
12 months or more, fair value	42,943	2,066
Total fair value	109,198	65,320
Less than 12 months, unrealized losses	(2,844)	(673)
12 Months or more, unrealized losses	(3,541)	(38)
Total unrealized losses	(6,385)	(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	43,768	48,288
12 months or more, fair value	62,099	30,158
Total fair value	105,867	78,446
Less than 12 months, unrealized losses	(1,913)	(942)
12 Months or more, unrealized losses	(8,544)	(884)
Total unrealized losses	(10,457)	(1,826)
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	42,252	11,680
12 months or more, fair value	7,598	934
Total fair value	49,850	12,614
Less than 12 months, unrealized losses	(5,103)	(233)
12 Months or more, unrealized losses	(2,607)	(68)
Total unrealized losses	(7,710)	(301)
Collateralized Mortgage Obligations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	44,515	90,299
12 months or more, fair value	51,469	1,298
Total fair value	95,984	91,597
Less than 12 months, unrealized losses	(5,086)	(2,850)
12 Months or more, unrealized losses	(14,467)	(35)
Total unrealized losses	(19,553)	(2,885)
Mortgage-backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	127,156	175,943
12 months or more, fair value	105,959	6,997
Total fair value	233,115	182,940
Less than 12 months, unrealized losses	(11,660)	(2,816)
12 Months or more, unrealized losses	(17,019)	(138)
Total unrealized losses	$ (28,679)	$ (2,954)