INVESTMENT SECURITIES, Analysis of Gross Unrealized Losses (Details) $ in Thousands	Jun. 30, 2023 USD ($) Security	Dec. 31, 2022 USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 91,776	$ 275,604
12 months or more, fair value	489,786	327,817
Total fair value	581,562	603,421
Less than 12 months, unrealized losses	(1,816)	(14,760)
12 Months or more, unrealized losses	(60,598)	(51,034)
Total unrealized losses	$ (62,414)	(65,794)
Investment securities in an unrealized loss position less than 12 months | Security	90
Investment securities in an unrealized loss position more than 12 months | Security	473
Allowance for credit losses on available-for-sale securities	$ 0	0
Asset Pledged as Collateral [Member] | Public Deposits or Other Purposes [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Investment securities	43,449	44,319
U.S. Treasury Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	20,249	54,574
12 months or more, fair value	88,156	56,872
Total fair value	108,405	111,446
Less than 12 months, unrealized losses	(203)	(1,680)
12 Months or more, unrealized losses	(4,847)	(4,162)
Total unrealized losses	(5,050)	(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	15,013	45,261
12 months or more, fair value	96,943	69,635
Total fair value	111,956	114,896
Less than 12 months, unrealized losses	(183)	(1,341)
12 Months or more, unrealized losses	(8,696)	(8,465)
Total unrealized losses	(8,879)	(9,806)
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	12,066	40,479
12 months or more, fair value	31,174	10,049
Total fair value	43,240	50,528
Less than 12 months, unrealized losses	(222)	(3,022)
12 Months or more, unrealized losses	(4,714)	(2,620)
Total unrealized losses	(4,936)	(5,642)
Collateralized Mortgage Obligations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	11,172	36,040
12 months or more, fair value	82,794	59,310
Total fair value	93,966	95,350
Less than 12 months, unrealized losses	(233)	(2,586)
12 Months or more, unrealized losses	(19,164)	(17,047)
Total unrealized losses	(19,397)	(19,633)
Mortgage-backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	33,276	99,250
12 months or more, fair value	190,719	131,951
Total fair value	223,995	231,201
Less than 12 months, unrealized losses	(975)	(6,131)
12 Months or more, unrealized losses	(23,177)	(18,740)
Total unrealized losses	$ (24,152)	$ (24,871)