SECURITIES - Investment Securities Available for Sale in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value
Less than 12 months	$ 31,518	$ 137,597
12 months or longer	529,579	468,381
Total	561,097	605,978
Unrealized Losses
Less than 12 months	4,221	9,999
12 months or longer	110,708	86,767
Total	114,929	96,766
U.S. Treasury notes and bonds
Fair Value
Less than 12 months	981	1,011
12 months or longer	54,019	54,563
Total	55,000	55,574
Unrealized Losses
Less than 12 months	14	30
12 months or longer	6,019	6,195
Total	6,033	6,225
Mortgage-backed securities, residential
Fair Value
Less than 12 months	0	79,891
12 months or longer	389,031	355,240
Total	389,031	435,131
Unrealized Losses
Less than 12 months	0	7,621
12 months or longer	97,158	76,086
Total	97,158	83,707
Obligations of states and political subdivisions
Fair Value
Less than 12 months	16,794	37,847
12 months or longer	19,359	0
Total	36,153	37,847
Unrealized Losses
Less than 12 months	1,460	938
12 months or longer	1,922	0
Total	3,382	938
Corporate bonds and notes
Fair Value
Less than 12 months	7,269	4,515
12 months or longer	13,076	7,455
Total	20,345	11,970
Unrealized Losses
Less than 12 months	2,732	485
12 months or longer	2,673	3,295
Total	5,405	3,780
SBA loan pools
Fair Value
Less than 12 months	6,474	14,333
12 months or longer	54,094	51,123
Total	60,568	65,456
Unrealized Losses
Less than 12 months	15	925
12 months or longer	2,936	1,191
Total	$ 2,951	$ 2,116