SECURITIES - Investment Securities Available for Sale in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value
Less than 12 months	$ 2,221	$ 29,297
12 months or longer	556,857	546,649
Total	559,078	575,946
Unrealized Losses
Less than 12 months	26	2,762
12 months or longer	90,650	82,418
Total	90,676	85,180
U.S. Treasury notes and bonds
Fair Value
Less than 12 months	0	0
12 months or longer	55,162	55,332
Total	55,162	55,332
Unrealized Losses
Less than 12 months	0	0
12 months or longer	4,666	4,480
Total	4,666	4,480
Mortgage-backed securities, residential
Fair Value
Less than 12 months	0	0
12 months or longer	388,878	402,986
Total	388,878	402,986
Unrealized Losses
Less than 12 months	0	0
12 months or longer	77,425	72,422
Total	77,425	72,422
Obligations of states and political subdivisions
Fair Value
Less than 12 months	1,154	17,891
12 months or longer	36,991	20,686
Total	38,145	38,577
Unrealized Losses
Less than 12 months	24	241
12 months or longer	1,246	576
Total	1,270	817
Corporate bonds and notes
Fair Value
Less than 12 months	0	7,492
12 months or longer	20,932	13,177
Total	20,932	20,669
Unrealized Losses
Less than 12 months	0	2,508
12 months or longer	4,818	2,573
Total	4,818	5,081
SBA loan pools
Fair Value
Less than 12 months	1,067	3,914
12 months or longer	54,894	54,468
Total	55,961	58,382
Unrealized Losses
Less than 12 months	2	13
12 months or longer	2,495	2,367
Total	$ 2,497	$ 2,380