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SECURITIES - Investments in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Unrealized Loss    
Less than 12 Months $ (631) $ (37,977)
12 Months or More (71,631) (53,061)
Total (72,262) (91,038)
Fair Value    
Less than 12 Months 21,648 531,226
12 Months or More 720,834 299,159
Total 742,482 830,385
Unrealized Loss    
Less than 12 Months   (22,823)
12 Months or More   (40,171)
Total   (62,994)
Fair Value    
Less than 12 Months   220,934
12 Months or More   239,252
Total   460,186
Unrealized Loss    
Less than 12 Months   (60,800)
12 Months or More   (93,232)
Total   (154,032)
Fair Value    
Less than 12 Months   752,160
12 Months or More   538,411
Total   1,290,571
U.S. Treasury    
Unrealized Loss    
Less than 12 Months 0 (8,401)
12 Months or More (11,093) (6,944)
Total (11,093) (15,345)
Fair Value    
Less than 12 Months 0 92,445
12 Months or More 148,622 62,070
Total 148,622 154,515
U.S. government agency    
Unrealized Loss    
Less than 12 Months (2) (2,980)
12 Months or More (3,260) (1,154)
Total (3,262) (4,134)
Fair Value    
Less than 12 Months 168 47,370
12 Months or More 51,910 7,787
Total 52,078 55,157
Unrealized Loss    
Less than 12 Months   (1,754)
12 Months or More   (7,974)
Total   (9,728)
Fair Value    
Less than 12 Months   15,751
12 Months or More   62,945
Total   78,696
Municipal    
Unrealized Loss    
Less than 12 Months (26) (10,906)
12 Months or More (23,473) (21,283)
Total (23,499) (32,189)
Fair Value    
Less than 12 Months 4,749 149,261
12 Months or More 194,287 87,794
Total 199,036 237,055
Unrealized Loss    
Less than 12 Months   (314)
12 Months or More   0
Total   (314)
Fair Value    
Less than 12 Months   23,433
12 Months or More   0
Total   23,433
Agency residential    
Unrealized Loss    
Less than 12 Months (163) (8,332)
12 Months or More (14,555) (9,908)
Total (14,718) (18,240)
Fair Value    
Less than 12 Months 9,354 127,288
12 Months or More 156,785 65,692
Total 166,139 192,980
Unrealized Loss    
Less than 12 Months   (4,039)
12 Months or More   (2,431)
Total   (6,470)
Fair Value    
Less than 12 Months   78,452
12 Months or More   17,806
Total   96,258
Agency commercial    
Unrealized Loss    
Less than 12 Months (26) (4,764)
12 Months or More (14,179) (12,408)
Total (14,205) (17,172)
Fair Value    
Less than 12 Months 3,016 62,672
12 Months or More 123,404 70,216
Total 126,420 132,888
Unrealized Loss    
Less than 12 Months   (16,716)
12 Months or More   (29,766)
Total   (46,482)
Fair Value    
Less than 12 Months   103,298
12 Months or More   158,501
Total   261,799
Corporate    
Unrealized Loss    
Less than 12 Months (414) (2,594)
12 Months or More (5,071) (1,364)
Total (5,485) (3,958)
Fair Value    
Less than 12 Months 4,361 52,190
12 Months or More 45,826 5,600
Total $ 50,187 $ 57,790