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SECURITIES - Investments in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Unrealized Loss    
Less than 12 Months $ (1,541) $ (37,977)
12 Months or More (100,104) (53,061)
Total (101,645) (91,038)
Fair Value    
Less than 12 Months 35,745 531,226
12 Months or More 713,939 299,159
Total 749,684 830,385
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 (15,357) (6,944)
Total (15,357) (15,345)
Fair Value    
Less than 12 Months 0 92,445
12 Months or More 154,394 62,070
Total 154,394 154,515
U.S. government agency    
Unrealized Loss    
Less than 12 Months (5) (2,980)
12 Months or More (4,763) (1,154)
Total (4,768) (4,134)
Fair Value    
Less than 12 Months 1,380 47,370
12 Months or More 49,298 7,787
Total 50,678 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 (282) (10,906)
12 Months or More (35,962) (21,283)
Total (36,244) (32,189)
Fair Value    
Less than 12 Months 10,479 149,261
12 Months or More 183,720 87,794
Total 194,199 237,055
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 (725) (8,332)
12 Months or More (19,783) (9,908)
Total (20,508) (18,240)
Fair Value    
Less than 12 Months 13,924 127,288
12 Months or More 160,778 65,692
Total 174,702 192,980
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 (86) (4,764)
12 Months or More (18,507) (12,408)
Total (18,593) (17,172)
Fair Value    
Less than 12 Months 3,645 62,672
12 Months or More 120,593 70,216
Total 124,238 132,888
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 (443) (2,594)
12 Months or More (5,732) (1,364)
Total (6,175) (3,958)
Fair Value    
Less than 12 Months 6,317 52,190
12 Months or More 45,156 5,600
Total $ 51,473 $ 57,790