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DEBT SECURITIES - Schedule of Debt Securities in an Unrealized or Unrecognized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Fair Value    
Less than 12 months $ 182,678 $ 185,148
12 months or more 980,555 1,281,595
Total 1,163,233 1,466,743
Unrealized Losses    
Less than 12 months (2,650) (895)
12 months or more (159,575) (229,430)
Total (162,225) (230,325)
Fair Value    
12 months or more 659,471 675,053
Total 659,471 675,053
Unrecognized Losses    
12 months or more (125,350) (151,577)
Total (125,350) (151,577)
Obligations of U.S. government corporations and agencies    
Fair Value    
Less than 12 months 69,984 0
12 months or more 0 1,328
Total 69,984 1,328
Unrealized Losses    
Less than 12 months (195) 0
12 months or more 0 (8)
Total (195) (8)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 months 99,487 11,234
12 months or more 95,200 119,723
Total 194,687 130,957
Unrealized Losses    
Less than 12 months (2,375) (209)
12 months or more (10,206) (16,527)
Total (12,581) (16,736)
Asset-backed securities    
Fair Value    
Less than 12 months   14,997
12 months or more   0
Total   14,997
Unrealized Losses    
Less than 12 months   (3)
12 months or more   0
Total   (3)
Commercial mortgage-backed securities    
Fair Value    
Less than 12 months 5,813 6,238
12 months or more 72,141 85,936
Total 77,954 92,174
Unrealized Losses    
Less than 12 months (61) (42)
12 months or more (11,682) (15,089)
Total (11,743) (15,131)
Fair Value    
12 months or more 329,632 338,288
Total 329,632 338,288
Unrecognized Losses    
12 months or more (68,743) (77,242)
Total (68,743) (77,242)
Residential mortgage-backed securities    
Fair Value    
Less than 12 months 1,427 152,081
12 months or more 782,258 930,642
Total 783,685 1,082,723
Unrealized Losses    
Less than 12 months (1) (640)
12 months or more (135,785) (191,259)
Total (135,786) (191,899)
Fair Value    
12 months or more 329,839 336,765
Total 329,839 336,765
Unrecognized Losses    
12 months or more (56,607) (74,335)
Total (56,607) (74,335)
Corporate debt securities    
Fair Value    
Less than 12 months 5,967 598
12 months or more 30,956 143,966
Total 36,923 144,564
Unrealized Losses    
Less than 12 months (18) (1)
12 months or more (1,902) (6,547)
Total $ (1,920) $ (6,548)