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DEBT SECURITIES - Schedule of Debt Securities in an Unrealized or Unrecognized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Fair Value    
Less than 12 months $ 380,017 $ 185,148
12 months or more 1,078,471 1,281,595
Total 1,458,488 1,466,743
Unrealized Losses    
Less than 12 months (6,674) (895)
12 months or more (186,623) (229,430)
Total (193,297) (230,325)
Fair Value    
12 months or more 678,470 675,053
Total 678,470 675,053
Unrecognized Losses    
12 months or more (136,932) (151,577)
Total (136,932) (151,577)
Obligations of U.S. government corporations and agencies    
Fair Value    
Less than 12 months 66 0
12 months or more 151 1,328
Total 217 1,328
Unrealized Losses    
Less than 12 months 0 0
12 months or more (2) (8)
Total (2) (8)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 months 130,434 11,234
12 months or more 96,467 119,723
Total 226,901 130,957
Unrealized Losses    
Less than 12 months (5,962) (209)
12 months or more (12,641) (16,527)
Total (18,603) (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 1,495 6,238
12 months or more 74,450 85,936
Total 75,945 92,174
Unrealized Losses    
Less than 12 months (2) (42)
12 months or more (12,760) (15,089)
Total (12,762) (15,131)
Fair Value    
12 months or more 340,222 338,288
Total 340,222 338,288
Unrecognized Losses    
12 months or more (71,458) (77,242)
Total (71,458) (77,242)
Residential mortgage-backed securities    
Fair Value    
Less than 12 months 247,106 152,081
12 months or more 810,718 930,642
Total 1,057,824 1,082,723
Unrealized Losses    
Less than 12 months (689) (640)
12 months or more (157,937) (191,259)
Total (158,626) (191,899)
Fair Value    
12 months or more 338,248 336,765
Total 338,248 336,765
Unrecognized Losses    
12 months or more (65,474) (74,335)
Total (65,474) (74,335)
Corporate debt securities    
Fair Value    
Less than 12 months 916 598
12 months or more 96,685 143,966
Total 97,601 144,564
Unrealized Losses    
Less than 12 months (21) (1)
12 months or more (3,283) (6,547)
Total $ (3,304) $ (6,548)