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DEBT SECURITIES - Schedule of Debt Securities in an Unrealized or Unrecognized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair Value    
Less than 12 months $ 4,179 $ 13,033
12 months or more 1,369,246 2,049,784
Total 1,373,425 2,062,817
Unrealized Losses    
Less than 12 months (108) (65)
12 months or more (192,207) (247,180)
Total (192,315) (247,245)
Fair Value    
12 months or more 712,369 730,397
Total 712,369 730,397
Unrecognized Losses    
12 months or more (126,514) (142,231)
Total (126,514) (142,231)
U.S. Treasury securities    
Fair Value    
Less than 12 months 0 0
12 months or more 250 15,946
Total 250 15,946
Unrealized Losses    
Less than 12 months 0 0
12 months or more 0 (85)
Total 0 (85)
Obligations of U.S. government corporations and agencies    
Fair Value    
Less than 12 months 0 0
12 months or more 1,425 5,709
Total 1,425 5,709
Unrealized Losses    
Less than 12 months 0 0
12 months or more (7) (58)
Total (7) (58)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 months 2,518 11,442
12 months or more 134,373 146,797
Total 136,891 158,239
Unrealized Losses    
Less than 12 months (97) (54)
12 months or more (13,047) (17,972)
Total (13,144) (18,026)
Asset-backed securities    
Fair Value    
Less than 12 months   0
12 months or more   468,223
Total   468,223
Unrealized Losses    
Less than 12 months   0
12 months or more   (1,823)
Total   (1,823)
Commercial mortgage-backed securities    
Fair Value    
Less than 12 months 0 0
12 months or more 89,272 103,509
Total 89,272 103,509
Unrealized Losses    
Less than 12 months 0 0
12 months or more (12,492) (15,535)
Total (12,492) (15,535)
Fair Value    
12 months or more 354,905 357,526
Total 354,905 357,526
Unrecognized Losses    
12 months or more (64,780) (71,000)
Total (64,780) (71,000)
Residential mortgage-backed securities    
Fair Value    
Less than 12 months 877 141
12 months or more 993,631 1,110,906
Total 994,508 1,111,047
Unrealized Losses    
Less than 12 months (2) (1)
12 months or more (159,223) (195,546)
Total (159,225) (195,547)
Fair Value    
12 months or more 357,464 372,871
Total 357,464 372,871
Unrecognized Losses    
12 months or more (61,734) (71,231)
Total (61,734) (71,231)
Corporate debt securities    
Fair Value    
Less than 12 months 784 1,450
12 months or more 150,295 198,694
Total 151,079 200,144
Unrealized Losses    
Less than 12 months (9) (10)
12 months or more (7,438) (16,161)
Total $ (7,447) $ (16,171)