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DEBT SECURITIES - Debt securities in an unrealized loss position (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value    
Less than 12 months $ 13,002 $ 13,033
12 months or more 1,661,232 2,049,784
Total 1,674,234 2,062,817
Unrealized Losses    
Less than 12 months (171) (65)
Unrealized Losses (248,141) (247,180)
Total (248,312) (247,245)
Fair Value    
12 months or more 713,031 730,397
Total 713,031 730,397
Unrealized Losses    
12 months or more (149,187) (142,231)
Total (149,187) (142,231)
U.S. Treasury securities    
Fair Value    
Less than 12 months 0 0
12 months or more 742 15,946
Total 742 15,946
Unrealized Losses    
Less than 12 months 0 0
Unrealized Losses (7) (85)
Total (7) (85)
Obligations of U.S. government corporations and agencies    
Fair Value    
Less than 12 months 0 0
12 months or more 5,629 5,709
Total 5,629 5,709
Unrealized Losses    
Less than 12 months 0 0
Unrealized Losses (35) (58)
Total (35) (58)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 months 8,524 11,442
12 months or more 134,945 146,797
Total 143,469 158,239
Unrealized Losses    
Less than 12 months (68) (54)
Unrealized Losses (18,023) (17,972)
Total (18,091) (18,026)
Asset-backed securities    
Fair Value    
Less than 12 months 0 0
12 months or more 253,231 468,223
Total 253,231 468,223
Unrealized Losses    
Less than 12 months 0 0
Unrealized Losses (384) (1,823)
Total (384) (1,823)
Commercial mortgage-backed securities    
Fair Value    
Less than 12 months 0 0
12 months or more 92,563 103,509
Total 92,563 103,509
Unrealized Losses    
Less than 12 months 0 0
Unrealized Losses (15,443) (15,535)
Total (15,443) (15,535)
Fair Value    
12 months or more 350,356 357,526
Total 350,356 357,526
Unrealized Losses    
12 months or more (74,590) (71,000)
Total (74,590) (71,000)
Residential mortgage-backed securities    
Fair Value    
Less than 12 months 165 141
12 months or more 1,021,383 1,110,906
Total 1,021,548 1,111,047
Unrealized Losses    
Less than 12 months (1) (1)
Unrealized Losses (201,721) (195,546)
Total (201,722) (195,547)
Fair Value    
12 months or more 362,675 372,871
Total 362,675 372,871
Unrealized Losses    
12 months or more (74,597) (71,231)
Total (74,597) (71,231)
Corporate debt securities    
Fair Value    
Less than 12 months 4,313 1,450
12 months or more 152,739 198,694
Total 157,052 200,144
Unrealized Losses    
Less than 12 months (102) (10)
Unrealized Losses (12,528) (16,161)
Total $ (12,630) $ (16,171)