DEBT SECURITIES - Schedule of Debt Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value
Less than 12 months	$ 185,148	$ 13,033
12 months or more	1,281,595	2,049,784
Total	1,466,743	2,062,817
Unrealized Losses
Less than 12 months	(895)	(65)
12 months or more	(229,430)	(247,180)
Total	(230,325)	(247,245)
Fair Value
12 months or more	675,053	730,397
Total	675,053	730,397
Unrealized Losses
12 months or more	(151,577)	(142,231)
Total	(151,577)	(142,231)
U.S. Treasury securities
Fair Value
Less than 12 months		0
12 months or more		15,946
Total		15,946
Unrealized Losses
Less than 12 months		0
12 months or more		(85)
Total		(85)
Obligations of U.S. government corporations and agencies
Fair Value
Less than 12 months	0	0
12 months or more	1,328	5,709
Total	1,328	5,709
Unrealized Losses
Less than 12 months	0	0
12 months or more	(8)	(58)
Total	(8)	(58)
Obligations of states and political subdivisions
Fair Value
Less than 12 months	11,234	11,442
12 months or more	119,723	146,797
Total	130,957	158,239
Unrealized Losses
Less than 12 months	(209)	(54)
12 months or more	(16,527)	(17,972)
Total	(16,736)	(18,026)
Asset-backed securities
Fair Value
Less than 12 months	14,997	0
12 months or more	0	468,223
Total	14,997	468,223
Unrealized Losses
Less than 12 months	(3)	0
12 months or more	0	(1,823)
Total	(3)	(1,823)
Commercial mortgage-backed securities
Fair Value
Less than 12 months	6,238	0
12 months or more	85,936	103,509
Total	92,174	103,509
Unrealized Losses
Less than 12 months	(42)	0
12 months or more	(15,089)	(15,535)
Total	(15,131)	(15,535)
Fair Value
12 months or more	338,288	357,526
Total	338,288	357,526
Unrealized Losses
12 months or more	(77,242)	(71,000)
Total	(77,242)	(71,000)
Residential mortgage-backed securities
Fair Value
Less than 12 months	152,081	141
12 months or more	930,642	1,110,906
Total	1,082,723	1,111,047
Unrealized Losses
Less than 12 months	(640)	(1)
12 months or more	(191,259)	(195,546)
Total	(191,899)	(195,547)
Fair Value
12 months or more	336,765	372,871
Total	336,765	372,871
Unrealized Losses
12 months or more	(74,335)	(71,231)
Total	(74,335)	(71,231)
Corporate debt securities
Fair Value
Less than 12 months	598	1,450
12 months or more	143,966	198,694
Total	144,564	200,144
Unrealized Losses
Less than 12 months	(1)	(10)
12 months or more	(6,547)	(16,161)
Total	$ (6,548)	$ (16,171)