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INVESTMENTS - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,353,532	$ 1,162,919
Allowance for Expected Credit Losses	(1,018)	(566)	$ (920)
Gross Unrealized Gains	2,679	2,115
Gross Unrealized Losses	(86,114)	(100,138)
Fair Value	1,269,079	1,064,330
U.S. government obligations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,284	23,886
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	35	49
Gross Unrealized Losses	(572)	(677)
Fair Value	19,747	23,258
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	920,337	779,177
Allowance for Expected Credit Losses	(894)	(469)
Gross Unrealized Gains	1,580	1,097
Gross Unrealized Losses	(52,075)	(64,091)
Fair Value	868,948	715,714
Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	387,538	334,460
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	1,041	969
Gross Unrealized Losses	(31,549)	(32,283)
Fair Value	357,030	303,146
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,893	15,916
Allowance for Expected Credit Losses	(3)	(4)
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,536)	(1,873)
Fair Value	14,354	14,039
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,480	9,480
Allowance for Expected Credit Losses	(121)	(93)	$ (189)
Gross Unrealized Gains	23	0
Gross Unrealized Losses	(382)	(1,214)
Fair Value	$ 9,000	$ 8,173

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