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INVESTMENTS - Schedule of Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,454,822	$ 1,353,532
Allowance for Expected Credit Losses	(722)	(1,018)	$ (566)
Gross Unrealized Gains	11,211	2,679
Gross Unrealized Losses	(51,690)	(86,114)
Fair Value	1,413,621	1,269,079
U.S. government obligations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,552	20,284
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	210	35
Gross Unrealized Losses	(259)	(572)
Fair Value	23,503	19,747
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	979,338	920,337
Allowance for Expected Credit Losses	(653)	(894)
Gross Unrealized Gains	7,657	1,580
Gross Unrealized Losses	(28,498)	(52,075)
Fair Value	957,844	868,948
Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	429,470	387,538
Allowance for Expected Credit Losses	(1)	0
Gross Unrealized Gains	3,291	1,041
Gross Unrealized Losses	(21,761)	(31,549)
Fair Value	410,999	357,030
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,356	15,893
Allowance for Expected Credit Losses	(1)	(3)
Gross Unrealized Gains	11	0
Gross Unrealized Losses	(994)	(1,536)
Fair Value	13,372	14,354
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,106	9,480
Allowance for Expected Credit Losses	(67)	(121)	$ (93)
Gross Unrealized Gains	42	23
Gross Unrealized Losses	(178)	(382)
Fair Value	$ 7,903	$ 9,000

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