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INVESTMENTS - Investment Income (Expense) Comprised Primarily of Interest and Dividends (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Investment Income [Line Items]
Total investment income									$ 61,829	$ 50,783	$ 28,424
Less: Investment expenses									(2,681)	(2,334)	(2,639)
Net investment income	$ 15,559	$ 15,406	$ 14,660	$ 13,523	$ 13,714	$ 12,755	$ 11,282	$ 10,698	59,148	48,449	25,785
Available-for-sale debt securities
Net Investment Income [Line Items]
Investment income									35,428	24,793	18,699
Equity securities
Net Investment Income [Line Items]
Investment income									3,647	4,019	3,288
Cash and Cash Equivalents
Net Investment Income [Line Items]
Investment income									22,185	21,448	5,945
Other
Net Investment Income [Line Items]
Investment income									$ 569	$ 523	$ 492