Investments - Disposition of Fixed Income and Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Summary of the disposition of fixed income and equity securities
Fixed income securities - available-for-sale	$ 10,207	$ 11,819
Fixed income securities - available-for-sale	99,651	71,284
Net Realized Gain (Loss) - Fixed income securities - available-for-sale	0	0
SALES
Summary of the disposition of fixed income and equity securities
Fixed income securities - available-for-sale	10,473	11,819
Gross Realized Gains - Fixed income securities - available-for-sale	62	289
Gross Realized Losses - Fixed income securities - available-for-sale	(205)	(793)
Net Realized Gain (Loss) - Fixed income securities - available-for-sale	(143)	(504)
Proceeds from Sales - Equity securities	26,679	15,910
Gross Realized Gains - Equity securities	15,140	7,234
Gross Realized Losses - Equity securities	(62)	(121)
Net Realized Gain (Loss) - Equity securities	15,078	7,113
Calls And Maturities Of Marketable Securities
Summary of the disposition of fixed income and equity securities
Fixed income securities - available-for-sale	101,454	72,423
Gross Realized Gains - Fixed income securities - available-for-sale	9	33
Gross Realized Losses - Fixed income securities - available-for-sale	(71)	(157)
Net Realized Gain (Loss) - Fixed income securities - available-for-sale	$ (62)	$ (124)