Investments - Disposition of Fixed Income and Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Summary of the disposition of fixed income and equity securities
Fixed income securities - available-for-sale	$ 11,819	$ 3,064
Fixed income securities - available-for-sale	71,284	190,303
Net Realized Gain (Loss) - Fixed income securities - available-for-sale	0	(2,000)
SALES
Summary of the disposition of fixed income and equity securities
Fixed income securities - available-for-sale	11,819	3,790
Gross Realized Gains - Fixed income securities - available-for-sale	289	35
Gross Realized Losses - Fixed income securities - available-for-sale	(793)	(82)
Net Realized Gain (Loss) - Fixed income securities - available-for-sale	(504)	(47)
Proceeds from Sales - Equity securities	15,910	3,501
Gross Realized Gains - Equity securities	7,234	2,417
Gross Realized Losses - Equity securities	(121)	(101)
Net Realized Gain (Loss) - Equity securities	7,113	2,316
Calls And Maturities Of Marketable Securities
Summary of the disposition of fixed income and equity securities
Fixed income securities - available-for-sale	72,423	190,305
Gross Realized Gains - Fixed income securities - available-for-sale	33	35
Gross Realized Losses - Fixed income securities - available-for-sale	(157)	(40)
Net Realized Gain (Loss) - Fixed income securities - available-for-sale	$ (124)	$ (5)