Investments - Gross Realized Gains and Losses (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Debt securities:
Gross realized gains	$ 0	$ 6,000	$ 0	$ 6,000
Gross realized losses	0	(155,000)	0	(155,000)
Total debt securities	0	(149,000)	0	(149,000)
Equity securities:
Gross realized gains	0	356,000	0	375,000
Gross realized losses	0	(1,643,000)	0	(1,731,000)
Total equity securities	0	(1,287,000)	0	(1,356,000)
Total net realized investment gains (losses)	$ 0	$ (1,436,000)	$ 0	$ (1,505,000)