Investments (Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net Investment Income
Investment fees and expenses	$ (2,285)	$ (1,947)	$ (6,481)	$ (5,677)
Net investment income	37,272	32,754	107,727	94,714
Fixed maturities
Net Investment Income
Interest and dividend income, operating	34,092	28,402	99,150	83,680
Equities
Net Investment Income
Interest and dividend income, operating	1,197	1,158	3,253	3,070
Short-term investments, including Other
Net Investment Income
Interest and dividend income, operating	3,167	4,473	9,718	11,857
BOLI
Net Investment Income
BOLI	$ 1,101	$ 668	$ 2,087	$ 1,784

Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.