Investments, Securities with Continuous Unrealized Loss Position (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) Security	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) Security	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) Security
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months	$ 1,120		$ 1,120		$ 6,878
12 months or longer	172,727		172,727		183,695
Total	173,847		173,847		190,573
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	128		128		53
12 months or longer	17,298		17,298		21,638
Total	$ 17,426		$ 17,426		$ 21,691
Number of securities in unrealized loss position | Security	183		183		222
Allowance for expected credit losses on available-for-sale fixed maturities	$ 0		$ 0		$ 0
Realized investment gains	4	$ 0	17	$ 70
U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member]
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months	250		250		5,194
12 months or longer	34,170		34,170		39,476
Total	34,420		34,420		44,670
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	0		0		37
12 months or longer	3,802		3,802		4,907
Total	3,802		3,802		4,944
Allowance for expected credit losses on available-for-sale fixed maturities	0		0		0
Obligations of States and Political Subdivisions [Member]
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months	0		0		1,145
12 months or longer	6,190		6,190		5,936
Total	6,190		6,190		7,081
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	0		0		3
12 months or longer	1,166		1,166		1,421
Total	1,166		1,166		1,424
Allowance for expected credit losses on available-for-sale fixed maturities	0		0		0
Corporate Securities [Member]
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months	870		870		539
12 months or longer	132,367		132,367		138,283
Total	133,237		133,237		138,822
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	128		128		13
12 months or longer	12,330		12,330		15,310
Total	12,458		12,458		15,323
Allowance for expected credit losses on available-for-sale fixed maturities	$ 0		$ 0		$ 0