Investments, Fixed Maturities with Unrealized Losses (Details) $ in Thousands	Mar. 31, 2024 USD ($) Securities	Dec. 31, 2023 USD ($)
Debt Securities, Fair Value and Unrealized Losses by Fixed Maturities [Abstract]
Less than 12 months, fair value	$ 143,860	$ 105,351
Less than 12 months, unrealized losses	1,637	830
More than 12 months, fair value	961,042	955,943
More than 12 months, unrealized losses	$ 117,584	111,407
Number of fixed maturity securities classified as available for sale | Securities	893
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Debt Securities, Fair Value and Unrealized Losses by Fixed Maturities [Abstract]
Less than 12 months, fair value	$ 37,188	32,224
Less than 12 months, unrealized losses	299	217
More than 12 months, fair value	125,533	116,538
More than 12 months, unrealized losses	13,836	12,815
Obligations of States and Political Subdivisions [Member]
Debt Securities, Fair Value and Unrealized Losses by Fixed Maturities [Abstract]
Less than 12 months, fair value	29,747	13,097
Less than 12 months, unrealized losses	251	68
More than 12 months, fair value	304,139	307,429
More than 12 months, unrealized losses	54,577	50,631
Corporate Securities [Member]
Debt Securities, Fair Value and Unrealized Losses by Fixed Maturities [Abstract]
Less than 12 months, fair value	18,034	13,066
Less than 12 months, unrealized losses	431	324
More than 12 months, fair value	343,673	353,863
More than 12 months, unrealized losses	28,926	29,670
Mortgage-Backed Securities [Member]
Debt Securities, Fair Value and Unrealized Losses by Fixed Maturities [Abstract]
Less than 12 months, fair value	58,891	46,964
Less than 12 months, unrealized losses	656	221
More than 12 months, fair value	187,697	178,113
More than 12 months, unrealized losses	$ 20,245	$ 18,291