Investments, Fixed Maturities with Unrealized Losses (Details) $ in Thousands	Mar. 31, 2022 USD ($) Securities	Dec. 31, 2021 USD ($)
Debt Securities, Fair Value and Unrealized Losses by Fixed Maturities [Abstract]
Less than 12 months, fair value	$ 664,495	$ 267,089
Less than 12 months, unrealized losses	38,913	4,049
More than 12 months, fair value	99,961	39,341
More than 12 months, unrealized losses	$ 11,439	1,315
Fixed Maturities [Member]
Debt Securities, Fair Value and Unrealized Losses by Fixed Maturities [Abstract]
Number of fixed maturity securities classified as available for sale | Securities	593
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	$ 52,488	27,691
Less than 12 months, unrealized losses	2,816	412
More than 12 months, fair value	31,710	28,426
More than 12 months, unrealized losses	3,581	1,064
Obligations of States and Political Subdivisions [Member]
Debt Securities, Fair Value and Unrealized Losses by Fixed Maturities [Abstract]
Less than 12 months, fair value	231,429	56,655
Less than 12 months, unrealized losses	19,976	899
More than 12 months, fair value	28,289	7,091
More than 12 months, unrealized losses	3,436	132
Corporate Securities [Member]
Debt Securities, Fair Value and Unrealized Losses by Fixed Maturities [Abstract]
Less than 12 months, fair value	188,463	92,737
Less than 12 months, unrealized losses	8,531	1,610
More than 12 months, fair value	25,649	1,463
More than 12 months, unrealized losses	2,797	37
Mortgage-Backed Securities [Member]
Debt Securities, Fair Value and Unrealized Losses by Fixed Maturities [Abstract]
Less than 12 months, fair value	192,115	90,006
Less than 12 months, unrealized losses	7,590	1,128
More than 12 months, fair value	14,313	2,361
More than 12 months, unrealized losses	$ 1,625	$ 82