Investments, Fixed Maturities with Unrealized Losses (Details) $ in Thousands	Jun. 30, 2022 USD ($) Securities	Dec. 31, 2021 USD ($)
Debt Securities, Fair Value and Unrealized Losses by Fixed Maturities [Abstract]
Less than 12 months, fair value	$ 855,750	$ 267,089
Less than 12 months, unrealized losses	78,948	4,049
More than 12 months, fair value	136,777	39,341
More than 12 months, unrealized losses	$ 22,555	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	827
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	$ 90,365	27,691
Less than 12 months, unrealized losses	5,082	412
More than 12 months, fair value	33,226	28,426
More than 12 months, unrealized losses	5,065	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	280,663	56,655
Less than 12 months, unrealized losses	44,718	899
More than 12 months, fair value	28,139	7,091
More than 12 months, unrealized losses	6,716	132
Corporate Securities [Member]
Debt Securities, Fair Value and Unrealized Losses by Fixed Maturities [Abstract]
Less than 12 months, fair value	306,511	92,737
Less than 12 months, unrealized losses	20,417	1,610
More than 12 months, fair value	31,213	1,463
More than 12 months, unrealized losses	4,764	37
Mortgage-Backed Securities [Member]
Debt Securities, Fair Value and Unrealized Losses by Fixed Maturities [Abstract]
Less than 12 months, fair value	178,211	90,006
Less than 12 months, unrealized losses	8,731	1,128
More than 12 months, fair value	44,199	2,361
More than 12 months, unrealized losses	$ 6,010	$ 82