Investments Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Marketable Securities
Estimated Fair Value, Less than 12 Months	$ 369,954	$ 110,165
Estimated Fair Value, 12 Months or More	13,488	18,080
Estimated Fair Value, Total	383,442	128,245
Unrealized Losses, Less than 12 Months	6,983	1,950
Unrealized Losses, 12 Months or More	591	901
Unrealized Losses, Total	7,574	2,851
Subtotal, fixed maturity securities
Fixed Maturity Securities
Estimated Fair Value, Less than 12 Months	350,497	99,457
Estimated Fair Value, 12 Months or More	12,459	15,787
Estimated Fair Value, Total	362,956	115,244
Unrealized Losses, Less than 12 Months	5,424	964
Unrealized Losses, 12 Months or More	386	176
Unrealized Losses, Total	5,810	1,140
Obligations of states and political subdivisions
Fixed Maturity Securities
Estimated Fair Value, Less than 12 Months	2,985	1,047
Estimated Fair Value, 12 Months or More	1,012
Estimated Fair Value, Total	3,997	1,047
Unrealized Losses, Less than 12 Months	85	3
Unrealized Losses, 12 Months or More	38
Unrealized Losses, Total	123	3
Residential mortgage-backed securities
Fixed Maturity Securities
Estimated Fair Value, Less than 12 Months	97,116	8,569
Estimated Fair Value, 12 Months or More	11	9
Estimated Fair Value, Total	97,127	8,578
Unrealized Losses, Less than 12 Months	1,502	14
Unrealized Losses, 12 Months or More	1
Unrealized Losses, Total	1,503	14
Marketable Securities
Pledged as collateral for a borrowing	40,398	37,467
Commercial mortgage-backed securities
Fixed Maturity Securities
Estimated Fair Value, Less than 12 Months	29,660
Estimated Fair Value, Total	29,660
Unrealized Losses, Less than 12 Months	442
Unrealized Losses, Total	442
Other asset-backed securities
Fixed Maturity Securities
Estimated Fair Value, Less than 12 Months	39,266	26,959
Estimated Fair Value, 12 Months or More		9,004
Estimated Fair Value, Total	39,266	35,963
Unrealized Losses, Less than 12 Months	255	84
Unrealized Losses, 12 Months or More		79
Unrealized Losses, Total	255	163
Corporate and other securities
Fixed Maturity Securities
Estimated Fair Value, Less than 12 Months	181,470	62,882
Estimated Fair Value, 12 Months or More	11,436	6,774
Estimated Fair Value, Total	192,906	69,656
Unrealized Losses, Less than 12 Months	3,140	863
Unrealized Losses, 12 Months or More	347	97
Unrealized Losses, Total	3,487	960
Equity securities
Equity Securities
Estimated Fair Value, Less than 12 Months	19,457	10,708
Estimated Fair Value, 12 Months or More	1,029	2,293
Estimated Fair Value, Total	20,486	13,001
Unrealized Losses, Less than 12 Months	1,559	986
Unrealized Losses, 12 Months or More	205	725
Unrealized Losses, Total	$ 1,764	$ 1,711