Schedule I - Summary of Investments - Other than Investments in Related Parties (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Summary of investments - other than investments in related parties
Cost or Amortized Cost		$ 1,497,073
Estimated Fair Value	$ 1,403,160
Amount at which shown in the Balance Sheet	1,403,160
Total fixed maturities
Summary of investments - other than investments in related parties
Cost or Amortized Cost		1,152,779
Estimated Fair Value	1,050,155
Amount at which shown in the Balance Sheet	1,050,155
U.S. government and government agencies and authorities
Summary of investments - other than investments in related parties
Cost or Amortized Cost		261,703
Estimated Fair Value	236,171
Amount at which shown in the Balance Sheet	236,171
Obligations of states and political subdivisions
Summary of investments - other than investments in related parties
Cost or Amortized Cost		57,319
Estimated Fair Value	54,069
Amount at which shown in the Balance Sheet	54,069
Corporate and other securities.
Summary of investments - other than investments in related parties
Cost or Amortized Cost		833,757
Estimated Fair Value	759,915
Amount at which shown in the Balance Sheet	759,915
Total equity securities
Summary of investments - other than investments in related parties
Cost or Amortized Cost		231,444
Estimated Fair Value	240,155
Amount at which shown in the Balance Sheet	240,155
Industrial, miscellaneous and all other
Summary of investments - other than investments in related parties
Cost or Amortized Cost		231,444
Estimated Fair Value	240,155
Amount at which shown in the Balance Sheet	240,155
Other invested assets
Summary of investments - other than investments in related parties
Cost or Amortized Cost		$ 112,850
Estimated Fair Value	112,850
Amount at which shown in the Balance Sheet	$ 112,850