Schedule I - Summary of Investments - Other than Investments in Related Parties (Details) $ in Thousands	Dec. 31, 2025 USD ($)
Summary of investments - other than investments in related parties
Cost or Amortized Cost	$ 1,689,846
Estimated Fair Value	1,687,521
Amount at which shown in the Balance Sheet	1,687,521
Total fixed maturities
Summary of investments - other than investments in related parties
Cost or Amortized Cost	1,337,235
Estimated Fair Value	1,315,548
Amount at which shown in the Balance Sheet	1,315,548
U.S. government and government agencies and authorities
Summary of investments - other than investments in related parties
Cost or Amortized Cost	380,565
Estimated Fair Value	370,252
Amount at which shown in the Balance Sheet	370,252
Obligations of states and political subdivisions
Summary of investments - other than investments in related parties
Cost or Amortized Cost	38,837
Estimated Fair Value	37,718
Amount at which shown in the Balance Sheet	37,718
Corporate and other securities
Summary of investments - other than investments in related parties
Cost or Amortized Cost	917,833
Estimated Fair Value	907,578
Amount at which shown in the Balance Sheet	907,578
Total equity securities
Summary of investments - other than investments in related parties
Cost or Amortized Cost	201,591
Estimated Fair Value	220,953
Amount at which shown in the Balance Sheet	220,953
Industrial, miscellaneous and all other
Summary of investments - other than investments in related parties
Cost or Amortized Cost	201,591
Estimated Fair Value	220,953
Amount at which shown in the Balance Sheet	220,953
Other invested assets
Summary of investments - other than investments in related parties
Cost or Amortized Cost	151,020
Estimated Fair Value	151,020
Amount at which shown in the Balance Sheet	$ 151,020