Fair Value - Fair Value Measurements, by Fair Value hierarchy (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Estimated Fair Value	$ 223,954	$ 220,028
Corporate securities
Estimated Fair Value	403	380
Obligations of states and political subdivisions
Estimated Fair Value	223,551	219,648
Quoted Prices In Active Markets for Identical Assets (Level1)
Estimated Fair Value	403	380
Quoted Prices In Active Markets for Identical Assets (Level1) | Corporate securities
Estimated Fair Value	403	380
Quoted Prices In Active Markets for Identical Assets (Level1) | Obligations of states and political subdivisions
Estimated Fair Value	0	0
Significant Other Observable Inputs (Level2)
Estimated Fair Value	223,551	219,648
Significant Other Observable Inputs (Level2) | Corporate securities
Estimated Fair Value	0	0
Significant Other Observable Inputs (Level2) | Obligations of states and political subdivisions
Estimated Fair Value	223,551	219,648
Significant Unobservable Inputs (Level3)
Estimated Fair Value	0	0
Significant Unobservable Inputs (Level3) | Corporate securities
Estimated Fair Value	0	0
Significant Unobservable Inputs (Level3) | Obligations of states and political subdivisions
Estimated Fair Value	$ 0	$ 0