v3.26.1
Fair Value Measurements - Investments in Available-for-Sale Fixed Maturity and Equity Securities (Details) - Recurring Basis [Member] - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value Measurements [Abstract]    
Equity securities, at fair value $ 48,880 $ 44,370
Investments in the fair value hierarchy 685,400 685,093
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value 20,398 24,329
Obligations of States and Political Subdivisions [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value 50,259 48,551
Corporate Securities [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value 127,994 130,925
Mortgage-Backed Securities [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value 437,869 436,918
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value Measurements [Abstract]    
Equity securities, at fair value 46,644 42,233
Investments in the fair value hierarchy 46,644 42,233
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Obligations of States and Political Subdivisions [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Securities [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage-Backed Securities [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Measurements [Abstract]    
Equity securities, at fair value 2,236 2,137
Investments in the fair value hierarchy 638,756 642,860
Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value 20,398 24,329
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value 50,259 48,551
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value 127,994 130,925
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-Backed Securities [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value 437,869 436,918
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Measurements [Abstract]    
Equity securities, at fair value 0 0
Investments in the fair value hierarchy 0 0
Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value 0 0
Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value 0 0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value 0 0
Significant Unobservable Inputs (Level 3) [Member] | Mortgage-Backed Securities [Member]    
Fair Value Measurements [Abstract]    
Available for sale, at fair value $ 0 $ 0