Fair Value Measurements (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	$ 600,761,425	$ 589,348,243
Equity securities, at fair value	28,883,318	25,902,956
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	87,055,000	85,419,000
Obligations of States and Political Subdivisions [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	37,739,000	38,116,000
Mortgage-Backed Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	280,797,000	269,020,000
Recurring Basis [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Equity securities, at fair value	28,883,000	25,903,000
Investments in the fair value hierarchy	629,644,000	615,251,000
Recurring Basis [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	87,055,000	85,419,000
Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	37,739,000	38,116,000
Recurring Basis [Member] | Corporate Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	195,170,000	196,793,000
Recurring Basis [Member] | Mortgage-Backed Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	280,797,000	269,020,000
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Equity securities, at fair value	26,891,000	23,911,000
Investments in the fair value hierarchy	26,891,000	23,911,000
Recurring Basis [Member] | 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 Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	0	0
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	0	0
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	0	0
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage-Backed Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	0	0
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Equity securities, at fair value	1,992,000	1,992,000
Investments in the fair value hierarchy	602,753,000	591,340,000
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	87,055,000	85,419,000
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	37,739,000	38,116,000
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	195,170,000	196,793,000
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage-Backed Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	280,797,000	269,020,000
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Equity securities, at fair value	0	0
Investments in the fair value hierarchy	0	0
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	0	0
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	0	0
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	0	0
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage-Backed Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	$ 0	$ 0