Fair Value Measurements (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	$ 566,539,622	$ 523,791,931
Equity securities, at fair value	35,463,958	35,104,840
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	82,151,000	63,522,000
Obligations of States and Political Subdivisions [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	35,546,000	40,156,000
Mortgage-Backed Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	255,820,000	217,276,000
Recurring Basis [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Equity securities, at fair value	35,464,000	35,105,000
Investments in the fair value hierarchy	602,004,000	558,897,000
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	82,151,000	63,522,000
Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	35,546,000	40,156,000
Recurring Basis [Member] | Corporate Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	193,023,000	202,838,000
Recurring Basis [Member] | Mortgage-Backed Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available for sale, at fair value	255,820,000	217,276,000
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	33,472,000	32,821,000
Investments in the fair value hierarchy	33,472,000	32,821,000
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	2,284,000
Investments in the fair value hierarchy	568,532,000	526,076,000
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	82,151,000	63,522,000
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	35,546,000	40,156,000
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	193,023,000	202,838,000
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	255,820,000	217,276,000
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