Investments, Amortized Cost and Estimated Fair Values of Fixed Maturities (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost and Estimated Fair Values of Fixed Maturities [Abstract]
Held to maturity, carrying value	$ 683,398,852	$ 679,497,038	$ 693,779,000	$ 668,439,000
Held to maturity, allowance for credit loss	1,329,099	1,325,847	$ 1,355,000	$ 0
Held to maturity, amortized cost	684,728,000	680,823,000
Held to maturity, gross unrealized gains	1,312,000	1,656,000
Held to maturity, gross unrealized losses	76,226,000	70,953,000
Held to maturity, estimated fair value	609,814,000	611,526,000
Total available for sale, amortized cost	643,216,000	629,727,000
Available for sale, gross unrealized gains	540,000	905,000
Available for sale, gross unrealized losses	42,995,000	41,284,000
Available for sale, estimated fair value	600,761,425	589,348,243
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Amortized Cost and Estimated Fair Values of Fixed Maturities [Abstract]
Held to maturity, carrying value	91,551,000	91,518,000
Held to maturity, allowance for credit loss	55,000	54,000
Held to maturity, amortized cost	91,606,000	91,572,000
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	9,550,000	8,885,000
Held to maturity, estimated fair value	82,056,000	82,687,000
Total available for sale, amortized cost	91,561,000	89,367,000
Available for sale, gross unrealized gains	79,000	199,000
Available for sale, gross unrealized losses	4,585,000	4,147,000
Available for sale, estimated fair value	87,055,000	85,419,000
Obligations of States and Political Subdivisions [Member]
Amortized Cost and Estimated Fair Values of Fixed Maturities [Abstract]
Held to maturity, carrying value	376,569,000	376,898,000
Held to maturity, allowance for credit loss	266,000	266,000
Held to maturity, amortized cost	376,835,000	377,164,000
Held to maturity, gross unrealized gains	1,057,000	1,449,000
Held to maturity, gross unrealized losses	50,664,000	46,845,000
Held to maturity, estimated fair value	327,228,000	331,768,000
Total available for sale, amortized cost	41,893,000	41,958,000
Available for sale, gross unrealized gains	10,000	12,000
Available for sale, gross unrealized losses	4,164,000	3,854,000
Available for sale, estimated fair value	37,739,000	38,116,000
Corporate Securities [Member]
Amortized Cost and Estimated Fair Values of Fixed Maturities [Abstract]
Held to maturity, carrying value	202,093,000	201,847,000
Held to maturity, allowance for credit loss	1,001,000	1,000,000
Held to maturity, amortized cost	203,094,000	202,847,000
Held to maturity, gross unrealized gains	246,000	207,000
Held to maturity, gross unrealized losses	15,565,000	14,805,000
Held to maturity, estimated fair value	187,775,000	188,249,000
Total available for sale, amortized cost	208,888,000	211,882,000
Available for sale, gross unrealized gains	74,000	100,000
Available for sale, gross unrealized losses	13,792,000	15,189,000
Available for sale, estimated fair value	195,170,000	196,793,000
Mortgage-Backed Securities [Member]
Amortized Cost and Estimated Fair Values of Fixed Maturities [Abstract]
Held to maturity, carrying value	13,186,000	9,234,000
Held to maturity, allowance for credit loss	7,000	6,000
Held to maturity, amortized cost	13,193,000	9,240,000
Held to maturity, gross unrealized gains	9,000	0
Held to maturity, gross unrealized losses	447,000	418,000
Held to maturity, estimated fair value	12,755,000	8,822,000
Total available for sale, amortized cost	300,874,000	286,520,000
Available for sale, gross unrealized gains	377,000	594,000
Available for sale, gross unrealized losses	20,454,000	18,094,000
Available for sale, estimated fair value	$ 280,797,000	$ 269,020,000