Investments, Amortized Cost and Estimated Fair Values of Fixed Maturities (Details) - USD ($)	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost and Estimated Fair Values of Fixed Maturities [Abstract]
Held to maturity, carrying value	$ 690,580,051	$ 683,399,000	$ 679,497,038	$ 685,402,000	$ 693,779,000	$ 688,439,000
Held to maturity, allowance for credit loss	1,353,571	$ 1,329,000	1,325,847	$ 1,324,000	$ 1,355,000	$ 0
Held to maturity, amortized cost	691,934,000		680,823,000
Held to maturity, gross unrealized gains	798,000		1,656,000
Held to maturity, gross unrealized losses	79,486,000		70,953,000
Held to maturity, estimated fair value	613,246,000		611,526,000
Total available for sale, amortized cost	647,149,000		629,727,000
Available for sale, gross unrealized gains	211,000		905,000
Available for sale, gross unrealized losses	43,192,000		41,284,000
Available for sale, estimated fair value	604,168,056		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	93,404,000		91,518,000
Held to maturity, allowance for credit loss	56,000		54,000
Held to maturity, amortized cost	93,460,000		91,572,000
Held to maturity, gross unrealized gains	9,000		0
Held to maturity, gross unrealized losses	9,476,000		8,885,000
Held to maturity, estimated fair value	83,993,000		82,687,000
Total available for sale, amortized cost	94,952,000		89,367,000
Available for sale, gross unrealized gains	42,000		199,000
Available for sale, gross unrealized losses	4,476,000		4,147,000
Available for sale, estimated fair value	90,518,000		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	376,833,000		376,898,000
Held to maturity, allowance for credit loss	269,000		266,000
Held to maturity, amortized cost	377,102,000		377,164,000
Held to maturity, gross unrealized gains	625,000		1,449,000
Held to maturity, gross unrealized losses	53,705,000		46,845,000
Held to maturity, estimated fair value	324,022,000		331,768,000
Total available for sale, amortized cost	41,827,000		41,958,000
Available for sale, gross unrealized gains	9,000		12,000
Available for sale, gross unrealized losses	4,503,000		3,854,000
Available for sale, estimated fair value	37,333,000		38,116,000
Corporate Securities [Member]
Amortized Cost and Estimated Fair Values of Fixed Maturities [Abstract]
Held to maturity, carrying value	207,881,000		201,847,000
Held to maturity, allowance for credit loss	1,021,000		1,000,000
Held to maturity, amortized cost	208,902,000		202,847,000
Held to maturity, gross unrealized gains	164,000		207,000
Held to maturity, gross unrealized losses	15,883,000		14,805,000
Held to maturity, estimated fair value	193,183,000		188,249,000
Total available for sale, amortized cost	207,842,000		211,882,000
Available for sale, gross unrealized gains	54,000		100,000
Available for sale, gross unrealized losses	13,258,000		15,189,000
Available for sale, estimated fair value	194,638,000		196,793,000
Mortgage-Backed Securities [Member]
Amortized Cost and Estimated Fair Values of Fixed Maturities [Abstract]
Held to maturity, carrying value	12,462,000		9,234,000
Held to maturity, allowance for credit loss	8,000		6,000
Held to maturity, amortized cost	12,470,000		9,240,000
Held to maturity, gross unrealized gains	0		0
Held to maturity, gross unrealized losses	422,000		418,000
Held to maturity, estimated fair value	12,048,000		8,822,000
Total available for sale, amortized cost	302,528,000		286,520,000
Available for sale, gross unrealized gains	106,000		594,000
Available for sale, gross unrealized losses	20,955,000		18,094,000
Available for sale, estimated fair value	$ 281,679,000		$ 269,020,000