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Investments - Summary of Amortized Cost and Estimated Fair Values of Fixed Maturities (Detail) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Equity Method Investments [Line Items] |  |
Total held to maturity, Amortized Cost | $ 476,093,782 | $ 402,798,518
Held to Maturity, Gross Unrealized Gains | 24,926,519 | 8,872,223
Held to Maturity, Gross Unrealized Losses | 705,957 | 6,632,445
Total held to maturity, Estimated Fair Value | 500,314,344 | 405,038,296
Available for Sale, Amortized Cost | 556,839,278 | 535,112,451
Available for Sale, Gross Unrealized Gains | 9,056,799 | 2,139,728
Available for Sale, Gross Unrealized Losses | 944,274 | 10,693,875
Available for Sale, Estimated Fair Value | 564,951,803 | 526,558,304
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total held to maturity, Amortized Cost | 82,916,052 | 76,222,306
Held to Maturity, Gross Unrealized Gains | 1,803,230 | 174,904
Held to Maturity, Gross Unrealized Losses | 68,560 | 1,086,613
Total held to maturity, Estimated Fair Value | 84,650,722 | 75,310,597
Available for Sale, Amortized Cost | 19,302,056 | 45,188,053
Available for Sale, Gross Unrealized Gains | 81,773 | 25,241
Available for Sale, Gross Unrealized Losses | 19,370 | 1,003,365
Available for Sale, Estimated Fair Value | 19,364,459 | 44,209,929
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total held to maturity, Amortized Cost | 204,634,486 | 159,292,158
Held to Maturity, Gross Unrealized Gains | 14,236,736 | 8,236,804
Held to Maturity, Gross Unrealized Losses | 288,174 | 704,104
Total held to maturity, Estimated Fair Value | 218,583,048 | 166,824,858
Available for Sale, Amortized Cost | 55,162,046 | 73,760,836
Available for Sale, Gross Unrealized Gains | 1,641,171 | 1,762,127
Available for Sale, Gross Unrealized Losses | 6,929 | 306,994
Available for Sale, Estimated Fair Value | 56,796,288 | 75,215,969
Corporate Securities [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total held to maturity, Amortized Cost | 156,398,001 | 127,010,071
Held to Maturity, Gross Unrealized Gains | 8,274,912 | 396,197
Held to Maturity, Gross Unrealized Losses | 333,166 | 4,391,451
Total held to maturity, Estimated Fair Value | 164,339,747 | 123,014,817
Available for Sale, Amortized Cost | 154,946,586 | 140,688,937
Available for Sale, Gross Unrealized Gains | 4,477,035 | 203,393
Available for Sale, Gross Unrealized Losses | 180,312 | 3,059,185
Available for Sale, Estimated Fair Value | 159,243,309 | 137,833,145
Mortgage-Backed Securities [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total held to maturity, Amortized Cost | 32,145,243 | 40,273,983
Held to Maturity, Gross Unrealized Gains | 611,641 | 64,318
Held to Maturity, Gross Unrealized Losses | 16,057 | 450,277
Total held to maturity, Estimated Fair Value | 32,740,827 | 39,888,024
Available for Sale, Amortized Cost | 327,428,590 | 275,474,625
Available for Sale, Gross Unrealized Gains | 2,856,820 | 148,967
Available for Sale, Gross Unrealized Losses | 737,663 | 6,324,331
Available for Sale, Estimated Fair Value | $ 329,547,747 | $ 269,299,261

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