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Investments - Summary of Amortized Cost and Estimated Fair Value of Fixed Maturities by Contractual Maturity (Detail) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Held to maturity |  |
Due in one year or less, Amortized Cost | $ 16,132,891 |
Due after one year through five years, Amortized Cost | 73,727,277 |
Due after five years through ten years, Amortized Cost | 182,428,771 |
Due after ten years, Amortized Cost | 171,659,600 |
Mortgage-backed securities, Amortized Cost | 32,145,243 |
Total held to maturity, Amortized Cost | 476,093,782 | $ 402,798,518
Available for sale |  |
Due in one year or less, Amortized Cost | 12,943,726 |
Due after one year through five years, Amortized Cost | 89,684,400 |
Due after five years through ten years, Amortized Cost | 112,308,452 |
Due after ten years, Amortized Cost | 14,474,110 |
Mortgage-backed securities, Amortized Cost | 327,428,590 |
Total available for sale, Amortized Cost | 556,839,278 | 535,112,451
Held to maturity |  |
Due in one year or less, Estimated Fair Value | 16,205,362 |
Due after one year through five years, Estimated Fair Value | 76,542,800 |
Due after five years through ten years, Estimated Fair Value | 191,642,042 |
Due after ten years, Estimated Fair Value | 183,183,313 |
Mortgage-backed securities, Estimated Fair Value | 32,740,827 |
Total held to maturity, Estimated Fair Value | 500,314,344 | 405,038,296
Available for sale |  |
Due in one year or less, Estimated Fair Value | 13,075,792 |
Due after one year through five years, Estimated Fair Value | 91,992,458 |
Due after five years through ten years, Estimated Fair Value | 115,407,525 |
Due after ten years, Estimated Fair Value | 14,928,281 |
Mortgage-backed securities, Estimated Fair Value | 329,547,747 |
Total available for sale, Estimated Fair Value | $ 564,951,803 | $ 526,558,304

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