Investments, Amortized Cost and Estimated Fair Value of Fixed Maturities by Contractual Maturity (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Held To Maturity [Abstract]
Due in one year or less, amortized cost	$ 45,820,000
Due after one year through five years, amortized cost	84,198,000
Due after five years through ten years, amortized cost	237,451,000
Due after ten years, amortized cost	319,077,000
Mortgage-backed securities, amortized cost	13,789,000
Amortized cost	700,335,137	$ 668,104,568
Available For Sale [Abstract]
Due in one year or less, amortized cost	22,726,000
Due after one year through five years, amortized cost	150,825,000
Due after five years through ten years, amortized cost	107,916,000
Due after ten years, amortized cost	30,880,000
Mortgage-backed securities, amortized cost	227,130,000
Total available for sale, amortized cost	539,477,000	523,293,000
Held To Maturity [Abstract]
Due in one year or less, estimated fair value	46,701,000
Due after one year through five years, estimated fair value	83,346,000
Due after five years through ten years, estimated fair value	217,914,000
Due after ten years, estimated fair value	273,077,000
Mortgage-backed securities, estimated fair value	13,579,000
Total held to maturity, estimated fair value	634,617,000	697,401,000
Available For Sale [Abstract]
Due in one year or less, estimated fair value	22,718,000
Due after one year through five years, estimated fair value	144,006,000
Due after five years through ten years, estimated fair value	100,391,000
Due after ten years, estimated fair value	27,309,000
Mortgage-backed securities, estimated fair value	212,622,000
Total available for sale, estimated fair value	$ 507,046,119	$ 532,629,015