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Investments - Summary of Amortized Cost and Estimated Fair Value of Fixed Maturities by Contractual Maturity (Detail) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Held to maturity    
Due in one year or less, Amortized Cost $ 38,641,000  
Due after one year through five years, Amortized Cost 83,282,000  
Due after five years through ten years, Amortized Cost 224,135,000  
Due after ten years, Amortized Cost 278,337,000  
Mortgage-backed securities, Amortized Cost 19,453,000  
Total held to maturity, Amortized Cost 643,847,647 $ 586,609,439
Available for sale    
Due in one year or less, Amortized Cost 26,146,000  
Due after one year through five years, Amortized Cost 131,837,000  
Due after five years through ten years, Amortized Cost 96,413,000  
Due after ten years, Amortized Cost 29,124,000  
Mortgage-backed securities, Amortized Cost 222,814,000  
Total available for sale, Amortized Cost 506,334,000  
Held to maturity    
Due in one year or less, Estimated Fair Value 39,762,000  
Due after one year through five years, Estimated Fair Value 88,929,000  
Due after five years through ten years, Estimated Fair Value 237,348,000  
Due after ten years, Estimated Fair Value 294,625,000  
Mortgage-backed securities, Estimated Fair Value 20,458,000  
Total held to maturity, Estimated Fair Value 681,122,000 632,641,000
Available for sale    
Due in one year or less, Estimated Fair Value 26,621,000  
Due after one year through five years, Estimated Fair Value 138,624,000  
Due after five years through ten years, Estimated Fair Value 99,711,000  
Due after ten years, Estimated Fair Value 30,159,000  
Mortgage-backed securities, Estimated Fair Value 227,465,000  
Total available for sale, Estimated Fair Value $ 522,580,264 $ 555,136,017