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Investments - Summary of Amortized Cost and Estimated Fair Values of Fixed Maturities (Detail) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
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Schedule of Equity Method Investments [Line Items] |  |
Total held to maturity, Amortized Cost | $ 643,847,647 | $ 586,609,439
Held to Maturity, Gross Unrealized Gains | 38,978,000 | 46,604,000
Held to Maturity, Gross Unrealized Losses | 1,704,000 | 572,000
Total held to maturity, Estimated Fair Value | 681,122,000 | 632,641,000
Available for Sale, Amortized Cost | 506,334,000 | 534,958,000
Available for Sale, Gross Unrealized Gains | 17,335,000 | 20,512,000
Available for Sale, Gross Unrealized Losses | 1,089,000 | 334,000
Available for Sale, Estimated Fair Value | 522,580,000 | 555,136,000
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 | 89,716,000 | 77,435,000
Held to Maturity, Gross Unrealized Gains | 2,839,000 | 3,984,000
Held to Maturity, Gross Unrealized Losses | 649,000 | 223,000
Total held to maturity, Estimated Fair Value | 91,906,000 | 81,196,000
Available for Sale, Amortized Cost | 22,508,000 | 47,512,000
Available for Sale, Gross Unrealized Gains | 257,000 | 424,000
Available for Sale, Gross Unrealized Losses | 439,000 | 121,000
Available for Sale, Estimated Fair Value | 22,326,000 | 47,815,000
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total held to maturity, Amortized Cost | 346,517,000 | 312,319,000
Held to Maturity, Gross Unrealized Gains | 20,073,000 | 23,212,000
Held to Maturity, Gross Unrealized Losses | 788,000 | 143,000
Total held to maturity, Estimated Fair Value | 365,802,000 | 335,388,000
Available for Sale, Amortized Cost | 59,378,000 | 66,287,000
Available for Sale, Gross Unrealized Gains | 2,366,000 | 2,690,000
Available for Sale, Gross Unrealized Losses | 31,000 | 12,000
Available for Sale, Estimated Fair Value | 61,713,000 | 68,965,000
Corporate Securities [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total held to maturity, Amortized Cost | 188,162,000 | 173,270,000
Held to Maturity, Gross Unrealized Gains | 15,061,000 | 18,172,000
Held to Maturity, Gross Unrealized Losses | 267,000 | 206,000
Total held to maturity, Estimated Fair Value | 202,956,000 | 191,236,000
Available for Sale, Amortized Cost | 201,634,000 | 202,396,000
Available for Sale, Gross Unrealized Gains | 9,644,000 | 10,496,000
Available for Sale, Gross Unrealized Losses | 202,000 | 184,000
Available for Sale, Estimated Fair Value | 211,076,000 | 212,708,000
Mortgage-Backed Securities [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total held to maturity, Amortized Cost | 19,453,000 | 23,585,000
Held to Maturity, Gross Unrealized Gains | 1,005,000 | 1,236,000
Held to Maturity, Gross Unrealized Losses | 0 | 0
Total held to maturity, Estimated Fair Value | 20,458,000 | 24,821,000
Available for Sale, Amortized Cost | 222,814,000 | 218,763,000
Available for Sale, Gross Unrealized Gains | 5,068,000 | 6,902,000
Available for Sale, Gross Unrealized Losses | 417,000 | 17,000
Available for Sale, Estimated Fair Value | $ 227,465,000 | $ 225,648,000

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