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Fair Values of Financial Instruments - Schedule of Assets Measured at Amortized Cost (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | $ 621,654 | $ 621,343
States and Political Subdivisions [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 526,821 | 485,647
Corporate Bonds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 72,900 | 110,925
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 7,906 | 11,511
U.S. Treasury Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 13,865 | 7,873
Asset-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 162 | 219
Obligations of U.S. Government Agencies [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value |  | 5,168
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 13,865 | 7,873
Fair Value, Inputs, Level 1 [Member] | U.S. Treasury Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 13,865 | 7,873
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 607,789 | 613,470
Fair Value, Inputs, Level 2 [Member] | States and Political Subdivisions [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 526,821 | 485,647
Fair Value, Inputs, Level 2 [Member] | Corporate Bonds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 72,900 | 110,925
Fair Value, Inputs, Level 2 [Member] | U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | 7,906 | 11,511
Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value | $ 162 | 219
Fair Value, Inputs, Level 2 [Member] | Obligations of U.S. Government Agencies [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Securities held-to-maturity-fixed maturity, Fair Value |  | $ 5,168

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