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Fair Value Measurements - Schedule of Assets Measured at Amortized Cost Net of Allowance For Credit Losses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value $ 525,637 $ 575,850
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 441,190 496,552
Corporate Bonds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value 63,155 57,843
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 4,151 5,000
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 17,053 16,347
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 88 108
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 17,053 16,347
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 17,053 16,347
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 508,584 559,503
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 441,190 496,552
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 63,155 57,843
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 4,151 5,000
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 $ 88 $ 108