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Investments - Summary of Fixed Maturities with Unrealized Losses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value $ 245,366 $ 67,740
Less Than 12 Months, Unrealized Losses 3,361 629
More Than 12 Months, Fair Value 27,340 8,466
More Than 12 Months, Unrealized Losses 1,015 277
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 36,355 29,144
Less Than 12 Months, Unrealized Losses 566 345
More Than 12 Months, Fair Value 17,458  
More Than 12 Months, Unrealized Losses 540  
Obligations of States and Political Subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 77,320 9,362
Less Than 12 Months, Unrealized Losses 1,327 154
More Than 12 Months, Fair Value 6,532  
More Than 12 Months, Unrealized Losses 189  
Corporate Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 56,319 26,143
Less Than 12 Months, Unrealized Losses 726 115
More Than 12 Months, Fair Value 3,217 8,230
More Than 12 Months, Unrealized Losses 283 276
Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 75,372 3,091
Less Than 12 Months, Unrealized Losses 742 15
More Than 12 Months, Fair Value 133 236
More Than 12 Months, Unrealized Losses $ 3 $ 1