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Investments - Summary of Fixed Maturities with Unrealized Losses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value $ 178,424 $ 67,740
Less Than 12 Months, Unrealized Losses 2,666 629
More Than 12 Months, Fair Value 3,862 8,466
More Than 12 Months, Unrealized Losses 127 277
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 38,202 29,144
Less Than 12 Months, Unrealized Losses 1,088 345
Obligations of States and Political Subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 45,446 9,362
Less Than 12 Months, Unrealized Losses 819 154
More Than 12 Months, Fair Value 0  
More Than 12 Months, Unrealized Losses 0  
Corporate Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 38,846 26,143
Less Than 12 Months, Unrealized Losses 344 115
More Than 12 Months, Fair Value 3,375 8,230
More Than 12 Months, Unrealized Losses 125 276
Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 55,930 3,091
Less Than 12 Months, Unrealized Losses 415 15
More Than 12 Months, Fair Value 487 236
More Than 12 Months, Unrealized Losses $ 2 $ 1