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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Amortized Cost $ 1,260,439 $ 1,231,568
Fixed maturities, Allowance for Credit Losses 0  
Fixed maturities, Gross Unrealized Gains 48,003 23,641
Fixed maturities, Gross Unrealized losses (4,667) (2,050)
Fixed maturities, Estimated Fair Value 1,303,775 1,253,159
U.S. Treasury and Agency Obligations    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Amortized Cost 197,192 153,906
Fixed maturities, Allowance for Credit Losses 0  
Fixed maturities, Gross Unrealized Gains 4,980 3,580
Fixed maturities, Gross Unrealized losses (215) (797)
Fixed maturities, Estimated Fair Value 201,957 156,689
Obligations of States and Political Subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Amortized Cost 59,134 63,256
Fixed maturities, Allowance for Credit Losses 0  
Fixed maturities, Gross Unrealized Gains 3,055 853
Fixed maturities, Gross Unrealized losses (188) (271)
Fixed maturities, Estimated Fair Value 62,001 63,838
Mortgage Backed Securities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Amortized Cost 393,325 325,448
Fixed maturities, Allowance for Credit Losses 0  
Fixed maturities, Gross Unrealized Gains 8,879 3,177
Fixed maturities, Gross Unrealized losses (1,120) (251)
Fixed maturities, Estimated Fair Value 401,084 328,374
Asset-backed Securities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Amortized Cost 137,953 168,020
Fixed maturities, Allowance for Credit Losses 0  
Fixed maturities, Gross Unrealized Gains 2,198 937
Fixed maturities, Gross Unrealized losses (1,001) (420)
Fixed maturities, Estimated Fair Value 139,150 168,537
Commercial Mortgage-Backed Securities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Amortized Cost 132,271 183,944
Fixed maturities, Allowance for Credit Losses 0  
Fixed maturities, Gross Unrealized Gains 7,444 4,369
Fixed maturities, Gross Unrealized losses (804) (209)
Fixed maturities, Estimated Fair Value 138,911 188,104
Corporate Bonds    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Amortized Cost 243,082 239,860
Fixed maturities, Allowance for Credit Losses 0  
Fixed maturities, Gross Unrealized Gains 16,914 8,478
Fixed maturities, Gross Unrealized losses (1,135) (79)
Fixed maturities, Estimated Fair Value 258,861 248,259
Foreign Corporate Bonds    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Amortized Cost 97,482 97,134
Fixed maturities, Allowance for Credit Losses 0  
Fixed maturities, Gross Unrealized Gains 4,533 2,247
Fixed maturities, Gross Unrealized losses (204) (23)
Fixed maturities, Estimated Fair Value $ 101,811 $ 99,358