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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

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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