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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

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- 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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