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Summary of Securities with Gross Unrealized Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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U.S. Treasury and Agency Obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total, Gross Unrealized Losses |  | $ (215) |
Obligations of States and Political Subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total, Gross Unrealized Losses |  | (188) |
Mortgage Backed Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total, Gross Unrealized Losses |  | (1,120) |
Asset-backed Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total, Gross Unrealized Losses |  | (1,001) |
Commercial Mortgage-Backed Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total, Gross Unrealized Losses |  | (804) |
Corporate Bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total, Gross Unrealized Losses |  | (1,135) |
Foreign Corporate Bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total, Gross Unrealized Losses |  | (204) |
Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair Value |  | 221,465 | $ 249,721
Less than 12 months, Gross Unrealized Losses |  | (4,181) | (1,774)
12 months or longer, Fair Value |  | 12,363 | 21,034
12 months or longer, Gross Unrealized Losses |  | (486) | (276)
Total, Fair Value | [1] | 233,828 | 270,755
Total, Gross Unrealized Losses | [1] | (4,667) | (2,050)
Fixed Maturities | U.S. Treasury and Agency Obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair Value |  | 37,486 | 35,633
Less than 12 months, Gross Unrealized Losses |  | (215) | (797)
12 months or longer, Fair Value |  | 0 | 0
12 months or longer, Gross Unrealized Losses |  | 0 | 0
Total, Fair Value | [1] | 37,486 | 35,633
Total, Gross Unrealized Losses | [1] | (215) | (797)
Fixed Maturities | Obligations of States and Political Subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair Value |  | 2,471 | 27,180
Less than 12 months, Gross Unrealized Losses |  | (188) | (271)
12 months or longer, Fair Value |  | 0 | 0
12 months or longer, Gross Unrealized Losses |  | 0 | 0
Total, Fair Value | [1] | 2,471 | 27,180
Total, Gross Unrealized Losses | [1] | (188) | (271)
Fixed Maturities | Mortgage Backed Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair Value |  | 97,405 | 93,579
Less than 12 months, Gross Unrealized Losses |  | (1,017) | (244)
12 months or longer, Fair Value |  | 1,421 | 902
12 months or longer, Gross Unrealized Losses |  | (103) | (7)
Total, Fair Value | [1] | 98,826 | 94,481
Total, Gross Unrealized Losses | [1] | (1,120) | (251)
Fixed Maturities | Asset-backed Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair Value |  | 31,769 | 43,402
Less than 12 months, Gross Unrealized Losses |  | (733) | (167)
12 months or longer, Fair Value |  | 9,916 | 16,152
12 months or longer, Gross Unrealized Losses |  | (268) | (253)
Total, Fair Value | [1] | 41,685 | 59,554
Total, Gross Unrealized Losses | [1] | (1,001) | (420)
Fixed Maturities | Commercial Mortgage-Backed Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair Value |  | 12,098 | 25,698
Less than 12 months, Gross Unrealized Losses |  | (689) | (196)
12 months or longer, Fair Value |  | 1,026 | 1,945
12 months or longer, Gross Unrealized Losses |  | (115) | (13)
Total, Fair Value | [1] | 13,124 | 27,643
Total, Gross Unrealized Losses | [1] | (804) | (209)
Fixed Maturities | Corporate Bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair Value |  | 28,337 | 19,407
Less than 12 months, Gross Unrealized Losses |  | (1,135) | (79)
12 months or longer, Fair Value |  | 0 | 0
12 months or longer, Gross Unrealized Losses |  | 0 | 0
Total, Fair Value | [1] | 28,337 | 19,407
Total, Gross Unrealized Losses | [1] | (1,135) | (79)
Fixed Maturities | Foreign Corporate Bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair Value |  | 11,899 | 4,822
Less than 12 months, Gross Unrealized Losses |  | (204) | (20)
12 months or longer, Fair Value |  | 0 | 2,035
12 months or longer, Gross Unrealized Losses |  | 0 | (3)
Total, Fair Value | [1] | 11,899 | 6,857
Total, Gross Unrealized Losses | [1] | $ (204) | $ (23)
[1] | Fixed maturities in a gross unrealized loss position are comprised of non-credit losses on investment grade securities where management does not intend to sell, and it is more likely than not that the Company will not be forced to sell the security before recovery.

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