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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Federal income tax statutory rate |  | 21.00% | 35.00% |
Charge to write-down the DTA | $ 2,700 |  |  |
Portion of retained earnings not treated for deferred federal income tax liability |  | $ 5,837 |  | $ 5,837
Unrecorded deferred income tax liability |  | $ 1,985 |  | $ 1,985

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