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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