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Income Taxes - Summarized Income Tax (Benefit) Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]                      
Current                 $ 6,123 $ 5,747 $ 7,260
Deferred                 137 2,137 2,512
NMTC                 (400) (400) 0
Impact of Tax Cuts and Jobs Act                 0 (789) 2,721
Total income tax expense $ 1,686 $ 1,303 $ 1,555 $ 1,316 $ 616 $ 2,107 $ 2,002 $ 1,970 $ 5,860 $ 6,695 $ 12,493