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Income Taxes - Components of Income Tax Provision (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
Federal $ 1,988 $ 12,328 $ 31,981
State and local 349 2,703 7,581
Total current expense 2,337 15,031 39,562
Deferred:      
Federal 2,403 1,622 (3,487)
State and local 386 350 (253)
Total deferred expense (benefit) 2,789 1,972 (3,740)
Income tax expense $ 5,126 $ 17,003 $ 35,822