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Income Taxes - Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 13,486 $ 17,557 $ 18,307
State 3,641 3,302 3,472
Current Income Tax Expense (Benefit), Total 17,127 20,859 21,779
Deferred:      
Federal 221 (5,895) (338)
State 90 (284) (267)
Deferred Income Tax Expense (Benefit), Total 311 (6,179) (605)
Total tax expense $ 17,438 $ 14,680 $ 21,174