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Components of Income Tax Provision (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current tax expense (benefit):                      
Federal                 $ 13,634 $ (254) $ 7,234
State                 675 581 1,325
Total current tax expense                 14,309 327 8,559
Deferred tax expense (benefit):                      
Federal                 (1,480) 10,034 2,971
State                 (10) 1,020 794
Total deferred tax expense (benefit)                 (1,490) 11,054 3,765
Total income tax expense $ 3,638 $ 3,230 $ 3,022 $ 2,929 $ 2,993 $ 3,084 $ 2,467 $ 2,837 $ 12,819 $ 11,381 $ 12,324