Income Taxes - Summary of Allocation of Federal and State Income Taxes Between Current and Deferred Portions (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current tax provision:                      
Federal                 $ 8,875 $ 7,269 $ 4,805
State                 2,420 1,842 1,185
Total current provision                 11,295 9,111 5,990
Deferred tax (benefit) provision:                      
Federal                 (2,514) (2,246) 500
State                 (710) (535) 111
Total deferred (benefit) provision                 (3,224) (2,781) 611
Total tax provision $ 2,232 $ 3,272 $ 1,200 $ 1,367 $ 1,079 $ 1,554 $ 2,639 $ 1,058 $ 8,071 $ 6,330 $ 6,601