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Income Taxes - Total income tax provision (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current income tax provision:                      
Federal                 $ 18,644 $ 16,928 $ 12,460
State                 7,062 4,655 4,144
Total current income tax provision                 25,706 21,583 16,604
Deferred income tax provision (benefit):                      
Federal                 8,294 2,379 (887)
Effect of Tax Act                 5,633 0 0
State                 2,493 1,253 (508)
Total deferred income tax provision (benefit)                 16,420 3,632 (1,395)
Total income tax provision $ 19,370 $ 10,619 $ 7,521 $ 4,616 $ 7,238 $ 5,877 $ 6,358 $ 5,742 $ 42,126 $ 25,215 $ 15,209