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Income Taxes - Summary of Income Tax Expense (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
Income tax expense:                      
Current                 $ 14,714 $ 10,922 $ 8,701
Deferred                 10,174 1,941 666
Change in valuation allowance for deferred tax asset                 (10) (54) (946)
Income tax expense $ 8,327 $ 5,104 $ 5,331 $ 6,116 $ 4,134 $ 3,099 $ 2,679 $ 2,897 $ 24,878 $ 12,809 $ 8,421