Income Taxes - Schedule of Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current income tax expense:
Federal	$ 17,910	$ 19,404	$ 20,533
State	2,322	3,252	3,094
Current income tax expense	20,232	22,656	23,627
Deferred tax expense:
Federal	(241)	2,623	1,858
State	81	(129)	160
Deferred tax expense	(160)	2,494	2,018
Income Tax Expense	$ 20,072	$ 25,150	$ 25,645