Premises and Equipment - Summary of Rental Expense Charged to Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Leases, Rent Expense, Net [Abstract]
Rental expense	$ 3,791	$ 3,167	$ 2,732
Sublease rental income	(138)	(195)	(238)
Net rental expense	$ 3,653	$ 2,972	$ 2,494