Premises and Equipment Text Details - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation	$ 8,106	$ 6,838	$ 6,590
Operating Leases, Rent Expense, Net	$ 21,400	$ 19,600	$ 19,000