Business Combinations Branch Acquisitions Liabilities and Assets Acquired (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 04, 2016
Business Acquisition [Line Items]
Goodwill	$ 85,852	$ 85,852
Bank Of America, Branch Locations
Business Acquisition [Line Items]
Cash and cash equivalents			$ 456,611
Premises and equipment, net			3,113
Core deposit intangibles			6,427
Goodwill			3,984
Other assets			463
Total assets			470,598
Deposits			469,889
Other liabilities			709
Total liabilities			$ 470,598