Business Combinations Branch Acquisitions Liabilities and Assets Acquired (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 04, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 84,775		$ 78,610
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