Segments - Total Assets by Reportable Operating Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	$ 6,943,053	$ 6,318,354
Community Banking
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	6,930,712	6,305,046
Insurance
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	9,226	9,619
Wealth Management
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	$ 3,115	$ 3,689