Business Combinations, Goodwill and Intangible Assets Business Combinations, Goodwill and Intangible Assets (Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Business Combinations [Abstract]
Net Interest Income	$ 97,796	$ 96,269
Non-interest Income	32,655	32,042
Total Revenue	130,451	128,311
Provision for Loan Losses Expense	1,200	0
Non-interest Expense	74,231	76,415
Income Before Income Taxes	55,020	51,896
Income Tax Expense	16,089	14,029
Net Income	$ 38,931	$ 37,867
Earnings Per Share and Diluted Earnings Per Share	$ 2.55	$ 2.49