Acquisitions (Schedule of Merger-Related Expense) (Details) - FNBC Transaction [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Personnel expense	$ 2,120	$ 3,662
Net occupancy and equipment expense	500	777
Professional services expense	2,854	9,681
Data processing expense	929	974
Other real estate		(1,511)
Advertising expense	358	1,389
Other expense	2,132	4,398
Total merger-related expenses	$ 8,893	$ 19,370