Acquisitions and Divestiture (Schedule of Merger-Related Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
FNBC Transactions [Member]
Business Acquisition [Line Items]
Personnel expense	$ 1,257
Net occupancy and equipment expense	309
Professional services expense	2,827
Data processing expense	1,583
Advertising expense	52
Other expense	159
Total merger-related expenses	$ 6,187
Trust And Asset Management Acquisition [Member]
Business Acquisition [Line Items]
Personnel expense		$ 3,662
Net occupancy and equipment expense		777
Professional services expense		9,681
Data processing expense		974
Other real estate		(1,511)
Advertising expense		1,389
Other expense		4,398
Total merger-related expenses		$ 19,370