Pending Acquisition Pending Acquisition (Narrative)(Details) - USD ($) $ / shares in Units, $ in Millions	Jun. 01, 2016	Jun. 30, 2016	Feb. 29, 2016
HIghland County Bankshares Inc and Subsidiary First and Citizens Bank [Member]
Business Acquisition [Line Items]
Business Acquisition, Share Price			$ 38.00
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets		$ 123
First Century Bankshares, Inc. [Member]
Business Acquisition [Line Items]
Business Acquisition, Share Price	$ 22.50
Business combination shares issued for each acquiree share	$ 1.2433
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets		$ 410
Percent of cash to be received in business combination	35.00%
Percent of stock to be received in business combination	65.00%