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Pending Acquisition Pending Acquisition (Narrative)(Details) - USD ($)
$ / shares in Units, $ in Millions
Oct. 01, 2016
Jun. 01, 2016
Sep. 30, 2016
HIghland County Bankshares Inc and Subsidiary First and Citizens Bank [Member]      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross $ 21.8    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets     $ 123.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities     107.0
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     $ 413.0
Percent of cash to be received in business combination   35.00%  
Percent of stock to be received in business combination   65.00%