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Loans and Asset Quality Information (Schedule of Applied Cost Recovery Method of Purchased Impaired Loans) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Purchased Credit Impaired Loans    
Balance, beginning, carrying value $ 514 $ 1,970
Change due to payments received (5,585) (1,386)
Change due to loan charge-off   (70)
Transfer to foreclosed real estate (69)  
Additions due to acquisition of Carolina Bank 19,254  
Accretion 1,326  
Other (406)  
Balance, ending, carrying value 15,034 514
Accretable Yield [Member]    
Purchased Credit Impaired Loans    
Balance, beginning, Acrretable Yield  
Change due to payments received  
Transfer to foreclosed real estate  
Additions due to acquisition of Carolina Bank 3,617  
Accretion (1,326)  
Other  
Balance, Ending $ 2,291