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Loans and Asset Quality Information (Schedule of Applied Cost Recovery Method of Purchased Impaired Loans) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Purchased impaired loans    
Balance, beginning, carrying value $ 514 $ 1,970
Change due to payments received (3,317) (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 871  
Other (407)  
Balance, ending, carrying value 16,846 514
Accretable Yield [Member]    
Purchased 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 (871)  
Other  
Balance, Ending $ 2,746