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Loans and Asset Quality Information (Schedule of Applied Cost Recovery Method of Purchased Impaired Loans) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Purchased Credit Impaired Loans (substantially all of which are covered loans)    
Balance, beginning, carrying value $ 514 $ 1,970
Change due to payments received and accretion (6,016) (1,386)
Change due to loan charge-offs (12) (70)
Transfers to foreclosed real estate (69)
Other (392)
Balance, ending, carrying value 23,165 514
Carolina Bank [Member]    
Purchased Credit Impaired Loans (substantially all of which are covered loans)    
Additions due to acquisition 19,254
Asheville Savings Bank [Member]    
Purchased Credit Impaired Loans (substantially all of which are covered loans)    
Additions due to acquisition 9,886
Accretable Yield for PCI loans [Member]    
Purchased Credit Impaired Loans (substantially all of which are covered loans)    
Balance, beginning, carrying value
Accretion (1,846)
Reclassification from (to) nonaccretable difference 423
Other 690
Balance, ending, carrying value 4,688
Accretable Yield for PCI loans [Member] | Carolina Bank [Member]    
Purchased Credit Impaired Loans (substantially all of which are covered loans)    
Additions due to acquisition 3,617
Accretable Yield for PCI loans [Member] | Asheville Savings Bank [Member]    
Purchased Credit Impaired Loans (substantially all of which are covered loans)    
Additions due to acquisition $ 1,804