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Loans and Asset Quality Information (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Oct. 01, 2017
Mar. 03, 2017
Recorded loans with a fair value       $ 606,200 $ 497,500
Loans pledged as collateral $ 3,600,000 $ 2,400,000      
Loans to officers and directors 3,600 2,600      
Additions to loans, officers and directors 600        
Payments that exceeded the initial carrying amount on purchased impaired loans 1,064 1,160      
Discount accretion loan interest income - purchased impaired loans paid off 962 786      
Additional loan interest income - purchased impaired loans paid off 102 296      
Recoveries   78      
Interest income on non accrual loans 415 266 $ 575    
Interest income on restructured loans 297 423 1,392    
Real estate - mortgage - residential (1-4 family) first mortgages [Member]          
Nonaccrual loans in process of foreclosure 800 1,700      
Non Accrual Loans [Member]          
Interest income forgone 1,503 1,893 3,213    
Restructured Loans [Member]          
Interest income forgone 1,182 1,417 $ 2,044    
Purchased Impaired Loans [Member]          
Recorded loans with a fair value       $ 9,900 $ 19,300
Accretion of loan discount 21,500 $ 12,100      
Purchased Impaired Loans [Member] | Carolina Bank Holdings, Inc. [Member] | 90 Days or More Past Due [Member]          
Recorded loans with a fair value $ 600