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Merger with Middleburg Financial Corporation - Loans Identified as Impaired at Acquisition Date (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Apr. 01, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Contractual principal and interest at acquisition   $ 7,835  
Nonaccretable difference   (3,427)  
Expected cash flows at acquisition   4,408  
Accretable yield $ (244) (186) $ 0
Fair value of purchased impaired loans   4,222  
Middleburg Financial Corporation      
Business Acquisition [Line Items]      
Contractual principal and interest at acquisition   7,800  
Nonaccretable difference   $ (3,400)