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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2011
Apr. 30, 2006
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]          
Amortization expense     $ 964 $ 1,201 $ 1,114
Community First          
Acquired Finite-Lived Intangible Assets [Line Items]          
Core deposit intangible   $ 3,112      
Amortization period of intangible   99 months      
MidCarolina          
Acquired Finite-Lived Intangible Assets [Line Items]          
Core deposit intangible $ 6,556        
Amortization period of intangible 108 months        
MainStreet BankShares, Inc.          
Acquired Finite-Lived Intangible Assets [Line Items]          
Core deposit intangible     $ 1,839 $ 1,839  
Amortization period of intangible     120 months