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Goodwill and Other Intangible Assets - Schedule of Change in Balance for Core Deposit Intangibles (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite Lived Intangible Assets [Line Items]      
Beginning Balance $ 6,695    
Less: amortization expense (2,132) $ (1,731) $ (1,613)
Ending Balance 4,563 6,695  
Core Deposits      
Finite Lived Intangible Assets [Line Items]      
Beginning Balance 6,695 3,495 5,108
Less: amortization expense (2,132) (1,731) (1,613)
Ending Balance $ 4,563 6,695 $ 3,495
Core Deposits | Northwest Georgia Bank      
Finite Lived Intangible Assets [Line Items]      
Addition from merger with NWGB   $ 4,931