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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Finite lived intangible asset, amortization (in years) 10 years    
Amortization of identified intangibles $ 58 $ 326 $ 326
Bank Acquisitions From Camden National Bank | Core Deposits      
Business Acquisition [Line Items]      
Finite lived intangible asset, amortization (in years) 10 years    
Amortization of identified intangibles $ 43 43 43
Yearly amortization expense until fully amortized 43    
FNB Bankshares | Core Deposits      
Business Acquisition [Line Items]      
Amortization expense - FNB Bankshares $ 14    
Amortization of identified intangibles   $ 283 $ 283