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Summary of Significant Accounting Policies (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]        
Finite lived intangible asset, amortization (in years)   10 years    
Amortization of identified intangibles   $ 43 $ 43 $ 43
Net tax deferred assets $ 134      
Number of reportable operating segments | segment   1    
Bank Acquisitions From Camden National Bank | Core Deposits        
Business Acquisition [Line Items]        
Amortization of identified intangibles   $ 43 $ 43 $ 43
Yearly amortization expense until fully amortized   $ 43