Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Finite lived intangible asset, amortization (in years)	10 years
Amortization of identified intangibles	$ 326	$ 326	$ 283
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	43,000
Amortization of Intangible Assets, Yearly Expense till Fully Amortized	43
FNB Bankshares | Core Deposits
Business Acquisition [Line Items]
Amortization of identified intangibles	283	283	283
Amortization of Intangible Assets - FNB Bankshares	$ 14