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Acquisitions and Intangible Assets - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Jun. 30, 2012
Bank Acquisition From Camden National Bank [Member]
Oct. 26, 2012
Bank Acquisition From Camden National Bank [Member]
Jan. 14, 2005
FNB Bankshares [Member]
Dec. 31, 2012
Acquisition In 2011 [Member]
Business Acquisition [Line Items]              
Deposits and loans acquired         $ 32,300    
Price premium         2,600    
Core deposit intangible         432    
Total value of consideration           47,955  
Goodwill $ 29,805 $ 29,805 $ 27,684   $ 2,121 $ 27,559 $ 125
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life       10 years