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Acquisitions and Intangible Assets (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Oct. 26, 2012
Dec. 31, 2013
Bank Acquisitions From Camden National Bank
Oct. 26, 2012
Bank Acquisitions From Camden National Bank
Jan. 14, 2005
FNB Bankshares
Dec. 31, 2013
Acquisition in 2001
Dec. 31, 2013
Core Deposits
Dec. 31, 2013
Core Deposits
Bank Acquisitions From Camden National Bank
Dec. 31, 2013
Core Deposits
FNB Bankshares
Dec. 31, 2012
Core Deposits
FNB Bankshares
Dec. 31, 2011
Core Deposits
FNB Bankshares
Business Acquisition [Line Items]                          
Business Combination Recognized Liabilities Assumed Deposits           $ 32,300,000              
Assets                          
Cash           25,297,000              
Loans           224,000              
Bank premises and equipment           3,776,000              
Accrued interest receivable and other assets           24,000              
Core deposit intangible       432,000   432,000              
Goodwill       2,121,000   2,121,000 27,559,000            
Liabilities [Abstract]                          
Deposits           31,858,000              
Accrued interest and other liabilities           16,000              
Business combination purchase premium           2,553,000              
Future amortization expense of core deposits acquired [Abstract]                          
2014         43,000                
2015         43,000                
2016         43,000                
2017         43,000                
2018         43,000                
Thereafter         174,000                
Total         389,000                
Amortization of identified intangibles 326,000 283,000 283,000           43,000 43,000 283,000 283,000 283,000
One time acquisition costs             47,955,000            
Goodwill $ 29,805,000 $ 29,805,000           $ 125,000