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Acquisitions and Intangible Assets (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Oct. 26, 2012
Bank Acquisitions From Camden National Bank [Member]
    
Business Acquisition [Line Items]    
Deposit liabilities assumed in acquisition   $ 32,300,000
Assets [Abstract]    
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
Goodwill   2,121,000
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]    
2013 43,000  
2014 43,000  
2015 43,000  
2016 43,000  
2017 43,000  
Thereafter 217,000  
Total 432,000  
One time acquisition costs   251,000
Pro forma information [Abstract]    
Interest income 2,000  
Interest expense 21,000  
Net interest income (19,000)  
Non-interest income 36,000  
Non-interest expense 55,000  
Loss before taxes (38,000)  
Tax benefit (13,000)  
Net loss (25,000)  
FNB Bankshares [Member]
    
Business Acquisition [Line Items]    
Total value of transaction 47,955,000  
Assets [Abstract]    
Goodwill 27,559,000  
Acquisition in 2001 [Member]
    
Assets [Abstract]    
Goodwill $ 125,000