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Acquisitions and Intangible Assets (Details) (USD $) | 12 Months Ended |  |  |  |  |  | 12 Months Ended
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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 |  |  |  |  |

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