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Acquisitions and Intangible Assets - Additional Information (Details) (USD $) In Thousands, unless otherwise specified |  |  |  | 0 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Oct. 26, 2012 Bank Acquisition From Camden National Bank [Member] | Jan. 14, 2005 FNB Bankshares [Member] | Jun. 30, 2014 Acquisition In 2011 [Member]
Business Acquisition [Line Items] |  |  |  |  |  |
Deposits and loans acquired |  |  |  | $ 32,300 |  |
Price premium |  |  |  | 2,553 |  |
Core deposit intangible |  |  |  | 432 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 10 years |  |
Goodwill | 29,805 | 29,805 | 29,805 | 2,121 | 27,559 | 125
Total value of consideration |  |  |  |  | $ 47,955 |

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