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Acquisitions and Intangible Assets - Additional Information (Details) (USD $)				3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 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					$ 32,300,000
Price premium					2,600,000
Core deposit intangible					432,000
Total value of consideration						47,955,000
Goodwill	29,805,000	29,805,000	27,684,000		2,121,000	27,559,000	125,000
Goodwill, Impaired, Accumulated Impairment Loss		$ 0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				10 years

X

- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Consideration Paid In Excess Of Identifiable Carrying Value Of Assets And Liabilities

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Deposits And Loans

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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The accumulated impairment losses related to goodwill as of the balance sheet date.

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