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Acquisitions and Intangible Assets - Additional Information (Details) (USD $) In Thousands, unless otherwise specified				0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Oct. 26, 2012 Bank Acquisition From Camden National Bank [Member]	Jan. 14, 2005 FNB Bankshares [Member]	Sep. 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
Total value of consideration					47,955
Goodwill	$ 29,805	$ 29,805	$ 29,805	$ 2,121	$ 27,559	$ 125

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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- Definition

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

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- Definition

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

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- Definition

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.

+ References

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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