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Acquisitions and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	Oct. 26, 2012	Jan. 14, 2005	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Business Acquisition [Line Items]
Goodwill			$ 29,805	$ 29,805	$ 29,805
Bank Acquisition From Camden National Bank
Business Acquisition [Line Items]
Deposits and loans acquired	$ 32,300
Price premium	2,553
Core deposit intangible	$ 432
Average life of acquired core deposits	10 years
Goodwill	$ 2,121
FNB Bankshares
Business Acquisition [Line Items]
Goodwill		$ 27,559
Total value of consideration		$ 47,955
Acquisition In 2011
Business Acquisition [Line Items]
Goodwill				$ 125

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- 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, 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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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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