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Subsequent Events (Narrative) (Details) - Subsequent Event [Member] - Lake Sunapee Bank Group [Member] $ in Millions	May. 05, 2016 USD ($) item
Business Acquisition [Line Items]
Date of acquisition agreement	May 05, 2016
Acquisition, transaction value	$ 143
Acquisition, pro forma market cap	$ 350
Number of branches | item	50
Deposits [Member]
Business Acquisition [Line Items]
Acquisition, assets acquired	$ 2,200
Loans [Member]
Business Acquisition [Line Items]
Acquisition, liabilities assumed	2,400
Assets [Member]
Business Acquisition [Line Items]
Acquisition, assets acquired	3,300
Assets Under Management [Member]
Business Acquisition [Line Items]
Acquisition, assets acquired	$ 2,000

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
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