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Subsequent Events (Narrative) (Details) - Subsequent Event [Member] - Lake Sunapee Bank Group [Member] $ in Millions | May. 05, 2016 USD ($) item
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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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