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Merger And Acquisition Activity (Narrative) (Details) - Lake Sunapee Bank Group [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 05, 2016
Sep. 30, 2016
Sep. 30, 2016
Business Acquisition [Line Items]      
Date of acquisition agreement     May 05, 2016
Acquisition, all-stock transaction value $ 143,000    
Acquisition, non-interest expense   $ 320 $ 812
Acquisition, not tax deductible non-interest expense   $ 256 $ 725
Assets [Member]      
Business Acquisition [Line Items]      
Acquisition, assets acquired 3,300,000    
Assets Under Management [Member]      
Business Acquisition [Line Items]      
Acquisition, assets acquired 2,000,000    
Loans [Member]      
Business Acquisition [Line Items]      
Acquisition, liabilities assumed 2,400,000    
Deposits [Member]      
Business Acquisition [Line Items]      
Acquisition, assets acquired $ 2,200,000