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Merger And Acquisition Activity (Narrative) (Details) - Lake Sunapee Bank Group [Member]
$ in Thousands
 3 Months Ended 6 Months Ended
May 05, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
item
Business Acquisition [Line Items]      
Date of acquisition agreement     May 05, 2016
Acquisition, all-stock transaction value $ 143,000    
Acquisition, pro forma market cap 350,000    
Number of branches | item     49
Acquisition, non-recurring expenses   $ 492 $ 492
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