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Derivative Instruments and Hedging Activities (Narrative) (Details) - Interest Rate Swap [Member] - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 29, 2015
Derivative [Line Items]        
Agreement related to the outstanding trust preferred capital notes, date Dec. 04, 2008      
Agreement effective, date Dec. 01, 2008      
Notional amount of derivatives $ 7,000,000.0      
Agreement expiration date Dec. 01, 2016      
Fixed interest rate of derivative 2.85%      
Other Liabilities [Member]        
Derivative [Line Items]        
Derivative Instruments in Hedges, Liabilities, at Fair Value       $ 237,000
Cash Flow Hedging [Member]        
Derivative [Line Items]        
Amount of Gain (Loss) Recognized in Income $ 0 $ 149,000 $ 88,000