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Derivative Instruments and Hedging Activities (Effect of Derivative Instruments on the Income Statement) (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income $ 354 $ 127 $ 606 $ 127
Interest Rate Swap [Member] | Net Gain on Derivative Instruments [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income 349   419  
Credit Contract [Member] | Net Gain on Derivative Instruments [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income $ 5 $ 127 $ 187 $ 127