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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in income $ 78 $ 252
Interest Rate Swap [Member] | Net Gain on Derivative Instruments [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in income 70 70
Credit Contract [Member] | Net Gain on Derivative Instruments [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in income $ 8 $ 182