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Derivative Instruments and Hedging Activities (Fair Values of Derivative Instruments on the Balance Sheet) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Gross notional amount $ 100,000  
Asset derivatives 899  
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Gross notional amount 34,880 $ 12,282
Liability derivatives 21 4
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Gross notional amount 100,000  
Asset derivatives 899  
Credit Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Gross notional amount 34,880 12,282
Liability derivatives $ 21 $ 4