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Derivatives and Hedging Activities (Fair Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Derivatives Not Designated as a Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 7,577 $ 7,159
Liability Derivatives 7,595 6,750
Derivatives Not Designated as a Hedging Instruments [Member] | Other Assets [Member] | Interest rate products [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 7,575 7,156
Derivatives Not Designated as a Hedging Instruments [Member] | Other Assets [Member] | Credit contracts [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 2 3
Derivatives Not Designated as a Hedging Instruments [Member] | Other Liabilities [Member] | Interest rate products [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives 7,595 6,750
Derivatives Not Designated as a Hedging Instruments [Member] | Other Liabilities [Member] | Credit contracts [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives 0 0
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 458 282
Liability Derivatives 0 0
Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest rate products [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 458 282
Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest rate products [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives $ 0 $ 0