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Derivative Instruments and Hedging Activities (Narrative) (Details) (Interest Rate Swap [Member], USD $)
 12 Months Ended
Dec. 31, 2014
Interest Rate Swap [Member]
  
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 $ 7,000,000.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Agreement expiration date Dec. 01, 2016
Fixed interest rate of derivative 2.85%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember