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Derivative Financial Instruments (Fair value hedges) (Balance sheet category and fair values) (Details) - Other liabilities - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Feb. 05, 2016
Derivative [Line Items]      
Notional Amount     $ 2,000,000
Fair value hedges      
Derivative [Line Items]      
Notional Amount $ 35,813,000 $ 40,807,000  
Fair Value $ (1,537,000) $ (1,626,000)