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Derivative Financial Instruments (Fair value hedges) (Balance sheet category and fair values) (Details) - Other liabilities - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Feb. 05, 2016
Derivative [Line Items]      
Notional Amount     $ 2,000,000
Fair value hedges      
Derivative [Line Items]      
Notional Amount $ 35,436,000 $ 35,635,000  
Fair Value $ (105,000) $ (999,000)