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Derivative Instruments (Fair Value) (Details) - Designated as cash flow hedge - Interest rate swap - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Notional Amounts $ 20,781 $ 21,969
Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value $ 31 $ 16