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Derivatives (Volume and Fair Value) (Details) - Interest Rate Cap - Other assets
$ in Thousands
Jun. 30, 2018
USD ($)
derivative_instrument
Dec. 31, 2017
USD ($)
derivative_instrument
Derivative [Line Items]    
Number of Instruments | derivative_instrument 1 1
Notional Amount $ 35,000 $ 35,000
Estimated Fair Value $ 2,588 $ 1,731