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Derivatives (Summary of Derivative Instruments) (Details) - Interest Rate Swap [Member]
$ in Thousands
Jun. 30, 2018
USD ($)
Rate
Effective September 1, 2016 through September 1, 2021 [Member]  
Derivative [Line Items]  
Notional Amount $ 25,000
Fixed Interest Rate | Rate 3.105%
Effective September 1, 2015 through September 1, 2021 [Member]  
Derivative [Line Items]  
Notional Amount $ 25,000
Fixed Interest Rate | Rate 3.304%
Effective November 7, 2014 through November 7, 2024 [Member]  
Derivative [Line Items]  
Notional Amount $ 6,838 [1]
Fixed Interest Rate | Rate 4.50%
Derivative, Amortizing Notional Amount $ 35
Effective January 7, 2017 through January 7, 2025 [Member]  
Derivative [Line Items]  
Notional Amount $ 5,215 [2]
Fixed Interest Rate | Rate 4.30%
Derivative, Amortizing Notional Amount $ 26
[1] Interest rate swap notional amount amortizes by $35 monthly to maturity.
[2] Interest rate swap notional amount amortizes by $26 monthly to maturity.