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Derivative Financial Instruments (Balance Sheet Category and Fair Values of Derivative Instruments (Cash Flow Hedges)) (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Feb. 05, 2016
Other Liabilities      
Derivatives, Fair Value [Line Items]      
Notional Amount     $ 2,000,000
Other Liabilities | Interest Rate Swap due March 17, 2021      
Derivatives, Fair Value [Line Items]      
Notional Amount $ 25,000,000 $ 25,000,000  
Fair Value $ (106,000) $ (447,000)  
Receive Rate 1.60% 0.993%  
Weighted Average Pay Rate 2.255% 2.255%  
Other Liabilities | Interest Rate Swap due March 1, 2017      
Derivatives, Fair Value [Line Items]      
Notional Amount   $ 20,000,000  
Fair Value   $ (114,000)  
Receive Rate   0.931%  
Weighted Average Pay Rate   3.22%  
Other Liabilities | Interest Rate Swap due January 7, 2020      
Derivatives, Fair Value [Line Items]      
Notional Amount $ 20,000,000 $ 20,000,000  
Fair Value $ (621,000) $ (1,145,000)  
Receive Rate 1.35% 0.868%  
Weighted Average Pay Rate 3.355% 3.355%  
Other Liabilities | Interest Rate Swap due March 26, 2019      
Derivatives, Fair Value [Line Items]      
Notional Amount   $ 10,000,000  
Fair Value   $ (42,000)  
Receive Rate   0.997%  
Weighted Average Pay Rate   1.674%  
Other Liabilities | Interest Rate Swap due March 18, 2019      
Derivatives, Fair Value [Line Items]      
Notional Amount   $ 10,000,000  
Fair Value   $ (41,000)  
Receive Rate   0.993%  
Weighted Average Pay Rate   1.658%  
Other Liabilities | Interest Rate Swap due June 15, 2024      
Derivatives, Fair Value [Line Items]      
Notional Amount $ 20,000,000 $ 20,000,000  
Fair Value $ (177,000) $ (214,000)  
Receive Rate 1.588% 0.00%  
Weighted Average Pay Rate 2.39% 2.39%  
Other Liabilities | Interest Rate Swap due March 1, 2024      
Derivatives, Fair Value [Line Items]      
Notional Amount $ 20,000,000 $ 20,000,000  
Fair Value $ (149,000) $ (262,000)  
Receive Rate 1.481% 0.00%  
Weighted Average Pay Rate 2.352% 2.352%  
Other Assets      
Derivatives, Fair Value [Line Items]      
Notional Amount $ 14,045,000 $ 14,549,000  
Other Assets | Interest Rate Swap due March 26, 2019      
Derivatives, Fair Value [Line Items]      
Notional Amount 10,000,000    
Fair Value $ 30,000    
Receive Rate 1.329%    
Weighted Average Pay Rate 1.674%    
Other Assets | Interest Rate Swap due March 18, 2019      
Derivatives, Fair Value [Line Items]      
Notional Amount $ 10,000,000    
Fair Value $ 29,000    
Receive Rate 1.60%    
Weighted Average Pay Rate 1.658%    
Other Assets | Interest Rate Swap due May 10, 2021      
Derivatives, Fair Value [Line Items]      
Notional Amount $ 33,667,000 37,667,000  
Fair Value $ 759,000 $ 530,000  
Receive Rate 3.932% 3.164%  
Weighted Average Pay Rate 3.674% 3.674%