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Derivative Financial Instruments (Fair Value Of Cash Flow Hedges) (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Interest rate swap    
Derivatives, Fair Value [Line Items]    
Notional amounts $ 22,860,000 $ 23,156,000
Nondesignated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Notional amounts 0  
Other Assets | Interest rate swap    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value 50,000 77,000
Other Long-Term Liabilities | Interest rate swap    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value $ 0 $ 0