Fair Value Of Assets And Liabilities (Summary Of Financial Assets Measured On A Nonrecurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets	$ 1,794	$ 1,001
Impaired loans | Quoted Prices in Active Markets for Identical Assets (Level I)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets	0	0
Impaired loans | Significant Other Observable Inputs (Level II)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets	0	0
Impaired loans | Significant Unobservable Inputs (Level III)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets	1,794	1,001
Foreclosed real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets	568	1,716
Foreclosed real estate | Quoted Prices in Active Markets for Identical Assets (Level I)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets	0	0
Foreclosed real estate | Significant Other Observable Inputs (Level II)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets	0	0
Foreclosed real estate | Significant Unobservable Inputs (Level III)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets	$ 568	$ 1,716