Fair Values Of Assets And Liabilities (Narrative) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, assets	$ 0	$ 0
Fair value, liabilities	0	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, assets	0	0
Fair value, liabilities	$ 0	$ 0