Derivative Instruments (Change In Fair Value Of Derivative Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Non-hedging interest rate derivatives: | Other Expense
Derivatives, Fair Value [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 32		$ 123	$ 24
Non-hedging interest rate derivatives: | Other Income
Derivatives, Fair Value [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments		$ (22)
Derivatives designated as hedges of fair value: | Other Expense
Derivatives, Fair Value [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 3	$ 5	$ 2	$ 9