Derivatives And Hedging (Summary Of Fair Value Interest Rate Contracts Activity (Details) - Fair Value Hedging [Member] - Interest Rate Contracts [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 24, 2016 derivative_contract
Derivatives, Fair Value [Line Items]
Proceeds from extinguishment of derivative instrument	$ 2,200
Number of interest rate derivatives terminated | derivative_contract				2
Interest Expense, Net [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) on Contracts	(418)	$ (1,228)	$ (1,386)
Gain (Loss) on Borrowings	418	1,228	1,386
Net Settlements and Accruals on Contracts	3,140	2,030	2,179
Amount of Gain (Loss) Recognized in Income	$ 3,140	$ 2,030	$ 2,179