Derivative Financial Instruments (Summary Of Location And Amounts Of Derivative Fair Values In The Consolidated Balance Sheets) (Details) - Non-hedging derivatives [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Asset Derivatives	$ 0	$ 667
Liability Derivatives	1,829	785
Total Return Swap [Member] | Other Assets [Member]
Derivative [Line Items]
Asset Derivatives	0	667
Liability Derivatives	0	0
Total Return Swap [Member] | Other liabilities [Member]
Derivative [Line Items]
Asset Derivatives	0	0
Liability Derivatives	1,725	765
Option contracts [Member] | Other liabilities [Member]
Derivative [Line Items]
Asset Derivatives	0	0
Liability Derivatives	$ 104	$ 20