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	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Asset Derivatives	$ 0	$ 0
Total return swap	3,407	11,785
Interest rate swap agreements [Member] | Other Assets [Member]
Derivative [Line Items]
Asset Derivatives	0	0
Interest rate swap agreements [Member] | Other liabilities [Member]
Derivative [Line Items]
Total return swap	3,285	11,525
Equity contracts [Member] | Other Assets [Member]
Derivative [Line Items]
Asset Derivatives	0	0
Equity contracts [Member] | Other liabilities [Member]
Derivative [Line Items]
Total return swap	$ 122	$ 260