Derivative Financial Instruments (Summary Of Location And Amounts Of Derivative Fair Values In The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivative Financial Instruments [Line Items]
Asset Derivatives	$ 0	$ 667
Liability Derivatives	1,323	785
Not Designated as Hedging Instrument [Member] | Interest rate swap agreements [Member] | Other Assets [Member]
Derivative Financial Instruments [Line Items]
Asset Derivatives	0	667
Liability Derivatives	0	0
Not Designated as Hedging Instrument [Member] | Interest rate swap agreements [Member] | Other liabilities [Member]
Derivative Financial Instruments [Line Items]
Asset Derivatives	0	0
Liability Derivatives	1,200	765
Not Designated as Hedging Instrument [Member] | Equity contracts [Member] | Other liabilities [Member]
Derivative Financial Instruments [Line Items]
Asset Derivatives	0	0
Liability Derivatives	$ 123	$ 20