Derivative Financial Instruments (Summary Of Fair Value Of Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Total derivative assets	$ 36,512	$ 44,415
Total derivative liabilities	30,010	37,332
Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivative assets	6,458	7,444
Designated As Hedging Instruments [Member] | Other Assets [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Total derivative assets	6,458	7,444
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivative assets	30,054	36,971
Total derivative liabilities	30,010	37,332
Derivatives Not Designated As Hedging Instruments [Member] | Other Assets [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Total derivative assets	29,475	36,755
Derivatives Not Designated As Hedging Instruments [Member] | Other Assets [Member] | Mortgage Contracts [Member]
Derivative [Line Items]
Total derivative assets	579	216
Derivatives Not Designated As Hedging Instruments [Member] | Other Liabilities [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Total derivative liabilities	29,909	37,332
Derivatives Not Designated As Hedging Instruments [Member] | Other Liabilities [Member] | Mortgage Contracts [Member]
Derivative [Line Items]
Total derivative liabilities	$ 101	$ 0