Derivative Instruments (Impact Of Derivatives On Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other Assets (Prepaid Issuance Costs) [Member]
Derivative [Line Items]
Fair value of derivative assets	$ 40,004	$ 64,662
Other Liabilities [Member]
Derivative [Line Items]
Fair value of derivative liabilities	42,142	66,393
Not Designated As Hedging Instruments [Member] | Other Assets (Prepaid Issuance Costs) [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of derivative assets	38,482	61,869
Not Designated As Hedging Instruments [Member] | Other Assets (Prepaid Issuance Costs) [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets	1,522	2,793
Not Designated As Hedging Instruments [Member] | Other Assets (Prepaid Issuance Costs) [Member] | Other Contract [Member]
Derivative [Line Items]
Fair value of derivative assets	0	0
Not Designated As Hedging Instruments [Member] | Other Liabilities [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of derivative liabilities	39,436	62,912
Not Designated As Hedging Instruments [Member] | Other Liabilities [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Fair value of derivative liabilities	0	525
Not Designated As Hedging Instruments [Member] | Other Liabilities [Member] | Other Contract [Member]
Derivative [Line Items]
Fair value of derivative liabilities	$ 2,706	$ 2,956