Derivative Instruments (Impact Of Derivatives On Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Other Assets [Member]
Derivative [Line Items]
Fair value of derivative assets	$ 78,358	$ 84,923
Other Liabilities [Member]
Derivative [Line Items]
Fair value of derivative liabilities	80,906	96,574
Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Fair value of derivative assets	0	0
Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Fair value of derivative liabilities	0	0
Not Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Fair value of derivative assets	78,358	84,923
Not Designated As Hedging Instruments [Member] | Other Assets [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of derivative assets	74,471	83,072
Not Designated As Hedging Instruments [Member] | Other Assets [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets	3,887	1,851
Not Designated As Hedging Instruments [Member] | Other Assets [Member] | Visa Derivative[Member]
Derivative [Line Items]
Fair value of derivative assets	0	0
Not Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Fair value of derivative liabilities	80,906	96,574
Not Designated As Hedging Instruments [Member] | Other Liabilities [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of derivative liabilities	75,761	85,534
Not Designated As Hedging Instruments [Member] | Other Liabilities [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Fair value of derivative liabilities	2,095	1,947
Not Designated As Hedging Instruments [Member] | Other Liabilities [Member] | Visa Derivative[Member]
Derivative [Line Items]
Fair value of derivative liabilities	3,050	9,093
Cash Flow Hedges [Member] | Designated As Hedging Instruments [Member] | Other Assets [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of derivative assets	0	0
Cash Flow Hedges [Member] | Designated As Hedging Instruments [Member] | Other Liabilities [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of derivative liabilities	$ 0	$ 0