Derivative Instruments (Impact Of Derivatives On Balance Sheet) (Details) - Not Designated As Hedging Instruments [Member] - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Other Assets [Member]
Derivative [Line Items]
Fair value of derivative assets	$ 39,345	$ 27,139
Other Assets [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of derivative assets	36,804	25,580
Other Assets [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets	2,541	1,559
Other Assets [Member] | Visa Derivative[Member]
Derivative [Line Items]
Fair value of derivative assets	0	0
Other Liabilities [Member]
Derivative [Line Items]
Fair value of derivative liabilities	40,103	27,445
Other Liabilities [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of derivative liabilities	37,221	26,030
Other Liabilities [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Fair value of derivative liabilities	1,467	0
Other Liabilities [Member] | Visa Derivative[Member]
Derivative [Line Items]
Fair value of derivative liabilities	$ 1,415	$ 1,415