Derivative Instruments (Impact Of Derivatives On Balance Sheet) (Details) - Not Designated As Hedging Instruments [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Other Assets [Member]
Derivative [Line Items]
Fair value of derivative assets	$ 35,958	$ 27,139
Other Assets [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of derivative assets	33,788	25,580
Other Assets [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets	2,170	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	36,409	27,445
Other Liabilities [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of derivative liabilities	34,232	26,030
Other Liabilities [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Fair value of derivative liabilities	762	0
Other Liabilities [Member] | Visa Derivative[Member]
Derivative [Line Items]
Fair value of derivative liabilities	$ 1,415	$ 1,415