Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Notional Amount of Derivatives	$ 558,880	$ 554,418
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	424,750	435,542
Interest Rate Caps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	11,236	27,736
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Notional Amount of Derivatives	42,297	43,243
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	$ 80,597	$ 47,897