Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Notional Amount of Derivatives	$ 606,026	$ 642,822
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	474,706	486,207
Interest Rate Caps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	28,736	29,736
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Notional Amount of Derivatives	40,642	41,414
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	61,942	80,535
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Notional Amount of Derivatives	0	1,280
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	$ 0	$ 3,650