Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	$ 486,207	$ 498,071
Interest Rate Caps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	29,736	31,736
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Notional Amount of Derivatives	41,414	40,661
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	80,535	25,867
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,280	12,125
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	3,650	24,112
Total Notional Amount [Member]
Derivative [Line Items]
Notional Amount of Derivatives	$ 642,822	$ 632,572