Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional Amount of Derivatives	$ 1,062,402	$ 797,030
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	906,559	647,709
Interest Rate Caps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	41,603	53,587
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Notional Amount of Derivatives	70,736	75,943
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	17,751	19,791
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Notional Amount of Derivatives	12,473	0
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,280	0
Forward TBA Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	$ 12,000	$ 0