Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional Amount of Derivatives	$ 1,340,347	$ 1,184,666
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,162,638	1,020,310
Interest Rate Caps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	64,543	66,118
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Notional Amount of Derivatives	64,085	62,456
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	5,278	15,535
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Notional Amount of Derivatives	20,160	8,605
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,643	642
Forward TBA Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	$ 22,000	$ 11,000