Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional Amount of Derivatives	$ 1,498,856	$ 1,184,666
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,320,674	1,020,310
Interest Rate Caps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	60,954	66,118
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Notional Amount of Derivatives	63,117	62,456
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	3,792	15,535
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Notional Amount of Derivatives	24,301	8,605
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	518	642
Forward TBA Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	$ 25,500	$ 11,000