Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional Amount of Derivatives	$ 1,467,355	$ 1,184,666
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,293,615	1,020,310
Interest Rate Caps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	62,969	66,118
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Notional Amount of Derivatives	64,510	62,456
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	4,705	15,535
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Notional Amount of Derivatives	18,420	8,605
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	3,636	642
Forward TBA Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	$ 19,500	$ 11,000