Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional Amount of Derivatives	$ 924,884	$ 797,030
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	751,656	647,709
Interest Rate Caps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	51,989	53,587
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Notional Amount of Derivatives	75,624	75,943
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	19,254	19,791
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Notional Amount of Derivatives	13,228	0
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,633	0
Forward TBA Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	$ 11,500	$ 0