Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional Amount of Derivatives	$ 1,904,093	$ 1,184,666
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	1,685,099	1,020,310
Interest Rate Caps [Member]
Derivative [Line Items]
Notional Amount of Derivatives	59,379	66,118
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Notional Amount of Derivatives	121,514	62,456
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	4,046	15,535
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Notional Amount of Derivatives	12,429	8,605
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	6,626	642
Forward TBA Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	$ 15,000	$ 11,000