Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Other assets	$ 11,650	$ 13,566
Other liabilities	(5,979)	(13,339)
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	10,630	12,987
Other liabilities	(5,775)	(12,987)
Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	29	78
Other liabilities	(29)	(78)
Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	56	65
Other liabilities	(129)	(156)
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	68	66
Other liabilities	(30)	(4)
Mortgage Loan Commitments [Member]
Derivatives, Fair Value [Line Items]
Other assets	757	355
Other liabilities	0	(6)
Mortgage Loan Forward Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	8	0
Other liabilities	0	(63)
Forward TBA Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	102	15
Other liabilities	$ (16)	$ (45)