Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Other assets	$ 13,566	$ 12,771
Other liabilities	(13,339)	(12,729)
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	12,987	11,993
Other liabilities	(12,987)	(11,993)
Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	78	73
Other liabilities	(78)	(73)
Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	65	1
Other liabilities	(156)	(195)
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	66	437
Other liabilities	(4)	(430)
Mortgage Loan Commitments [Member]
Derivatives, Fair Value [Line Items]
Other assets	355	263
Other liabilities	(6)	0
Mortgage Loan Forward Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	0	0
Other liabilities	(63)	0
Forward TBA Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	15	4
Other liabilities	$ (45)	$ (38)