Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Other assets	$ 5,092	$ 8,349
Other liabilities	(16,373)	(8,074)
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	4,403	7,674
Other liabilities	(16,120)	(7,857)
Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	26	16
Other liabilities	(26)	(16)
Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	29	46
Other liabilities	(91)	(123)
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	51	21
Other liabilities	(61)	(40)
Mortgage Loan Commitments [Member]
Derivatives, Fair Value [Line Items]
Other assets	582	580
Other liabilities	0	0
Mortgage Loan Forward Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	1	8
Other liabilities	0	(7)
Forward TBA Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	0	4
Other liabilities	$ (75)	$ (31)