Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Other assets	$ 6,239	$ 8,349
Other liabilities	(19,846)	(8,074)
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	5,265	7,674
Other liabilities	(19,616)	(7,857)
Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	20	16
Other liabilities	(20)	(16)
Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	21	46
Other liabilities	(67)	(123)
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	194	21
Other liabilities	(31)	(40)
Mortgage Loan Commitments [Member]
Derivatives, Fair Value [Line Items]
Other assets	730	580
Other liabilities	0	0
Mortgage Loan Forward Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	8	8
Other liabilities	(1)	(7)
Forward TBA Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	1	4
Other liabilities	$ (111)	$ (31)