Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Other assets	$ 41,210	$ 8,349
Other liabilities	(13,421)	(8,074)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets	29,031	0
Other liabilities	0	0
Designated as Hedging Instrument [Member] | Interest Rate Floor [Member]
Derivatives, Fair Value [Line Items]
Other assets	29,031	0
Other liabilities	0	0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets	12,179	8,349
Other liabilities	(13,421)	(8,074)
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	11,537	7,674
Other liabilities	(13,110)	(7,857)
Not Designated as Hedging Instrument [Member] | Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	24	16
Other liabilities	(24)	(16)
Not Designated as Hedging Instrument [Member] | Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	47	46
Other liabilities	(93)	(123)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	20	21
Other liabilities	(8)	(40)
Not Designated as Hedging Instrument [Member] | Mortgage Loan Commitments [Member]
Derivatives, Fair Value [Line Items]
Other assets	536	580
Other liabilities	0	0
Not Designated as Hedging Instrument [Member] | Mortgage Loan Forward Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	15	8
Other liabilities	(8)	(7)
Not Designated as Hedging Instrument [Member] | Forward TBA Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	0	4
Other liabilities	$ (178)	$ (31)