Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Other assets	$ 106,430	$ 41,210
Derivative Liabilities	(10,012)	(13,421)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets	68,116	29,031
Derivative Liabilities	0	0
Designated as Hedging Instrument [Member] | Interest Rate Floor [Member]
Derivatives, Fair Value [Line Items]
Other assets	68,116	29,031
Derivative Liabilities	0	0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets	38,314	12,179
Derivative Liabilities	(10,012)	(13,421)
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	37,166	11,537
Derivative Liabilities	(9,646)	(13,110)
Not Designated as Hedging Instrument [Member] | Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	5	24
Derivative Liabilities	(5)	(24)
Not Designated as Hedging Instrument [Member] | Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	125	47
Derivative Liabilities	(177)	(93)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	23	20
Derivative Liabilities	(13)	(8)
Not Designated as Hedging Instrument [Member] | Mortgage Loan Commitments [Member]
Derivatives, Fair Value [Line Items]
Other assets	984	536
Derivative Liabilities	(49)	0
Not Designated as Hedging Instrument [Member] | Mortgage Loan Forward Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	10	15
Derivative Liabilities	0	(8)
Not Designated as Hedging Instrument [Member] | Forward TBA Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	1	0
Derivative Liabilities	$ (122)	$ (178)