Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Other assets	$ 13,203	$ 8,349
Derivative Liabilities	23,012	8,074
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets	7,829	0
Derivative Liabilities	0	0
Designated as Hedging Instrument [Member] | Interest Rate Floor [Member]
Derivatives, Fair Value [Line Items]
Other assets	7,829	0
Derivative Liabilities	0	0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets	5,374	8,349
Derivative Liabilities	23,012	8,074
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	4,476	7,674
Derivative Liabilities	22,916	7,857
Not Designated as Hedging Instrument [Member] | Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	18	16
Derivative Liabilities	18	16
Not Designated as Hedging Instrument [Member] | Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	24	46
Derivative Liabilities	58	123
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	57	21
Derivative Liabilities	14	40
Not Designated as Hedging Instrument [Member] | Mortgage Loan Commitments [Member]
Derivatives, Fair Value [Line Items]
Other assets	679	580
Derivative Liabilities	0	0
Not Designated as Hedging Instrument [Member] | Mortgage Loan Forward Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	9	8
Derivative Liabilities	2	7
Not Designated as Hedging Instrument [Member] | Forward TBA Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	111	4
Derivative Liabilities	$ 4	$ 31