Derivative Instruments (Change In Fair Value Of Derivative Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Not Designated as Hedging Instrument [Member] | Derivative Assets [Member] | Other Income [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	$ (932)	$ (6,744)	$ (1,418)	$ (18,090)
Not Designated as Hedging Instrument [Member] | Derivative Assets [Member] | Other Expense [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	(22)	0	24	0
Not Designated as Hedging Instrument [Member] | Derivative Liabilities [Member] | Other Income [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	932	6,869	1,418	18,498
Designated as Hedging Instrument [Member] | Derivative Assets [Member] | Other Income [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	5	0	9	0
Designated as Hedging Instrument [Member] | Derivative Liabilities [Member] | Other Income [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	0	6	0	4
Loans Receivable [Member] | Designated as Hedging Instrument [Member] | Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	$ (17)	$ 43	$ 3	$ 164