Derivative Instruments (Change In Fair Value Of Derivative Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Not Designated as Hedging Instrument [Member] | Derivative Assets [Member] | Other Income [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	$ (485)	$ 11,346
Not Designated as Hedging Instrument [Member] | Derivative Assets [Member] | Other Expense [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	45	0
Not Designated as Hedging Instrument [Member] | Derivative Liabilities [Member] | Other Income [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	485	(11,630)
Designated as Hedging Instrument [Member] | Derivative Assets [Member] | Other Expense [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	(4)	0
Designated as Hedging Instrument [Member] | Derivative Liabilities [Member] | Other Expense [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	0	(2)
Loans Receivable [Member] | Designated as Hedging Instrument [Member] | Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Change in Fair Value	$ 14	$ 121