Derivative Instruments (Impact Of Derivatives On Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Assets (Prepaid Issuance Costs) [Member]
Derivative [Line Items]
Fair Value of Derivative Assets	$ 27,139	$ 32,117
Other Liabilities [Member]
Derivative [Line Items]
Fair Value of Derivative Liabilities	27,445	33,552
Not Designated As Hedging Instruments [Member] | Other Assets (Prepaid Issuance Costs) [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Fair Value of Derivative Assets	25,580	30,904
Not Designated As Hedging Instruments [Member] | Other Assets (Prepaid Issuance Costs) [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Fair Value of Derivative Assets	1,559	1,213
Not Designated As Hedging Instruments [Member] | Other Assets (Prepaid Issuance Costs) [Member] | Other Contract [Member]
Derivative [Line Items]
Fair Value of Derivative Assets	0	0
Not Designated As Hedging Instruments [Member] | Other Liabilities [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Fair Value of Derivative Liabilities	26,030	31,398
Not Designated As Hedging Instruments [Member] | Other Liabilities [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Fair Value of Derivative Liabilities	0	753
Not Designated As Hedging Instruments [Member] | Other Liabilities [Member] | Other Contract [Member]
Derivative [Line Items]
Fair Value of Derivative Liabilities	$ 1,415	$ 1,401