Derivative Instruments And Hedging Activities (Schedule Of Notional Amounts And Recorded Gross Fair Values And Related Gain (Loss) Of Derivative Instruments) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Derivative [Line Items]
Other Comprehensvie Income Loss Reclassification Adjustment From AOCI on Derivative Instruments, Gross	$ 400,000		$ 1,600,000
Total derivatives, Notional amount	4,705,155,000				4,979,378,000
Amount of derivative gain (loss), recognized in OCI	538,000		(4,000)
Amount of derivative gain (loss), Reclassified from AOCI to interest income	351,000	[1]	1,605,000	[1]
Derivatives instruments, Noninterest income (expense)	(6,259,000)		(1,412,000)
Derivatives designated as hedging instruments, Offset to interest expense	718,000		766,000
Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives instruments, Noninterest income (expense)	0	[2]	0	[2]
Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	57,683,000				65,683,000
Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	62,589,000				68,397,000
Derivatives Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount	150,000,000				100,000,000
Amount of derivative gain (loss), recognized in OCI	538,000		(4,000)
Amount of derivative gain (loss), Reclassified from AOCI to interest income	351,000	[1]	1,605,000	[1]
Derivatives instruments, Noninterest income (expense)	0		0
Derivatives designated as hedging instruments, Offset to interest expense	718,000		766,000
Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Amount of derivative gain (loss), recognized in OCI	538,000	[2]	(4,000)	[2]
Amount of derivative gain (loss), Reclassified from AOCI to interest income	351,000	[1],[2]	1,605,000	[1],[2]
Derivatives Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	298,000				202,000
Derivatives Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	492,000				583,000
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Total derivatives, Notional amount	150,000,000	[2]			100,000,000	[2]
Amount of derivative gain (loss), recognized in OCI	538,000	[2]	(4,000)	[2]
Amount of derivative gain (loss), Reclassified from AOCI to interest income	351,000	[1],[2]	1,605,000	[1],[2]
Derivatives instruments, Noninterest income (expense)	0	[2]	0	[2]
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	298,000	[2]			202,000	[2]
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	492,000	[2]			583,000	[2]
Derivatives Designated As Hedging Instruments [Member] | Terminated Swaps On Long-Term Debt [Member] | Fair Value Hedges [Member]
Derivative [Line Items]
Derivatives designated as hedging instruments, Offset to interest expense	718,000		766,000
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount	4,555,155,000				4,879,378,000
Derivatives instruments, Noninterest income (expense)	(6,259,000)		(1,412,000)
Derivatives Not Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	57,385,000				65,481,000
Derivatives Not Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	62,097,000				67,814,000
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member]
Derivative [Line Items]
Total derivatives, Notional amount	434,058,000				751,066,000
Derivatives instruments, Noninterest income (expense)	1,711,000		2,754,000
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	6,409,000				9,614,000
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	5,412,000				8,643,000
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Total derivatives, Notional amount	60,967,000				65,850,000
Derivatives instruments, Noninterest income (expense)	6,000		(67,000)
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	332,000				420,000
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	286,000				421,000
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member]
Derivative [Line Items]
Total derivatives, Notional amount	2,900,444,000	[3]			2,902,776,000	[3]
Derivatives instruments, Noninterest income (expense)	(549,000)	[3]	1,458,000	[3]
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	50,644,000	[3]			55,447,000	[3]
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	51,000,000	[3]			54,688,000	[3]
Derivatives Not Designated As Hedging Instruments [Member] | Futures Contracts [Member]
Derivative [Line Items]
Derivatives instruments, Noninterest income (expense)	0		1,000
Derivatives Not Designated As Hedging Instruments [Member] | Total Return Swap [Member]
Derivative [Line Items]
Total derivatives, Notional amount	1,159,686,000				1,159,686,000
Derivatives instruments, Noninterest income (expense)	(7,427,000)		(5,558,000)
Derivatives Not Designated As Hedging Instruments [Member] | Total Return Swap [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets	0				0
Derivatives Not Designated As Hedging Instruments [Member] | Total Return Swap [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	$ 5,399,000				$ 4,062,000

[1] Amounts for the three months ended March 31 2014 and 2013 of $0.4 million and $1.6 million, respectively, are the amounts of reclassification to earnings from AOCI presented in Note 8.

[2] Amounts recognized in OCI and reclassified from accumulated OCI (“AOCI”) represent the effective portion of the derivative gain (loss).

[3] Amounts include both the customer swaps and the offsetting derivative contracts.