Derivative And Hedging Activities Derivative Instruments Not Designated as Hedging Instruments (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013		Dec. 31, 2012
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Fair Value	$ 48,390		$ 69,370
Other Assets [Member] | Interest Rate Related Instruments Customer and Mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	1,827,810		1,728,545
Fair Value	48,390		69,370
Receive Rate	1.56%	[1]	1.30%	[1]
Pay Rate	1.56%	[1]	1.30%	[1]
Maturity	3 years 9 months		3 years 11 months
Other Assets [Member] | Interest Rate Lock Commitments [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	147,232		351,786
Fair Value	3,560		7,794
Other Assets [Member] | Foreign Currency Exchange Forward [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	40,064		39,763
Fair Value	1,012		1,341
Other Assets [Member] | Purchased deposit option [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	116,158		111,262
Fair Value	5,578		3,620
Other Liabilities [Member] | Interest Rate Related Instruments Customer and Mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	1,827,810		1,728,545
Fair Value	(51,551)		(75,131)
Receive Rate	1.56%	[1]	1.30%	[1]
Pay Rate	1.56%	[1]	1.30%	[1]
Maturity	3 years 9 months		3 years 11 months
Other Liabilities [Member] | Forward Commitments [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	243,050		520,000
Fair Value	(4,553)		(147)
Other Liabilities [Member] | Foreign Currency Exchange Forward [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	36,715		35,745
Fair Value	(879)		(1,212)
Other Liabilities [Member] | Written deposit option [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	116,158		111,262
Fair Value	$ (5,578)		$ (3,620)

[1] (1)Reflects the weighted average receive rate and pay rate for the interest rate-related instruments only.