Derivative And Hedging Activities (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013		Dec. 31, 2012
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Fair Value	$ 63,453		$ 69,370
Other Assets [Member] | Interest Rate Related Instruments Customer and Mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	1,749,892		1,728,545
Fair Value	63,453		69,370
Receive Rate	1.26%	[1]	1.30%	[1]
Pay Rate	1.26%	[1]	1.30%	[1]
Maturity	3 years 10 months		3 years 11 months
Other Assets [Member] | Interest Rate Lock Commitments [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	432,426		351,786
Fair Value	5,268		7,794
Other Assets [Member] | Foreign Currency Exchange Forward [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	48,456		39,763
Fair Value	1,561		1,341
Other Assets [Member] | Purchased deposit option [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	112,065		111,262
Fair Value	5,637		3,620
Other Liabilities [Member] | Interest Rate Related Instruments Customer and Mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	1,749,892		1,728,545
Fair Value	(68,833)		(75,131)
Receive Rate	1.26%	[1]	1.30%	[1]
Pay Rate	1.26%	[1]	1.30%	[1]
Maturity	3 years 10 months		3 years 11 months
Other Liabilities [Member] | Forward Commitments [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	438,500		520,000
Fair Value	(843)		(147)
Other Liabilities [Member] | Foreign Currency Exchange Forward [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	43,167		35,745
Fair Value	(1,403)		(1,212)
Other Liabilities [Member] | Written deposit option [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	112,065		111,262
Fair Value	$ (5,637)		$ (3,620)

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