Derivative And Hedging Activities (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Interest rate-related agreements (1), fair value	$ 67,891		$ 71,143
Other assets [Member] | Interest rate-related instruments - customer and mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	1,655,325		1,563,831
Interest rate-related agreements (1), fair value	67,891		71,143
Receive Rate	1.54%	[1]	1.66%	[1]
Pay Rate	1.54%	[1]	1.66%	[1]
Maturity	43		45
Other assets [Member] | Interest rate lock commitments (mortgage) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	366,507		235,375
Interest rate-related agreements (1), fair value	6,755		4,571
Other assets [Member] | Foreign currency exchange forwards [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	44,363		52,973
Interest rate-related agreements (1), fair value	1,133		2,079
Other assets [Member] | Purchased option [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	82,116		54,780
Interest rate-related agreements (1), fair value	4,078		2,854
Other liabilities [Member] | Interest rate-related instruments - customer and mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	1,655,325		1,563,831
Interest rate-related agreements (1), fair value	(74,057)		(78,064)
Receive Rate	1.54%	[1]	1.66%	[1]
Pay Rate	1.54%	[1]	1.66%	[1]
Maturity	43		45
Other liabilities [Member] | Forward commitments (mortgage) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	461,250		437,500
Interest rate-related agreements (1), fair value	(887)		(4,771)
Other liabilities [Member] | Foreign currency exchange forwards [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	44,722		44,107
Interest rate-related agreements (1), fair value	(1,066)		(1,891)
Other liabilities [Member] | Purchased option [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	82,116		54,780
Interest rate-related agreements (1), fair value	$ (4,078)		$ (2,854)

[1] (1)Reflects the weighted average receive rate and pay rate for the interest rate swap derivative financial instruments only.