Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Mortgage Banking Income [Member] | Interest rate lock with customers [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	$ (2,538)	$ 809
Mortgage Banking Income [Member] | Forward Commitments [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	428	3,346
Other Income [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(1,232)	4,656
Other Income [Member] | InterestRateSwapWithCustomer [Domain]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(408)	525
Other Income [Member] | Interest Rate Swap [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	408	(525)
Other Income [Member] | ForeignCurrencyForwardWithCustomer [Domain]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	460	(1,050)
Other Income [Member] | ForeignCurrencyForwardWithCustomer [Domain]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$ 418	$ 1,551