Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Mortgage Banking Income [Member] | Interest rate lock with customers [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	$ 4,717	$ 3,933	$ (3,707)	$ 8,985
Mortgage Banking Income [Member] | Forward Commitments [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(12,244)	(3,255)	(1,969)	(5,068)
Other Income [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(7,921)	1,001	(4,941)	4,723
Other Income [Member] | InterestRateSwapWithCustomer [Domain]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	1,009	1,189	(5,270)	4,229
Other Income [Member] | Interest Rate Swap [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(1,009)	(1,189)	5,270	(4,229)
Other Income [Member] | ForeignCurrencyForwardWithCustomer [Domain]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	(344)	1,654	(175)	2,523
Other Income [Member] | ForeignCurrencyForwardWithCustomer [Domain]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$ (50)	$ (1,331)	$ 910	$ (1,717)