Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Mortgage Banking Income [Member] | Interest rate lock with customers [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	$ 1,203	$ (5,886)	$ 1,592	$ (8,424)
Mortgage Banking Income [Member] | Forward Commitments [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(1,503)	9,847	(3,001)	10,275
Other Income [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(293)	4,212	(1,478)	2,980
Other Income [Member] | InterestRateSwapWithCustomer [Domain]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	6,135	(5,871)	10,340	(6,279)
Other Income [Member] | Interest Rate Swap [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(6,135)	5,871	(10,340)	6,279
Other Income [Member] | ForeignCurrencyForwardWithCustomer [Domain]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	105	(291)	297	169
Other Income [Member] | ForeignCurrencyForwardWithCustomer [Domain]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$ (98)	$ 542	$ (366)	$ 960