Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Mortgage Banking Income [Member] | Interest rate lock with customers [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	$ 389	$ (2,538)
Mortgage Banking Income [Member] | Forward Commitments [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(1,498)	428
Other Income [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(1,185)	(1,232)
Other Income [Member] | InterestRateSwapWithCustomer [Domain]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	4,205	(408)
Other Income [Member] | Interest Rate Swap [Member]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(4,205)	408
Other Income [Member] | ForeignCurrencyForwardWithCustomer [Domain]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	192	460
Other Income [Member] | ForeignCurrencyForwardWithCustomer [Domain]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$ (268)	$ 418