Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net			$ 3,300
Other Income [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	5,543	(8,167)	7,356
Forward Contracts [Member] | Mortgage Banking Income [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	2,503	(11,190)	7,195
InterestRateSwapWithCustomer [Domain] | Other Income [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	4,346	2,744	0
InterestRateSwapWithCounterparty [Domain] | Other Income [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(4,346)	(2,744)	0
ForeignCurrencyForwardWithCorrespondentBanks [Domain] | Other Income [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	1,648	(2,133)	268
ForeignCurrencyForwardWithCustomer [Domain] | Other Income [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	(1,487)	1,295	(535)
Interest Rate Lock Commitments [Member] | Mortgage Banking Income [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	$ 2,879	$ 3,861	$ 428