Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Foreign Currency Open Position	$ 500,000
Derivative, Fair Value, Net	5,461	738
Interest Rate Lock Commitments [Member]
Asset (Liability) Fair Value	12,863	3,878
Interest Rate Lock Commitments [Member] \| Positive Fair Values [Member]
Notional Amount	390,800	181,583
Asset, Fair Value	12,949	3,888
Interest Rate Lock Commitments [Member] \| Negative Fair Values [Member]
Notional Amount	5,055	1,593
Liability, Fair Value	(86)	(10)
Forward Commitments [Member]
Asset (Liability) Fair Value	(7,779)	(2,711)
Forward Commitments [Member] \| Positive Fair Values [Member]
Notional Amount	11,157	3,178
Asset, Fair Value	157	13
Forward Commitments [Member] \| Negative Fair Values [Member]
Notional Amount	372,142	173,208
Liability, Fair Value	(7,936)	(2,724)
InterestRateSwapWithCustomer [Domain] \| Positive Fair Values [Member]
Notional Amount	106,084	33,846
Asset, Fair Value	6,973	2,744
InterestRateSwapWithCounterparty [Domain] \| Negative Fair Values [Member]
Notional Amount	106,084	33,846
Liability, Fair Value	(6,973)	(2,744)
ForeignCurrencyForwardWithCustomer [Domain]
Foreign Currency Derivatives at Fair Value, Net	(441)	1,276
ForeignCurrencyForwardWithCustomer [Domain] \| Positive Fair Values [Member]
Notional Amount of Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	21,586	45,143
Foreign Currency Contract, Asset, Fair Value Disclosure	330	1,413
ForeignCurrencyForwardWithCustomer [Domain] \| Negative Fair Values [Member]
Notional Amount of Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	36,278	13,984
Foreign Currency Contracts, Liability, Fair Value Disclosure	(771)	(137)
ForeignCurrencyForwardWithCorrespondentBanks [Domain]
Foreign Currency Derivatives at Fair Value, Net	818	(1,705)
ForeignCurrencyForwardWithCorrespondentBanks [Domain] \| Positive Fair Values [Member]
Notional Amount of Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	57,255	37,678
Foreign Currency Contract, Asset, Fair Value Disclosure	1,306	749
ForeignCurrencyForwardWithCorrespondentBanks [Domain] \| Negative Fair Values [Member]
Notional Amount of Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	30,651	68,081
Foreign Currency Contracts, Liability, Fair Value Disclosure	$ (488)	$ (2,454)

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Fair value as of the balance sheet date of the assets less the liabilities of a derivative or group of derivatives.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents contracts related to the exchange of different currencies, including foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into and existing as of the balance sheet date.

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Fair value as of the balance sheet date of foreign currency derivative assets, net of foreign currency derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

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Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

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Aggregate notional amount of all foreign currency derivatives not designated as hedging instruments. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

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