Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Income
Derivatives, Fair Value [Line Items]
Net fair value (losses) gains on derivative financial instruments	$ (2,037)	$ (4,084)	$ 5,543
Interest rate locks with customers \| Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gain (loss) on interest rate derivative instruments	577	(5,949)	2,879
Forward Commitments \| Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gain (loss) on interest rate derivative instruments	(2,422)	1,466	2,503
Interest Rate Swaps with Customers \| Other Income
Derivatives, Fair Value [Line Items]
Gain (loss) on interest rate derivative instruments	20,406	(7,978)	4,346
Interest Rate Swaps with Dealer Counterparties \| Other Income
Derivatives, Fair Value [Line Items]
Gain (loss) on interest rate derivative instruments	(20,406)	7,978	(4,346)
Foreign Exchange Contracts with Correspondent Banks \| Other Income
Derivatives, Fair Value [Line Items]
Gain (loss) on foreign currency derivatives	(880)	507	1,648
Foreign exchange contracts with customers \| Other Income
Derivatives, Fair Value [Line Items]
Gain (loss) on foreign currency derivatives	$ 688	$ (108)	$ (1,487)

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments.

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