Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Foreign Currency Contract, Fair Value, Net	$ 160	$ 2,197
Interest Rate Locks with Customers
Derivatives, Fair Value [Line Items]
Derivatives, at Fair Value, Net	1,385	808
Interest Rate Locks with Customers \| Positive fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	89,655	75,217
Derivative Assets, at Fair Value	1,391	867
Interest Rate Locks with Customers \| Negative fair values
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	301	11,393
Derivative Liabilities, at Fair Value	(6)	(59)
Forward Commitments
Derivatives, Fair Value [Line Items]
Derivatives, at Fair Value, Net	(1,164)	1,258
Forward Commitments \| Positive fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	0	87,904
Derivative Assets, at Fair Value	0	1,263
Forward Commitments \| Negative fair values
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	93,802	2,373
Derivative Liabilities, at Fair Value	(1,164)	(5)
Interest Rate Swaps with Customers
Derivatives, Fair Value [Line Items]
Derivatives, at Fair Value, Net	19,518	(888)
Interest Rate Swaps with Customers \| Positive fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	468,080	111,899
Derivative Assets, at Fair Value	19,716	2,105
Interest Rate Swaps with Customers \| Negative fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	25,418	105,673
Derivative Liabilities, at Fair Value	(198)	(2,993)
Interest Rate Swaps with Dealer Counterparties
Derivatives, Fair Value [Line Items]
Derivatives, at Fair Value, Net	(19,518)	888
Interest Rate Swaps with Dealer Counterparties \| Positive fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	25,418	105,673
Derivative Assets, at Fair Value	198	2,993
Interest Rate Swaps with Dealer Counterparties \| Negative fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	468,080	111,899
Derivative Liabilities, at Fair Value	(19,716)	(2,105)
Foreign Exchange Contracts with Customers
Derivatives, Fair Value [Line Items]
Foreign Currency Contract, Fair Value, Net	369	(319)
Foreign Exchange Contracts with Customers \| Positive fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	11,616	2,150
Foreign Currency Contract, Asset, Fair Value	810	24
Foreign Exchange Contracts with Customers \| Negative fair values
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	5,250	12,775
Foreign Currency Contracts, Liability, Fair Value	(441)	(343)
Foreign Exchange Contracts with Correspondent Banks
Derivatives, Fair Value [Line Items]
Foreign Currency Contract, Fair Value, Net	(430)	450
Foreign Exchange Contracts with Correspondent Banks \| Positive fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	5,287	17,348
Foreign Currency Contract, Asset, Fair Value	446	498
Foreign Exchange Contracts with Correspondent Banks \| Negative fair values
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	13,572	5,872
Foreign Currency Contracts, Liability, Fair Value	$ (876)	$ (48)

Nominal or face amount used to calculate payments on the derivative asset.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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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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