Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Foreign Currency Contract, Fair Value, Net	$ 1,667	$ 160
Interest Rate Locks with Customers
Derivatives, Fair Value [Line Items]
Derivatives, at Fair Value, Net	1,275	1,385
Interest Rate Locks with Customers | Positive fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	87,781	89,655
Derivative Assets, at Fair Value	1,291	1,391
Interest Rate Locks with Customers | Negative fair values
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	267	301
Derivative Liabilities, at Fair Value	(16)	(6)
Forward Commitments
Derivatives, Fair Value [Line Items]
Derivatives, at Fair Value, Net	181	(1,164)
Forward Commitments | Positive fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	69,045	0
Derivative Assets, at Fair Value	205	0
Forward Commitments | Negative fair values
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	16,193	93,802
Derivative Liabilities, at Fair Value	(24)	(1,164)
Interest Rate Swaps with Customers
Derivatives, Fair Value [Line Items]
Derivatives, at Fair Value, Net	32,860	19,518
Interest Rate Swaps with Customers | Positive fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	846,490	468,080
Derivative Assets, at Fair Value	32,915	19,716
Interest Rate Swaps with Customers | Negative fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	8,757	25,418
Derivative Liabilities, at Fair Value	(55)	(198)
Interest Rate Swaps with Dealer Counterparties
Derivatives, Fair Value [Line Items]
Derivatives, at Fair Value, Net	(32,860)	(19,518)
Interest Rate Swaps with Dealer Counterparties | Positive fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	8,757	25,418
Derivative Assets, at Fair Value	55	198
Interest Rate Swaps with Dealer Counterparties | Negative fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	846,490	468,080
Derivative Liabilities, at Fair Value	(32,915)	(19,716)
Foreign Exchange Contracts with Customers
Derivatives, Fair Value [Line Items]
Foreign Currency Contract, Fair Value, Net	(70)	369
Foreign Exchange Contracts with Customers | Positive fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	4,897	11,616
Foreign Currency Contract, Asset, Fair Value	114	810
Foreign Exchange Contracts with Customers | Negative fair values
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	8,050	5,250
Foreign Currency Contracts, Liability, Fair Value	(184)	(441)
Foreign Exchange Contracts with Correspondent Banks
Derivatives, Fair Value [Line Items]
Foreign Currency Contract, Fair Value, Net	281	(430)
Foreign Exchange Contracts with Correspondent Banks | Positive fair values
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	9,728	5,287
Foreign Currency Contract, Asset, Fair Value	428	446
Foreign Exchange Contracts with Correspondent Banks | Negative fair values
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	6,899	13,572
Foreign Currency Contracts, Liability, Fair Value	$ (147)	$ (876)