Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Foreign Currency Open Position	$ 500,000
Derivative asset, fair value	20,180	$ 20,360
Derivative liability, fair value	20,223	20,790
Derivative asset (liability), net	3,046	160
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	126,063	89,655
Derivative liability, notional amount	2,240	301
Derivative asset, fair value	1,268	1,391
Derivative liability, fair value	48	6
Derivative asset (liability), net	1,220	1,385
Forward Commitments [Member]
Derivative [Line Items]
Derivative asset, notional amount	111,387	0
Derivative liability, notional amount	27,107	93,802
Derivative asset, fair value	1,705	0
Derivative liability, fair value	24	1,164
Derivative asset (liability), net	1,681	(1,164)
Interest Rate Swap with Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	558,750	468,080
Derivative liability, notional amount	46,937	25,418
Derivative asset, fair value	19,317	19,716
Derivative liability, fair value	234	198
Derivative asset (liability), net	19,083	19,518
Interest Rate Swap with Counterparty [Member]
Derivative [Line Items]
Derivative asset, notional amount	46,937	25,418
Derivative liability, notional amount	558,750	468,080
Derivative asset, fair value	234	198
Derivative liability, fair value	19,317	19,716
Derivative asset (liability), net	(19,083)	(19,518)
Foreign Exchange Contracts With Customer [Member]
Derivative [Line Items]
Derivative asset, notional amount	8,200	11,616
Derivative liability, notional amount	7,128	5,250
Derivative asset, fair value	572	810
Derivative liability, fair value	384	441
Derivative asset (liability), net	188	369
Foreign Exchange Contracts With Correspondent Banks [Member]
Derivative [Line Items]
Derivative asset, notional amount	9,296	5,287
Derivative liability, notional amount	9,824	13,572
Derivative asset, fair value	629	446
Derivative liability, fair value	672	876
Derivative asset (liability), net	$ (43)	$ (430)