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Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Derivative [Line Items]    
Foreign Currency Open Position $ 500,000  
Derivative asset, fair value 38,137 $ 20,360
Derivative liability, fair value 37,857 20,790
Derivative asset (liability), net 1,030 160
Interest Rate Lock Commitments [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 121,546 89,655
Derivative liability, notional amount 172 301
Derivative asset, fair value 2,263 1,391
Derivative liability, fair value 2 6
Derivative asset (liability), net 2,261 1,385
Forward Commitments [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 110 0
Derivative liability, notional amount 117,389 93,802
Derivative asset, fair value 0 0
Derivative liability, fair value 1,502 1,164
Derivative asset (liability), net (1,502) (1,164)
Interest Rate Swap with Customer [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 681,647 468,080
Derivative liability, notional amount 8,000 25,418
Derivative asset, fair value 37,436 19,716
Derivative liability, fair value 87 198
Derivative asset (liability), net 37,349 19,518
Interest Rate Swap with Counterparty [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 8,000 25,418
Derivative liability, notional amount 681,647 468,080
Derivative asset, fair value 87 198
Derivative liability, fair value 37,436 19,716
Derivative asset (liability), net (37,349) (19,518)
Foreign Exchange Contracts With Customer [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 7,183 11,616
Derivative liability, notional amount 7,091 5,250
Derivative asset, fair value 260 810
Derivative liability, fair value 269 441
Derivative asset (liability), net (9) 369
Foreign Exchange Contracts With Correspondent Banks [Member]    
Derivative [Line Items]    
Derivative asset, notional amount 10,308 5,287
Derivative liability, notional amount 8,630 13,572
Derivative asset, fair value 614 446
Derivative liability, fair value 334 876
Derivative asset (liability), net $ 280 $ (430)