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Derivative Financial Instruments - Derivatives not Designated as Hedging Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Asset Derivatives | IRLCs        
Derivatives not designated as hedging instruments $ 308 $ 284 $ 1,450 $ 386
Liability Derivatives | Forward contracts        
Derivatives not designated as hedging instruments $ 580 $ (588) $ (495) $ 57