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Derivative Financial Instruments - Derivatives not Designated as Hedging Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Asset Derivatives | IRLCs        
Derivatives not designated as hedging instruments $ 441 $ (290) $ 1,142 $ 102
Liability Derivatives | Forward contracts        
Derivatives not designated as hedging instruments (674) 0 (1,075) 0
Liability Derivatives | IRLCs        
Derivatives not designated as hedging instruments $ 0 $ 642 $ 0 $ 645