Derivatives - Schedule of Derivative Instrument Gain (Loss) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Gain (loss) on derivative not designated as hedging	$ (649)	$ (897)
Interest rate contracts | Other Income
Derivative [Line Items]
Gain (loss) on derivative not designated as hedging	(420)	(530)
Interest rate lock commitments | Other Income
Derivative [Line Items]
Gain (loss) on derivative not designated as hedging	$ (229)	$ (367)