Derivatives - Schedule of Derivative Gain (Loss) (Details) - Not Designated as Hedging Instrument - Mortgage banking income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives not designated as hedging	$ (143)	$ (177)	$ 714	$ (118)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives not designated as hedging	138	(370)	511	(482)
Interest rate lock commitments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives not designated as hedging	$ (281)	$ 193	$ 203	$ 364