Mortgage Servicing Rights - Schedule of Servicing Income and Expense Included in Mortgage Banking Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Servicing income:
Servicing income	$ 2,748	$ 1,996
Change in fair value of mortgage servicing rights	(501)
Gross servicing income	2,247	1,996
Servicing expenses:
Servicing asset amortization		1,457
Servicing asset impairment		773
Other servicing expenses	926	408
Gross servicing expenses	926	2,638
Net servicing (loss) income	$ 1,321	$ (642)