Mortgage Servicing Rights - Schedule of Servicing Income and Expense Included in Mortgage Banking Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Servicing income:
Servicing income	$ 2,747	$ 2,655	$ 5,495	$ 4,651
Change in fair value of mortgage servicing rights	(1,840)		(2,341)
Gross servicing income	907	2,655	3,154	4,651
Servicing expenses:
Servicing asset amortization		1,968		3,425
Servicing asset impairment		4,914		5,687
Loss on sale of mortgage servicing rights	249		249
Other servicing expenses	1,204	538	2,138	946
Gross servicing expenses	1,453	7,420	2,387	10,058
Net servicing (loss) income	$ (546)	$ (4,765)	$ 767	$ (5,407)