Fair Value of Assets and Liabilities - Reconciliation of Assets with Unobservable Inputs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 5,182	$ 2,429	$ 3,168	$ 1,851
Change included in earnings	(755)	(687)	(2,170)	(1,897)
Purchases and issuances	6,763	5,642	18,511	16,544
Sales and settlements	(6,230)	(4,398)	(14,549)	(13,512)
Ending balance	4,960	2,986	4,960	2,986
Net change in unrealized gains (losses) relating to items held at end of period	1,764	1,787	1,764	1,787
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,602	942	1,654	1,010
Change included in earnings	(166)	(27)	(523)	(105)
Purchases and issuances	760	284	2,065	294
Sales and settlements	0	0	0	0
Ending balance	3,196	1,199	3,196	1,199
Net change in unrealized gains (losses) relating to items held at end of period	0	0	0	0
Interest rate lock commitments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,580	1,487	1,514	841
Change included in earnings	(589)	(660)	(1,647)	(1,792)
Purchases and issuances	6,003	5,358	16,446	16,250
Sales and settlements	(6,230)	(4,398)	(14,549)	(13,512)
Ending balance	1,764	1,787	1,764	1,787
Net change in unrealized gains (losses) relating to items held at end of period	$ 1,764	$ 1,787	$ 1,764	$ 1,787