Fair Value of Assets and Liabilities - Reconciliation of Assets with Unobservable Inputs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 4,092	$ 2,943	$ 3,168	$ 1,851
Change included in earnings	(855)	(613)	(1,415)	(1,200)
Purchases and issuances	6,640	5,705	11,748	10,891
Sales and settlements	(4,695)	(5,606)	(8,319)	(9,113)
Ending balance	5,182	2,429	5,182	2,429
Net change in unrealized gains (losses) relating to items held at end of period	2,580	1,487	2,580	1,487
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,234	971	1,654	1,010
Change included in earnings	(245)	(29)	(357)	(68)
Purchases and issuances	613	0	1,305	0
Sales and settlements	0	0	0	0
Ending balance	2,602	942	2,602	942
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	1,858	1,972	1,514	841
Change included in earnings	(610)	(584)	(1,058)	(1,132)
Purchases and issuances	6,027	5,705	10,443	10,891
Sales and settlements	(4,695)	(5,606)	(8,319)	(9,113)
Ending balance	2,580	1,487	2,580	1,487
Net change in unrealized gains (losses) relating to items held at end of period	$ 2,580	$ 1,487	$ 2,580	$ 1,487