Fair Value of Assets and Liabilities - Reconciliation of Assets with Unobservable Inputs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 3,168	$ 1,851
Change included in earnings	76	1,676
Purchases and issuances	5,653	5,185
Sales and settlements	(4,805)	(5,769)
Ending balance	4,092	2,943
Net change in unrealized gains (losses) relating to items held at end of period	1,858	1,972
Interest rate lock commitments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,514	841
Change included in earnings	188	1,715
Purchases and issuances	4,961	5,185
Sales and settlements	(4,805)	(5,769)
Ending balance	1,858	1,972
Net change in unrealized gains (losses) relating to items held at end of period	1,858	1,972
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,654	1,010
Change included in earnings	(112)	(39)
Purchases and issuances	692	0
Sales and settlements	0	0
Ending balance	2,234	971
Net change in unrealized gains (losses) relating to items held at end of period	$ 0	$ 0