Fair Value Measurements - Reconciliation of Assets with Unobservable Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,851	$ 0
Change included in earnings	(2,428)	(279)
Purchases and issuances	21,688	3,569
Sales and settlements	(17,943)	(1,439)
Ending balance	3,168	1,851
Net change in unrealized gains (losses) relating to items held at end of period	1,514	841
Interest rate lock commitments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	841	0
Change included in earnings	(2,270)	(119)
Purchases and issuances	20,886	2,399
Sales and settlements	(17,943)	(1,439)
Ending balance	1,514	841
Net change in unrealized gains (losses) relating to items held at end of period	1,514	841
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,010	0
Change included in earnings	(158)	(160)
Purchases and issuances	802	1,170
Sales and settlements	0	0
Ending balance	1,654	1,010
Net change in unrealized gains (losses) relating to items held at end of period	$ 0	$ 0