Fair Value Measurements - Reconciliation of Assets with Unobservable Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 13,944	$ 12,829
Change included in earnings	(11,305)	(4,544)
Purchases and issuances	64,205	19,789
Sales and settlements	(40,282)	(14,130)
Ending balance	26,562	13,944
Interest rate lock commitments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	810	978
Change included in earnings	(5,680)	(1,942)
Purchases and issuances	49,186	15,904
Sales and settlements	(40,282)	(14,130)
Ending balance	4,034	810
Investment securities held to maturity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0
Change included in earnings	0
Purchases and issuances	10,000
Sales and settlements	0
Ending balance	10,000	0
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	11,920	10,821
Change included in earnings	(5,526)	(2,608)
Purchases and issuances	4,824	3,707
Sales and settlements	0	0
Ending balance	11,218	11,920
Commercial servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,214	1,030
Change included in earnings	(99)	6
Purchases and issuances	195	178
Sales and settlements	0	0
Ending balance	$ 1,310	$ 1,214