Fair Value Measurements - Reconciliation of Assets with Unobservable Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 12,829	$ 8,178
Change included in earnings	(4,544)	(1,171)
Purchases and issuances	19,789	22,284
Sales and settlements	(14,130)	(16,462)
Ending balance	13,944	12,829
Interest rate lock commitments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	978	873
Change included in earnings	(1,942)	(2,018)
Purchases and issuances	15,904	18,585
Sales and settlements	(14,130)	(16,462)
Ending balance	810	978
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	10,821	7,305
Change included in earnings	(2,608)	(125)
Purchases and issuances	3,707	3,641
Sales and settlements	0	0
Ending balance	11,920	10,821
Commercial servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,030	0
Change included in earnings	6	972
Purchases and issuances	178	58
Sales and settlements	0	0
Ending balance	$ 1,214	$ 1,030