Derivative Activities - Offsetting of Derivative Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Derivatives subject to master netting arrangements:
Gross amounts of recognized assets	$ 75,199	$ 167,870
Gross amounts offset in the consolidated balance sheet	(64,977)	(136,593)
Net amounts of assets presented in the consolidated balance sheet	10,222	31,277
Total
Gross amounts of recognized assets	398,672	847,831
Net amounts of assets presented in the balance sheet	333,695	711,238
Interest rate lock commitments
Derivatives not subject to master netting arrangements
Gross amounts of recognized assets	323,473	679,961
Total
Net amounts of assets presented in the balance sheet	323,473	679,961
MBS put options
Derivatives subject to master netting arrangements:
Gross amounts of recognized assets	7,655	14,302
Net amounts of assets presented in the consolidated balance sheet	7,655	14,302
Swaptions | Purchases
Derivatives subject to master netting arrangements:
Gross amounts of recognized assets	1,625	11,939
Net amounts of assets presented in the consolidated balance sheet	1,625	11,939
Forward contracts | Purchases
Derivatives subject to master netting arrangements:
Gross amounts of recognized assets	20,485	133,267
Net amounts of assets presented in the consolidated balance sheet	20,485	133,267
Forward contracts | Sales
Derivatives subject to master netting arrangements:
Gross amounts of recognized assets	40,215	1,451
Net amounts of assets presented in the consolidated balance sheet	40,215	1,451
Put options on Eurodollar futures | Purchases
Derivatives subject to master netting arrangements:
Gross amounts of recognized assets	3,141	5,520
Net amounts of assets presented in the consolidated balance sheet	3,141	5,520
Call options on Eurodollar futures | Purchases
Derivatives subject to master netting arrangements:
Gross amounts of recognized assets	2,078	1,391
Net amounts of assets presented in the consolidated balance sheet	$ 2,078	$ 1,391