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Derivative Financial Instruments - Offsetting of Derivative Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Derivatives subject to master netting arrangements:    
Gross amounts of recognized assets $ 526,831 $ 167,870
Gross amounts offset in the consolidated balance sheet (358,902) (136,593)
Net amounts of assets presented in the consolidated balance sheet 167,929 31,277
Total    
Gross amounts of recognized assets 889,754 847,831
Net amounts of assets presented in the balance sheet 530,852 711,238
Interest rate lock commitments    
Derivatives not subject to master netting arrangements    
Gross amounts of recognized assets 362,923 679,961
Total    
Net amounts of assets presented in the balance sheet 362,923 679,961
MBS put options    
Derivatives subject to master netting arrangements:    
Gross amounts of recognized assets 99,670 14,302
Net amounts of assets presented in the consolidated balance sheet 99,670 14,302
Total    
Gross amounts of recognized assets 99,670 14,302
Swaptions    
Derivatives subject to master netting arrangements:    
Gross amounts of recognized assets 50,973 11,939
Net amounts of assets presented in the consolidated balance sheet 50,973 11,939
Swaptions | Purchases    
Total    
Gross amounts of recognized assets 50,973 11,939
Forward contracts | Purchases    
Derivatives subject to master netting arrangements:    
Gross amounts of recognized assets 14,318 133,267
Net amounts of assets presented in the consolidated balance sheet 14,318 133,267
Total    
Gross amounts of recognized assets 14,318 133,267
Forward contracts | Sales    
Derivatives subject to master netting arrangements:    
Gross amounts of recognized assets 333,198 1,451
Net amounts of assets presented in the consolidated balance sheet 333,198 1,451
Total    
Gross amounts of recognized assets 333,198 1,451
Put options on interest rate futures | Purchases    
Derivatives subject to master netting arrangements:    
Gross amounts of recognized assets 27,133 5,520
Net amounts of assets presented in the consolidated balance sheet 27,133 5,520
Total    
Gross amounts of recognized assets 27,133 5,520
Call options on interest rate futures | Purchases    
Derivatives subject to master netting arrangements:    
Gross amounts of recognized assets 1,539 1,391
Net amounts of assets presented in the consolidated balance sheet 1,539 1,391
Total    
Gross amounts of recognized assets $ 1,539 $ 1,391