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Warehouse Facilities Collateralized by U.S. Government Sponsored Enterprises (Details) - USD ($)
2 Months Ended 12 Months Ended
Feb. 01, 2021
Dec. 31, 2020
Dec. 31, 2019
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises   $ 1,061,202,000 $ 209,648,000
Outstanding draws   1,061,202,000 209,648,000
Committed Lines      
Securities Financing Transaction      
Lines available   1,750,000,000  
Uncommitted Lines      
Securities Financing Transaction      
Lines available   400,000,000  
Warehouse facility due October 8, 2021      
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises   358,247,000 34,125,000
Outstanding draws   $ 358,247,000 34,125,000
Warehouse facility due October 8, 2021 | LIBOR | Minimum      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   1.15%  
Warehouse facility due October 8, 2021 | LIBOR | Maximum      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   1.40%  
Warehouse facility due October 8, 2021 | Committed Lines      
Securities Financing Transaction      
Lines available   $ 900,000,000  
Warehouse facility due October 8, 2021 | Committed Lines | Subsequent Event      
Securities Financing Transaction      
Lines available $ 900,000,000.0    
Warehouse credit facility increase (decrease) $ 300,000,000.0    
Warehouse facility due June 16, 2021      
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises   292,040,000 16,759,000
Outstanding draws   $ 292,040,000 16,759,000
Warehouse facility due June 16, 2021 | LIBOR | Minimum      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   1.15%  
Warehouse facility due June 16, 2021 | LIBOR | Maximum      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   1.40%  
Warehouse facility due June 16, 2021 | Committed Lines      
Securities Financing Transaction      
Lines available   $ 450,000,000  
Warehouse facility due September 25, 2021      
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises   146,380,000 8,097,000
Outstanding draws   $ 146,380,000 8,097,000
Warehouse facility due September 25, 2021 | LIBOR | Minimum      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   1.15%  
Warehouse facility due September 25, 2021 | LIBOR | Maximum      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   1.40%  
Warehouse facility due September 25, 2021 | Committed Lines      
Securities Financing Transaction      
Lines available   $ 400,000,000  
Warehouse facility due June 16, 2021, sublimit | Committed Lines      
Securities Financing Transaction      
Lines available   $ 125,000,000.0  
Warehouse facility due June 16, 2021, sublimit | Committed Lines | LIBOR      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   2.00%  
Fannie Mae repurchase agreement, open maturity      
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises   $ 264,535,000 150,667,000
Outstanding draws   $ 264,535,000 $ 150,667,000
Fannie Mae repurchase agreement, open maturity | LIBOR | Minimum      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   1.05%  
Fannie Mae repurchase agreement, open maturity | LIBOR | Maximum      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   1.15%  
Fannie Mae repurchase agreement, open maturity | Uncommitted Lines      
Securities Financing Transaction      
Lines available   $ 400,000,000