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Warehouse Facilities Collateralized by U.S. Government Sponsored Enterprises (Details) - USD ($)
2 Months Ended 6 Months Ended
Feb. 01, 2021
Jun. 30, 2021
Dec. 31, 2020
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises   $ 410,170,000 $ 1,061,202,000
Outstanding draws   410,170,000 1,061,202,000
Committed Lines      
Securities Financing Transaction      
Lines available   1,450,000,000  
Uncommitted Lines      
Securities Financing Transaction      
Lines available   700,000,000  
Warehouse facility due October 8, 2021      
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises   233,349,000 358,247,000
Outstanding draws   $ 233,349,000 358,247,000
Warehouse facility due October 8, 2021 | LIBOR | Minimum      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   1.30%  
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 $ 600,000,000  
Warehouse credit facility increase (decrease) $ 300,000,000    
Warehouse facility due June 15, 2022      
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises   64,041,000 292,040,000
Outstanding draws   $ 64,041,000 292,040,000
Warehouse facility due June 15, 2022 | LIBOR      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   1.30%  
Warehouse facility due June 15, 2022 | LIBOR | Minimum      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   1.30%  
Warehouse facility due June 15, 2022 | LIBOR | Maximum      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   1.40%  
Warehouse facility due June 15, 2022 | Committed Lines      
Securities Financing Transaction      
Lines available   $ 450,000,000  
Warehouse facility due June 15, 2022 | Uncommitted Lines      
Securities Financing Transaction      
Lines available   300,000,000  
Warehouse facility due September 25, 2021      
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises   112,780,000 146,380,000
Outstanding draws   $ 112,780,000 146,380,000
Warehouse facility due September 25, 2021 | LIBOR | Minimum      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   1.30%  
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  
Fannie Mae repurchase agreement, open maturity      
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises   0 264,535,000
Outstanding draws   $ 0 $ 264,535,000
Fannie Mae repurchase agreement, open maturity | LIBOR      
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  
Warehouse facility due June 15, 2022, sublimit | Committed Lines      
Securities Financing Transaction      
Lines available   $ 125,000,000  
Warehouse facility due June 15, 2022, sublimit | Committed Lines | LIBOR | Minimum      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   1.80%  
Warehouse facility due June 15, 2022, sublimit | Committed Lines | LIBOR | Maximum      
Securities Financing Transaction      
Basis spread on variable rate (in percentage)   2.00%