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Warehouse Facilities Collateralized by U.S. Government Sponsored Enterprises (Details) - USD ($)
2 Months Ended 9 Months Ended
Oct. 31, 2020
Oct. 27, 2020
Sep. 30, 2020
Dec. 31, 2019
Securities Financing Transaction        
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises     $ 1,510,333,000 $ 209,648,000
Outstanding draws     1,510,333,000 209,648,000
Committed Lines        
Securities Financing Transaction        
Lines available     2,350,000,000  
Committed Lines | Subsequent Event        
Securities Financing Transaction        
Warehouse credit facility increase (decrease) $ 500,000,000.0 $ 600,000,000.0    
Uncommitted Lines        
Securities Financing Transaction        
Lines available     400,000,000  
Warehouse facility due October 9, 2020        
Securities Financing Transaction        
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises     993,200,000 34,125,000
Outstanding draws     $ 993,200,000 34,125,000
Warehouse facility due October 9, 2020 | LIBOR | Minimum        
Securities Financing Transaction        
Basis spread on variable rate (in percentage)     1.15%  
Warehouse facility due October 9, 2020 | LIBOR | Maximum        
Securities Financing Transaction        
Basis spread on variable rate (in percentage)     1.40%  
Warehouse facility due October 9, 2020 | Committed Lines        
Securities Financing Transaction        
Lines available     $ 1,500,000,000  
Warehouse facility due June 16, 2021        
Securities Financing Transaction        
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises     273,088,000 16,759,000
Outstanding draws     $ 273,088,000 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     164,590,000 8,097,000
Outstanding draws     $ 164,590,000 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 facilities collateralized by U.S. Government Sponsored Enterprises     0  
Outstanding draws     $ 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     $ 79,455,000 150,667,000
Outstanding draws     $ 79,455,000 $ 150,667,000
Fannie Mae repurchase agreement, open maturity | LIBOR        
Securities Financing Transaction        
Basis spread on variable rate (in percentage)     1.05%  
Fannie Mae repurchase agreement, open maturity | Uncommitted Lines        
Securities Financing Transaction        
Lines available     $ 400,000,000