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Warehouse Facilities Collateralized by U.S. Government Sponsored Enterprises (Details) - USD ($)
2 Months Ended 6 Months Ended
Aug. 29, 2020
Jul. 16, 2020
Jun. 30, 2020
Dec. 31, 2019
Securities Financing Transaction        
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises     $ 1,064,096,000 $ 209,648,000
Outstanding draws     1,064,096,000 209,648,000
Committed Lines        
Securities Financing Transaction        
Lines available     1,650,000,000  
Committed Lines | Forecast        
Securities Financing Transaction        
Warehouse credit facility increase (decrease) $ 400,000,000      
Committed Lines | Subsequent Event        
Securities Financing Transaction        
Warehouse credit facility increase (decrease)   $ 200,000,000    
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     850,685,000 34,125,000
Outstanding draws     $ 850,685,000 34,125,000
Warehouse facility due October 9, 2020 | LIBOR        
Securities Financing Transaction        
Basis spread on variable rate (in percentage)     1.15%  
Warehouse facility due October 9, 2020 | Committed Lines        
Securities Financing Transaction        
Lines available     $ 1,000,000,000  
Warehouse facility due June 16, 2021        
Securities Financing Transaction        
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises     94,249,000 16,759,000
Outstanding draws     $ 94,249,000 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)     1.50%  
Warehouse facility due June 16, 2021 | Committed Lines        
Securities Financing Transaction        
Lines available     $ 450,000,000  
Warehouse facility due June 16, 2021, sublimit | Committed Lines        
Securities Financing Transaction        
Lines available     125,000,000  
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%  
Warehouse facility due September 25, 2020        
Securities Financing Transaction        
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises     $ 48,587,000 8,097,000
Outstanding draws     $ 48,587,000 8,097,000
Warehouse facility due September 25, 2020 | LIBOR        
Securities Financing Transaction        
Basis spread on variable rate (in percentage)     1.15%  
Warehouse facility due September 25, 2020 | Committed Lines        
Securities Financing Transaction        
Lines available     $ 200,000,000  
Fannie Mae repurchase agreement, open maturity        
Securities Financing Transaction        
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises     70,575,000 150,667,000
Outstanding draws     $ 70,575,000 $ 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