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Warehouse Facilities Collateralized by U.S. Government Sponsored Enterprises (Details) - USD ($)
9 Months Ended
Sep. 30, 2022
Oct. 07, 2022
Dec. 31, 2021
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises $ 1,016,352,000   $ 1,050,693,000
Outstanding draws 1,016,352,000   1,050,693,000
Committed Lines      
Securities Financing Transaction      
Lines available 1,350,000,000    
Uncommitted Lines      
Securities Financing Transaction      
Lines available 800,000,000    
Warehouse facility due June 14, 2023 Number 1      
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises 189,620,000   243,659,000
Outstanding draws $ 189,620,000   243,659,000
Warehouse facility due June 14, 2023 Number 1 | LIBOR      
Securities Financing Transaction      
Basis spread on variable rate 1.35%    
Warehouse facility due June 14, 2023 Number 1 | Committed Lines      
Securities Financing Transaction      
Lines available $ 450,000,000    
Warehouse facility due June 14, 2023 Number 2      
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises     135,601,000
Outstanding draws     135,601,000
Warehouse facility due June 14, 2023 Number 2 | LIBOR      
Securities Financing Transaction      
Basis spread on variable rate 1.35%    
Warehouse facility due June 14, 2023 Number 2 | Uncommitted Lines      
Securities Financing Transaction      
Lines available $ 300,000,000    
Warehouse facility due September 25, 2023 Number 1      
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises 109,223,000    
Outstanding draws $ 109,223,000    
Warehouse facility due September 25, 2023 Number 1 | LIBOR      
Securities Financing Transaction      
Basis spread on variable rate 1.30%    
Warehouse facility due September 25, 2023 Number 1 | Committed Lines      
Securities Financing Transaction      
Lines available $ 300,000,000    
Warehouse facility due September 25, 2023 Number 2      
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises     193,091,000
Outstanding draws     193,091,000
Warehouse facility due September 25, 2023 Number 2 | LIBOR      
Securities Financing Transaction      
Basis spread on variable rate 1.30%    
Warehouse facility due September 25, 2023 Number 2 | Uncommitted Lines      
Securities Financing Transaction      
Lines available $ 100,000,000    
Warehouse facility due October 7, 2022      
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises 577,600,000   384,571,000
Outstanding draws $ 577,600,000   384,571,000
Warehouse facility due October 7, 2022 | LIBOR      
Securities Financing Transaction      
Basis spread on variable rate 1.30%    
Warehouse facility due October 7, 2022 | Committed Lines      
Securities Financing Transaction      
Lines available $ 600,000,000    
Warehouse facility due October 7, 2022 | Committed Lines | Subsequent Event      
Securities Financing Transaction      
Lines available   $ 700,000,000  
Lines available, increase in borrowing capacity   $ 100,000,000  
Warehouse facility due October 7, 2022 | Committed Lines | SOFR      
Securities Financing Transaction      
Basis spread on variable rate 1.90%    
Warehouse facility due October 7, 2022 | Sublimit Lines      
Securities Financing Transaction      
Lines available $ 125,000,000    
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises 0    
Outstanding draws 0    
Fannie Mae repurchase agreement, open maturity      
Securities Financing Transaction      
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises 139,909,000   93,771,000
Outstanding draws $ 139,909,000   $ 93,771,000
Fannie Mae repurchase agreement, open maturity | LIBOR      
Securities Financing Transaction      
Basis spread on variable rate 1.15%    
Fannie Mae repurchase agreement, open maturity | Uncommitted Lines      
Securities Financing Transaction      
Lines available $ 400,000,000    
Warehouse facility due October 6, 2023 | Committed Lines      
Securities Financing Transaction      
Lines available $ 800,000,000