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Warehouse Facilities Collateralized by U.S. Government Sponsored Enterprises (Details) - USD ($)
9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Securities Financing Transaction    
Outstanding draws $ 609,457,000 $ 137,406,000
Committed Lines    
Securities Financing Transaction    
Lines available 1,500,000,000  
Uncommitted Lines    
Securities Financing Transaction    
Lines available 1,450,000,000  
Warehouse facility due June 12, 2024 Number 1    
Securities Financing Transaction    
Outstanding draws $ 0 0
Warehouse facility due June 12, 2024 Number 1 | SOFR    
Securities Financing Transaction    
Basis spread on variable rate 1.30%  
Warehouse facility due June 12, 2024 Number 1 | Committed Lines    
Securities Financing Transaction    
Lines available $ 450,000,000  
Warehouse facility due June 12, 2024 Number 2    
Securities Financing Transaction    
Outstanding draws $ 0 0
Warehouse facility due June 12, 2024 Number 2 | SOFR    
Securities Financing Transaction    
Basis spread on variable rate 1.30%  
Warehouse facility due June 12, 2024 Number 2 | Uncommitted Lines    
Securities Financing Transaction    
Lines available $ 300,000,000  
Warehouse facility due September 25, 2024 Number 1    
Securities Financing Transaction    
Outstanding draws $ 250,000,000 35,292,000
Warehouse facility due September 25, 2024 Number 1 | SOFR    
Securities Financing Transaction    
Basis spread on variable rate 1.30%  
Warehouse facility due September 25, 2024 Number 1 | Committed Lines    
Securities Financing Transaction    
Lines available $ 250,000,000  
Warehouse facility due September 25, 2024 Number 2    
Securities Financing Transaction    
Outstanding draws $ 25,015,000 0
Warehouse facility due September 25, 2024 Number 2 | SOFR    
Securities Financing Transaction    
Basis spread on variable rate 1.30%  
Warehouse facility due September 25, 2024 Number 2 | Uncommitted Lines    
Securities Financing Transaction    
Lines available $ 150,000,000  
Warehouse Facility Due October 6, 2023 Number 1    
Securities Financing Transaction    
Outstanding draws $ 334,442,000 102,114,000
Warehouse Facility Due October 6, 2023 Number 1 | SOFR    
Securities Financing Transaction    
Basis spread on variable rate 1.30%  
Warehouse Facility Due October 6, 2023 Number 1 | Committed Lines    
Securities Financing Transaction    
Lines available $ 800,000,000  
Warehouse Facility Due October 6, 2023 Number 1 | Committed Lines | SOFR    
Securities Financing Transaction    
Basis spread on variable rate 1.80%  
Warehouse Facility Due October 6, 2023 Number 1 | Sublimit Lines    
Securities Financing Transaction    
Lines available $ 125,000,000  
Outstanding draws 0 0
Warehouse Facility Due October 6, 2023 Number 2    
Securities Financing Transaction    
Outstanding draws $ 0 0
Warehouse Facility Due October 6, 2023 Number 2 | SOFR    
Securities Financing Transaction    
Basis spread on variable rate 1.30%  
Warehouse Facility Due October 6, 2023 Number 2 | Uncommitted Lines    
Securities Financing Transaction    
Lines available $ 600,000,000  
Fannie Mae repurchase agreement, open maturity    
Securities Financing Transaction    
Outstanding draws $ 0 $ 0
Fannie Mae repurchase agreement, open maturity | SOFR    
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