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Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Details) - USD ($)
12 Months Ended
Dec. 15, 2023
Sep. 01, 2023
Dec. 31, 2023
Jul. 15, 2023
Dec. 31, 2022
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Carrying Value     $ 666,000,000   $ 448,000,000
Revolving credit facility, with interest ranging from 5.03% to 5.23%     0   178,000,000
Warehouse Agreement Borrowings          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Maximum Facility Size     3,200,000,000   3,600,000,000
Carrying Value     666,000,000   448,000,000
Warehouse Agreement Borrowings | JP Morgan | daily floating rate Secured Overnight Financing Rate (SOFR) rate plus 1.50%, with a SOFR adjustment rate of 0.05%          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Maximum Facility Size     1,335,000,000   1,335,000,000
Carrying Value     $ 613,000,000   331,000,000
Warehouse Agreement Borrowings | JP Morgan | daily floating rate Secured Overnight Financing Rate (SOFR) rate plus 1.50%, with a SOFR adjustment rate of 0.05% | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Basis spread on variable rate (percent) 1.50%   1.50%    
Warehouse Agreement Borrowings | JP Morgan | daily floating rate Secured Overnight Financing Rate (SOFR) rate plus 1.50%, with a SOFR adjustment rate of 0.05% | Secured Overnight Financing Rate (SOFR) Adjustment          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Basis spread on variable rate (percent) 0.05%   0.05%    
Warehouse Agreement Borrowings | JP Morgan | daily floating rate SOFR rate plus 2.75%, with a SOFR adjustment rate of 0.05%          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Maximum Facility Size     $ 15,000,000   15,000,000
Carrying Value     $ 0   0
Warehouse Agreement Borrowings | JP Morgan | daily floating rate SOFR rate plus 2.75%, with a SOFR adjustment rate of 0.05% | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Basis spread on variable rate (percent)     2.75%    
Warehouse Agreement Borrowings | JP Morgan | daily floating rate SOFR rate plus 2.75%, with a SOFR adjustment rate of 0.05% | Secured Overnight Financing Rate (SOFR) Adjustment          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Basis spread on variable rate (percent)     0.05%    
Warehouse Agreement Borrowings | Fannie Mae ASAP Program | daily floating SOFR plus 1.45%, with a SOFR floor of 0.25%          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Maximum Facility Size     $ 650,000,000   650,000,000
Carrying Value     $ 7,000,000   0
Warehouse Agreement Borrowings | Fannie Mae ASAP Program | daily floating SOFR plus 1.45%, with a SOFR floor of 0.25% | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Basis spread on variable rate (percent)     1.45%    
Warehouse Agreement Borrowings | Fannie Mae ASAP Program | daily floating SOFR plus 1.45%, with a SOFR floor of 0.25% | Secured Overnight Financing Rate (SOFR) Floor | Minimum          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Basis spread on variable rate (percent)     0.25%    
Warehouse Agreement Borrowings | T D Bank | daily floating rate SOFR plus 1.30%, with a SOFR adjustment rate of 0.10%          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Maximum Facility Size     $ 600,000,000 $ 300,000,000 800,000,000
Carrying Value     28,000,000   0
Revolving credit facility, with interest ranging from 5.03% to 5.23%     $ 300,000,000 $ 300,000,000  
Warehouse Agreement Borrowings | T D Bank | daily floating rate SOFR plus 1.30%, with a SOFR adjustment rate of 0.10% | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Basis spread on variable rate (percent)     1.30%    
Warehouse Agreement Borrowings | T D Bank | daily floating rate SOFR plus 1.30%, with a SOFR adjustment rate of 0.10% | Secured Overnight Financing Rate (SOFR) Adjustment          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Basis spread on variable rate (percent)     0.10%    
Warehouse Agreement Borrowings | Bank Of America | daily floating SOFR rate plus 1.25%, with a SOFR adjustment rate of 0.10%          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Maximum Facility Size     $ 350,000,000   350,000,000
Carrying Value     $ 18,000,000   115,000,000
Warehouse Agreement Borrowings | Bank Of America | daily floating SOFR rate plus 1.25%, with a SOFR adjustment rate of 0.10% | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Basis spread on variable rate (percent)   1.25% 1.25%    
Warehouse Agreement Borrowings | Bank Of America | daily floating SOFR rate plus 1.25%, with a SOFR adjustment rate of 0.10% | Secured Overnight Financing Rate (SOFR) Adjustment          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Basis spread on variable rate (percent)   0.10% 0.10%    
Warehouse Agreement Borrowings | Bank Of America | daily floating rate SOFR plus 1.25%, with a SOFR adjustment rate of 0.10%          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Maximum Facility Size     $ 250,000,000   250,000,000
Carrying Value     $ 0   0
Warehouse Agreement Borrowings | Bank Of America | daily floating rate SOFR plus 1.25%, with a SOFR adjustment rate of 0.10% | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Basis spread on variable rate (percent)   1.25% 1.25%    
Warehouse Agreement Borrowings | Bank Of America | daily floating rate SOFR plus 1.25%, with a SOFR adjustment rate of 0.10% | Secured Overnight Financing Rate (SOFR) Adjustment          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Basis spread on variable rate (percent)   0.10% 0.10%    
Warehouse Agreement Borrowings | MUFG Union Bank, N.A. (Union Bank) | MUFG Union Bank, N.A. (Union Bank), Pricing          
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]          
Maximum Facility Size     $ 0   200,000,000
Carrying Value     $ 0   $ 2,000,000