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Debt - Schedule of Warehouse Lines of Credit (Details) - USD ($)
Jun. 30, 2021
Jun. 26, 2021
Jun. 25, 2021
Comerica Bank      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity   $ 60,000,000.0 $ 100,000,000.0
Line of Credit | Mortgages segment      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity $ 460,000,000    
Line of Credit | Credit Suisse AG, Cayman Islands | Mortgages segment      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity $ 300,000,000    
Weighted-Average Interest Rate 2.50%    
Line of Credit | Citibank, N.A. | Mortgages segment      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity $ 100,000,000    
Weighted-Average Interest Rate 1.85%    
Line of Credit | Comerica Bank | Mortgages segment      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity $ 60,000,000    
Weighted-Average Interest Rate 2.70%