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Lines of Credit - Summary of Line of Credit with Financial Institutions (Details) - USD ($)
$ in Thousands
12 Months Ended
May 15, 2020
Dec. 31, 2020
Sep. 30, 2021
Dec. 31, 2019
Line of Credit Facility [Line Items]        
Committed line amount   $ 320,300 $ 0  
UNITED WHOLESALE MORTGAGE, LLC        
Line of Credit Facility [Line Items]        
Committed line amount   320,300   $ 376,000
Line of credit facility, expiration date Sep. 16, 2020      
$400 Million Line of Credit Agreement Expiring December 31, 2022 | UNITED WHOLESALE MORTGAGE, LLC        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity   400,000    
Committed line amount   $ 320,300   251,000
Line of credit facility, expiration date   Dec. 31, 2022    
Line of credit facility, collateral fees amount   $ 989,500    
$125 Million Line of Credit Agreement Expired September 14, 2020 | UNITED WHOLESALE MORTGAGE, LLC        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity   125,000    
Committed line amount   $ 0   $ 125,000
Line of credit facility, expiration date   Sep. 14, 2020