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Commitments and Contingencies (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 16, 2021
Dec. 31, 2020
Class A Common Stock      
Loss Contingencies [Line Items]      
Shares outstanding (in shares) 41,715,627   40,335,113
Entity Common Stock, Shares Outstanding 41,715,627    
Class A Common Stock | Great Western Bank      
Loss Contingencies [Line Items]      
Shares outstanding (in shares)   0.8425  
Common Stock, Value, Outstanding   $ 2,000.0  
Mortgage Loans Held For Sale [Member]      
Loss Contingencies [Line Items]      
Mortgage loans with recourse provision in effect $ 0.4    
Construction Contracts      
Loss Contingencies [Line Items]      
Commitments under construction contracts $ 3.3