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Loans Held for Investment and Allowance for Credit Losses - Additional Information (Details)
$ in Billions
3 Months Ended 9 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans purchased $ 3.7 $ 3.0 $ 11.7 $ 8.6
Threshold period for delinquent loans past due 4 days   4 days  
Past due charge-off threshold 120 days   120 days  
Minimum        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loan lending terms     1 month  
Proprietary credit quality score 0   0  
Maximum        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loan lending terms     60 months  
Proprietary credit quality score 100   100