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Fair Value of Financial Assets and Liabilities - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Unpaid balance on loans sold with retained servicing rights $ 4,600,000 $ 3,100,000 $ 7,400,000 $ 5,200,000        
Unpaid principal balance on serviced sold loans 6,900,000   6,900,000     $ 5,100,000    
Servicing income 28,690 22,436 54,674 42,593        
Servicing assets 800   800     600    
Servicing liabilities $ 200   $ 200     700    
Fair value, liability, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income     Other income, net          
Economic risk retention 5.00%   5.00%          
Notional Amount $ 572,441   $ 572,441     1,004,589    
Derivative instruments 7,676   7,676     17,207    
Derivative Liabilities 186   186     38    
Risk Sharing Arrangement                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Derivative instruments 45,000   45,000     33,900    
Credit Risk Contract                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Notional Amount 6,800,000   6,800,000     4,200,000    
Loss sharing arrangement, maximum exposure to losses 85,100   85,100     81,200    
Risk Sharing Liabilities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loss sharing arrangement, maximum exposure to losses 40,100   40,100          
Risk Sharing Assets                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loss sharing arrangement, maximum exposure to losses 45,000   45,000          
Senior Notes and Residual Trust Certificates                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Aggregate fair value 69,051 32,411 69,051 32,411 $ 38,926 51,670 $ 13,983 $ 18,913
Risk Sharing Arrangement                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Aggregate fair value 1,498 $ 512 1,498 $ 512 $ 1,801 918 $ 471 $ 0
Derivative Liabilities $ 1,500   $ 1,500     $ 900