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Commitment and Contingencies (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans in process $ 1,303,978 $ 1,895,940
Off-balance-sheet credit reserve 23,500 24,500
Financing Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans in process $ 3,859,416 $ 3,625,333