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Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for credit losses $ 343 $ 0
Unfunded Loan Commitment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, after allowance for credit loss $ 259