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Commitment and Contingencies (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net | $ 20,873,919 | $ 17,476,550
FHLB advances |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net | 867,606 |
Unfunded commitments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net | 2,990,744 |
Off-balance-sheet credit reserve | $ 21,500 | $ 24,500

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