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Commitment and Contingencies (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Net loans | $ 20,920,001 | $ 20,916,354
Off-balance-sheet credit reserve | 20,000 | 21,500
LIHTC investment amount | 138,295 | 112,342
LIHTC commitment amount | 61,411 | $ 41,702
FHLB advances |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Net loans | 1,047,606 |
Unfunded commitments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Net loans | $ 2,641,671 |

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