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Loans Receivable, Net - Schedule of Troubled Debt Restructuring Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Modified loans | $ 16,930 | $ 22,863
Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Modified loans | 16,930 | 22,716
60-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Modified loans | 0 | 147
Commercial real estate – investor |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Modified loans | 16,684 | 19,645
Commercial real estate – investor | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Modified loans | 16,684 | 19,645
Commercial real estate – investor | 60-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Modified loans | 0 | 0
Commercial and industrial: | Commercial and Industrial - Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Modified loans |  | 2,896
Commercial and industrial: | Current | Commercial and Industrial - Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Modified loans |  | 2,896
Commercial and industrial: | 60-89 Days Past Due | Commercial and Industrial - Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Modified loans |  | 0
Residential Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Modified loans | 246 | 128
Residential Real Estate | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Modified loans | 246 | 128
Residential Real Estate | 60-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Modified loans | $ 0 | 0
Other consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Modified loans |  | 194
Other consumer | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Modified loans |  | 47
Other consumer | 60-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Modified loans |  | $ 147

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