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LOANS RECEIVABLE - Schedule of Loan Modifications (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 143,305 | $ 104,492
% of Total Loan Class | 0.70% | 0.49%
Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 114,071 | $ 104,492
Wtd. Avg. Term Extension | 9 months | 13 months
Payment Deferral |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 29,235 | $ 0
Deferral Amount | 1,370 | 0
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 134,585 | $ 103,610
% of Total Loan Class | 1.13% | 0.85%
Commercial loans | Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 113,625 | $ 103,610
Commercial loans | Payment Deferral |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | 20,960 | 0
Deferral Amount | 1,134 | 0
Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 21,762 |
% of Total Loan Class | 0.46% |
Commercial loans | Multi-family | Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 21,762 |
Wtd. Avg. Term Extension | 15 months |
Commercial loans | Multi-family | Payment Deferral |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 0 |
Deferral Amount | 0 |
Commercial loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 32,560 | $ 23,449
% of Total Loan Class | 0.90% | 0.63%
Commercial loans | Commercial real estate | Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 15,000 | $ 23,449
Wtd. Avg. Term Extension | 6 months | 36 months
Commercial loans | Commercial real estate | Payment Deferral |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 17,560 | $ 0
Deferral Amount | 1,014 | 0
Commercial loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 57,431 | $ 61,074
% of Total Loan Class | 2.40% | 2.62%
Commercial loans | Commercial & industrial | Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 57,431 | $ 61,074
Wtd. Avg. Term Extension | 10 months | 4 months
Commercial loans | Commercial & industrial | Payment Deferral |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 0 | $ 0
Deferral Amount | 0 | 0
Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 22,832 | $ 19,087
% of Total Loan Class | 0.02% | 1.34%
Commercial loans | Construction | Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 19,432 | $ 19,087
Wtd. Avg. Term Extension | 6 months | 12 months
Commercial loans | Construction | Payment Deferral |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 3,400 | $ 0
Deferral Amount | 120 | 0
Consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 8,720 | $ 882
% of Total Loan Class | 0.10% | 0.01%
Consumer loans | Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 446 | $ 882
Consumer loans | Payment Deferral |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | 8,275 | 0
Deferral Amount | 236 | 0
Consumer loans | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 8,720 | $ 882
% of Total Loan Class | 0.11% | 0.01%
Consumer loans | Single-family residential | Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 446 | $ 882
Wtd. Avg. Term Extension | 6 months | 6 months
Consumer loans | Single-family residential | Payment Deferral |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 8,275 | $ 0
Deferral Amount | $ 236 | $ 0

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