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LOANS HELD FOR INVESTMENT, NET - Performance of Modified Loans, After 12 Months (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | $ 112,989 | $ 37,747
Current |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | 82,716 | 36,849
30 to 59 Days Past Due |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | 1,001 |
60 to 89 Days Past Due |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | 27,599 |
Non-Accrual |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | 1,673 | 898
Business Loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | 19,339 | 10,188
Business Loans | Current |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | 17,565 | 9,290
Business Loans | 30 to 59 Days Past Due |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | 1,001 |
Business Loans | Non-Accrual |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | 773 | 898
One-to-Four Family Residential and Cooperative/Condominium Apartment |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | 3,749 | 2,854
One-to-Four Family Residential and Cooperative/Condominium Apartment | Current |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | 2,849 | 2,854
One-to-Four Family Residential and Cooperative/Condominium Apartment | Non-Accrual |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | 900 |
Multifamily Residential and Residential Mixed-Use |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | 34,095 |
Multifamily Residential and Residential Mixed-Use | Current |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | 6,496 |
Multifamily Residential and Residential Mixed-Use | 60 to 89 Days Past Due |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | 27,599 |
Non-Owner-Occupied Commercial Real Estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | 55,806 | 24,705
Non-Owner-Occupied Commercial Real Estate | Current |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty | $ 55,806 | $ 24,705

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