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LOANS RECEIVABLE - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 21,274,392 | $ 22,359,396 |
Ratio of loan type to all loans | 100.00% | 100.00% |
Allowance for loan losses | $ 199,720 | $ 203,753 | $ 177,207
Loans in process | 773,606 | 1,009,798 |
Net deferred fees, costs and discounts | 212,448 | 229,491 |
Total loan contra accounts | 1,185,774 | 1,443,042 |
Net loans | 20,088,618 | 20,916,354 |
Commercial loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 12,651,754 | $ 13,127,265 |
Ratio of loan type to all loans | 59.50% | 58.70% |
Allowance for loan losses | $ 152,134 | $ 153,373 | 137,194
Commercial loans | Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 4,718,480 | $ 4,658,119 |
Ratio of loan type to all loans | 22.20% | 20.80% |
Allowance for loan losses | $ 25,953 | $ 25,248 | 13,155
Commercial loans | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 3,604,600 | $ 3,757,040 |
Ratio of loan type to all loans | 16.90% | 16.80% |
Allowance for loan losses | $ 41,988 | $ 39,210 | 28,842
Commercial loans | Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 2,392,685 | $ 2,337,139 |
Ratio of loan type to all loans | 11.30% | 10.40% |
Allowance for loan losses | $ 59,163 | $ 58,748 | 58,773
Commercial loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 1,756,890 | $ 2,174,254 |
Ratio of loan type to all loans | 8.30% | 9.70% |
Allowance for loan losses | $ 18,136 | $ 22,267 | 29,408
Commercial loans | Land - acquisition & development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 179,099 | $ 200,713 |
Ratio of loan type to all loans | 0.80% | 1.00% |
Allowance for loan losses | $ 6,894 | $ 7,900 | 7,016
Consumer loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 8,622,638 | $ 9,232,131 |
Ratio of loan type to all loans | 40.50% | 41.30% |
Allowance for loan losses | $ 47,586 | $ 50,380 | 40,013
Consumer loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 150,237 | $ 384,161 |
Ratio of loan type to all loans | 0.70% | 1.70% |
Allowance for loan losses | $ 610 | $ 1,427 | 2,781
Consumer loans | Single-family residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 8,053,771 | $ 8,399,030 |
Ratio of loan type to all loans | 37.80% | 37.60% |
Allowance for loan losses | $ 38,880 | $ 40,523 | 28,029
Consumer loans | Land - consumer lot loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 89,298 | $ 108,791 |
Ratio of loan type to all loans | 0.40% | 0.50% |
Allowance for loan losses | $ 2,104 | $ 2,564 | 3,512
Consumer loans | HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 267,871 | $ 266,151 |
Ratio of loan type to all loans | 1.30% | 1.20% |
Allowance for loan losses | $ 3,069 | $ 3,049 | 2,859
Consumer loans | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 61,461 | $ 73,998 |
Ratio of loan type to all loans | 0.30% | 0.30% |
Allowance for loan losses | $ 2,923 | $ 2,817 | $ 2,832

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