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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 22,359,396 | $ 19,648,504 |
Ratio of loan type to all loans | 100.00% | 100.00% |
Allowance for loan losses | $ 203,753 | $ 177,207 | $ 172,808
Loans in process | 1,009,798 | 1,895,940 |
Net deferred fees, costs and discounts | 229,491 | 98,807 |
Total loan contra accounts | 1,443,042 | 2,171,954 |
Net loans | 20,916,354 | 17,476,550 |
Commercial loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 13,127,265 | $ 12,094,294 |
Ratio of loan type to all loans | 58.70% | 61.60% |
Allowance for loan losses | $ 153,373 | $ 137,194 | 133,476
Commercial loans | Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 4,658,119 | $ 2,907,086 |
Ratio of loan type to all loans | 20.80% | 14.80% |
Allowance for loan losses | $ 25,248 | $ 13,155 | 12,013
Commercial loans | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 3,757,040 | $ 3,344,959 |
Ratio of loan type to all loans | 16.80% | 17.00% |
Allowance for loan losses | $ 39,210 | $ 28,842 | 25,814
Commercial loans | Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 2,337,139 | $ 2,321,717 |
Ratio of loan type to all loans | 10.40% | 11.80% |
Allowance for loan losses | $ 58,748 | $ 58,773 | 57,210
Commercial loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 2,174,254 | $ 3,318,994 |
Ratio of loan type to all loans | 9.70% | 16.90% |
Allowance for loan losses | $ 22,267 | $ 29,408 | 26,161
Commercial loans | Land - acquisition & development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 200,713 | $ 201,538 |
Ratio of loan type to all loans | 1.00% | 1.00% |
Allowance for loan losses | $ 7,900 | $ 7,016 | 12,278
Consumer loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 9,232,131 | $ 7,554,210 |
Ratio of loan type to all loans | 41.30% | 38.40% |
Allowance for loan losses | $ 50,380 | $ 40,013 | 39,332
Consumer loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 384,161 | $ 672,643 |
Ratio of loan type to all loans | 1.70% | 3.40% |
Allowance for loan losses | $ 1,427 | $ 2,781 | 3,410
Consumer loans | Single-family residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 8,399,030 | $ 6,451,270 |
Ratio of loan type to all loans | 37.60% | 32.80% |
Allowance for loan losses | $ 40,523 | $ 28,029 | 25,518
Consumer loans | Land - consumer lot loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 108,791 | $ 125,723 |
Ratio of loan type to all loans | 0.50% | 0.60% |
Allowance for loan losses | $ 2,564 | $ 3,512 | 5,047
Consumer loans | HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 266,151 | $ 234,410 |
Ratio of loan type to all loans | 1.20% | 1.20% |
Allowance for loan losses | $ 3,049 | $ 2,859 | 2,482
Consumer loans | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 73,998 | $ 70,164 |
Ratio of loan type to all loans | 0.30% | 0.40% |
Allowance for loan losses | $ 2,817 | $ 2,832 | $ 2,875

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