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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 19,648,504 | $ 19,384,959 |
Ratio of loan type to all loans | 100.00% | 100.00% |
Allowance for loan losses | $ 177,207 | $ 172,808 | $ 171,300
Loans in process | 1,895,940 | 3,006,023 |
Net deferred fees, costs and discounts | 98,807 | 92,564 |
Total loan contra accounts | 2,171,954 | 3,271,395 |
Net loans | 17,476,550 | 16,113,564 |
Commercial loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 12,094,294 | $ 12,206,134 |
Ratio of loan type to all loans | 61.60% | 63.00% |
Allowance for loan losses | $ 137,194 | $ 133,476 | 125,375
Commercial loans | Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 2,907,086 | $ 2,645,801 |
Ratio of loan type to all loans | 14.80% | 13.70% |
Allowance for loan losses | $ 13,155 | $ 12,013 | 16,949
Commercial loans | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 3,344,959 | $ 3,133,660 |
Ratio of loan type to all loans | 17.00% | 16.20% |
Allowance for loan losses | $ 28,842 | $ 25,814 | 23,437
Commercial loans | Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 2,321,717 | $ 2,350,984 |
Ratio of loan type to all loans | 11.80% | 12.10% |
Allowance for loan losses | $ 58,773 | $ 57,210 | 45,957
Commercial loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 3,318,994 | $ 3,784,388 |
Ratio of loan type to all loans | 16.90% | 19.50% |
Allowance for loan losses | $ 29,408 | $ 26,161 | 25,585
Commercial loans | Land - acquisition & development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 201,538 | $ 291,301 |
Ratio of loan type to all loans | 1.10% | 1.50% |
Allowance for loan losses | $ 7,016 | $ 12,278 | 13,447
Consumer loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 7,554,210 | $ 7,178,825 |
Ratio of loan type to all loans | 38.40% | 37.00% |
Allowance for loan losses | $ 40,013 | $ 39,332 | 45,925
Consumer loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 672,643 | $ 974,652 |
Ratio of loan type to all loans | 3.40% | 5.00% |
Allowance for loan losses | $ 2,781 | $ 3,410 | 4,907
Consumer loans | Single-family residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 6,451,270 | $ 5,771,862 |
Ratio of loan type to all loans | 32.80% | 29.80% |
Allowance for loan losses | $ 28,029 | $ 25,518 | 30,978
Consumer loans | Land - consumer lot loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 125,723 | $ 153,240 |
Ratio of loan type to all loans | 0.60% | 0.80% |
Allowance for loan losses | $ 3,512 | $ 5,047 | 4,939
Consumer loans | HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 234,410 | $ 203,528 |
Ratio of loan type to all loans | 1.20% | 1.00% |
Allowance for loan losses | $ 2,859 | $ 2,482 | 2,390
Consumer loans | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 70,164 | $ 75,543 |
Ratio of loan type to all loans | 0.40% | 0.40% |
Allowance for loan losses | $ 2,832 | $ 2,875 | $ 2,711

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