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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 17,775,453 | $ 16,299,332
Ratio of loan type to all loans | 100.00% | 100.00%
Allowance for credit losses on loans | $ 171,384 | $ 171,300
Loans in process | 2,440,430 | 2,232,836
Net deferred fees, costs and discounts | 68,713 | 61,626
Total loan contra accounts | 2,680,527 | 2,465,762
Net loans | 15,094,926 | 13,833,570
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 11,099,750 | $ 10,160,647
Ratio of loan type to all loans | 62.40% | 62.30%
Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 2,392,810 | $ 2,291,477
Ratio of loan type to all loans | 13.50% | 14.00%
Commercial loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 2,829,946 | $ 2,443,845
Ratio of loan type to all loans | 15.90% | 15.00%
Commercial loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 2,504,442 | $ 2,314,654
Ratio of loan type to all loans | 14.10% | 14.20%
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 111,000 | $ 312,000
Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 3,136,239 | $ 2,888,214
Ratio of loan type to all loans | 17.60% | 17.70%
Commercial loans | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 236,313 | $ 222,457
Ratio of loan type to all loans | 1.30% | 1.40%
Consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 6,675,703 | $ 6,138,685
Ratio of loan type to all loans | 37.60% | 37.70%
Consumer loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 836,314 | $ 783,221
Ratio of loan type to all loans | 4.70% | 4.80%
Consumer loans | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 5,442,535 | $ 4,951,627
Ratio of loan type to all loans | 30.60% | 30.40%
Consumer loans | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 154,976 | $ 149,956
Ratio of loan type to all loans | 0.90% | 0.90%
Consumer loans | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 174,367 | $ 165,989
Ratio of loan type to all loans | 1.00% | 1.00%
Consumer loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 67,511 | $ 87,892
Ratio of loan type to all loans | 0.40% | 0.50%

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