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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 19,384,959,000 | $ 16,299,332,000 |
Ratio of loan type to all loans | 100.00% | 100.00% |
Allowance for loan losses | $ 172,808,000 | $ 171,300,000 | $ 166,955,000
Loans in process | 3,006,023,000 | 2,232,836,000 |
Net deferred fees, costs and discounts | 92,564,000 | 61,626,000 |
Total loan contra accounts | 3,271,395,000 | 2,465,762,000 |
Net loans | 16,113,564,000 | 13,833,570,000 |
Commercial loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 12,206,134,000 | $ 10,160,647,000 |
Ratio of loan type to all loans | 63.00% | 62.30% |
Allowance for loan losses | $ 133,476,000 | $ 125,375,000 | 109,923,000
Commercial loans | Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 2,645,801,000 | $ 2,291,477,000 |
Ratio of loan type to all loans | 13.70% | 14.00% |
Allowance for loan losses | $ 12,013,000 | $ 16,949,000 | 13,853,000
Commercial loans | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 3,133,660,000 | $ 2,443,845,000 |
Ratio of loan type to all loans | 16.20% | 15.00% |
Allowance for loan losses | $ 25,814,000 | $ 23,437,000 | 22,516,000
Commercial loans | Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 2,350,984,000 | $ 2,314,654,000 |
Ratio of loan type to all loans | 12.10% | 14.20% |
Allowance for loan losses | $ 57,210,000 | $ 45,957,000 | 38,665,000
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 10,237,000 | 311,795,000 |
Allowance for loan losses | 0 |  |
Commercial loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 3,784,388,000 | $ 2,888,214,000 |
Ratio of loan type to all loans | 19.50% | 17.70% |
Allowance for loan losses | $ 26,161,000 | $ 25,585,000 | 24,156,000
Commercial loans | Land - acquisition & development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 291,301,000 | $ 222,457,000 |
Ratio of loan type to all loans | 1.50% | 1.40% |
Allowance for loan losses | $ 12,278,000 | $ 13,447,000 | 10,733,000
Consumer loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 7,178,825,000 | $ 6,138,685,000 |
Ratio of loan type to all loans | 37.00% | 37.70% |
Allowance for loan losses | $ 39,332,000 | $ 45,925,000 | 57,032,000
Consumer loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 974,652,000 | $ 783,221,000 |
Ratio of loan type to all loans | 5.00% | 4.80% |
Allowance for loan losses | $ 3,410,000 | $ 4,907,000 | 3,555,000
Consumer loans | Single-family residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 5,771,862,000 | $ 4,951,627,000 |
Ratio of loan type to all loans | 29.80% | 30.40% |
Allowance for loan losses | $ 25,518,000 | $ 30,978,000 | 45,186,000
Consumer loans | Land - consumer lot loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 153,240,000 | $ 149,956,000 |
Ratio of loan type to all loans | 0.80% | 0.90% |
Allowance for loan losses | $ 5,047,000 | $ 4,939,000 | 2,729,000
Consumer loans | HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 203,528,000 | $ 165,989,000 |
Ratio of loan type to all loans | 1.00% | 1.00% |
Allowance for loan losses | $ 2,482,000 | $ 2,390,000 | 2,571,000
Consumer loans | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 75,543,000 | $ 87,892,000 |
Ratio of loan type to all loans | 0.40% | 0.50% |
Allowance for loan losses | $ 2,875,000 | $ 2,711,000 | $ 2,991,000

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