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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 16,299,332,000 | $ 14,467,722,000 |
Ratio of loan type to all loans | 100.00% | 100.00% |
Allowance for loan losses | $ 171,300,000 | $ 166,955,000 | $ 131,534,000
Loans in process | 2,232,836,000 | 1,456,072,000 |
Net deferred fees, costs and discounts | 61,626,000 | 52,378,000 |
Total loan contra accounts | 2,465,762,000 | 1,675,405,000 |
Net loans | 13,833,570,000 | 12,792,317,000 |
Commercial loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 10,160,647,000 | $ 8,163,029,000 |
Ratio of loan type to all loans | 62.30% | 56.30% |
Allowance for loan losses | $ 125,375,000 | $ 109,923,000 | 93,470,000
Commercial loans | Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 2,291,477,000 | $ 1,538,762,000 |
Ratio of loan type to all loans | 14.00% | 10.60% |
Allowance for loan losses | $ 16,949,000 | $ 13,853,000 | 7,391,000
Commercial loans | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 2,443,845,000 | $ 1,895,086,000 |
Ratio of loan type to all loans | 15.00% | 13.10% |
Allowance for loan losses | $ 23,437,000 | $ 22,516,000 | 13,170,000
Commercial loans | Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 2,314,654,000 | $ 2,132,160,000 |
Ratio of loan type to all loans | 14.20% | 14.70% |
Allowance for loan losses | $ 45,957,000 | $ 38,665,000 | 31,450,000
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 311,795,000 | 762,004,000 |
Allowance for loan losses | 0 |  |
Net loans | 305,162,000 |  |
Commercial loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 2,888,214,000 | $ 2,403,276,000 |
Ratio of loan type to all loans | 17.70% | 16.60% |
Allowance for loan losses | $ 25,585,000 | $ 24,156,000 | 32,304,000
Commercial loans | Land - acquisition & development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 222,457,000 | $ 193,745,000 |
Ratio of loan type to all loans | 1.40% | 1.30% |
Allowance for loan losses | $ 13,447,000 | $ 10,733,000 | 9,155,000
Consumer loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 6,138,685,000 | $ 6,304,693,000 |
Ratio of loan type to all loans | 37.70% | 43.70% |
Allowance for loan losses | $ 45,925,000 | $ 57,032,000 | 38,064,000
Consumer loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 783,221,000 | $ 674,879,000 |
Ratio of loan type to all loans | 4.80% | 4.70% |
Allowance for loan losses | $ 4,907,000 | $ 3,555,000 | 1,369,000
Consumer loans | Single-family residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 4,951,627,000 | $ 5,304,689,000 |
Ratio of loan type to all loans | 30.40% | 36.70% |
Allowance for loan losses | $ 30,978,000 | $ 45,186,000 | 30,988,000
Consumer loans | Land - consumer lot loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 149,956,000 | $ 102,263,000 |
Ratio of loan type to all loans | 0.90% | 0.70% |
Allowance for loan losses | $ 4,939,000 | $ 2,729,000 | 2,143,000
Consumer loans | HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 165,989,000 | $ 139,703,000 |
Ratio of loan type to all loans | 1.00% | 1.00% |
Allowance for loan losses | $ 2,390,000 | $ 2,571,000 | 1,103,000
Consumer loans | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 87,892,000 | $ 83,159,000 |
Ratio of loan type to all loans | 0.50% | 0.60% |
Allowance for loan losses | $ 2,711,000 | $ 2,991,000 | $ 2,461,000

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