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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 17,024,965 | $ 16,299,332
Ratio of loan type to all loans | 100.00% | 100.00%
Allowance for credit losses on loans | $ 171,411 | $ 171,300
Loans in process | 2,207,880 | 2,232,836
Net deferred fees, costs and discounts | 53,472 | 61,626
Total loan contra accounts | 2,432,763 | 2,465,762
Net loans | 14,592,202 | 13,833,570
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 10,545,687 | $ 10,160,647
Ratio of loan type to all loans | 61.90% | 62.30%
Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 2,298,155 | $ 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 | $ 2,681,453 | $ 2,443,845
Ratio of loan type to all loans | 15.80% | 15.00%
Commercial loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 2,373,012 | $ 2,314,654
Ratio of loan type to all loans | 13.90% | 14.20%
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 202,261 | $ 311,795
Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 2,967,644 | $ 2,888,214
Ratio of loan type to all loans | 17.40% | 17.70%
Commercial loans | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 225,423 | $ 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 | $ 6,479,278 | $ 6,138,685
Ratio of loan type to all loans | 38.10% | 37.70%
Consumer loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 787,862 | $ 783,221
Ratio of loan type to all loans | 4.60% | 4.80%
Consumer loans | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 5,295,837 | $ 4,951,627
Ratio of loan type to all loans | 31.10% | 30.40%
Consumer loans | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 151,297 | $ 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 | $ 166,601 | $ 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 | $ 77,681 | $ 87,892
Ratio of loan type to all loans | 0.50% | 0.50%

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