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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 20,260,711 | $ 19,384,959 |  |
Ratio of loan type to all loans | 100.00% | 100.00% |  |
Allowance for credit losses on loans | $ 176,797 | $ 172,808 | $ 171,411 | $ 171,300
Loans in process | 2,997,839 | 3,006,023 |  |
Net deferred fees, costs and discounts | 92,487 | 92,564 |  |
Total loan contra accounts | 3,267,123 | 3,271,395 |  |
Net loans | 16,993,588 | 16,113,564 |  |
Commercial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 12,887,691 | $ 12,206,134 |  |
Ratio of loan type to all loans | 63.60% | 63.00% |  |
Allowance for credit losses on loans | $ 138,282 | $ 133,476 | 127,837 | 125,375
Commercial loans | Multi-family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 2,713,331 | $ 2,645,801 |  |
Ratio of loan type to all loans | 13.40% | 13.70% |  |
Allowance for credit losses on loans | $ 12,324 | $ 12,013 | 15,993 | 16,949
Commercial loans | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 3,237,073 | $ 3,133,660 |  |
Ratio of loan type to all loans | 16.00% | 16.20% |  |
Allowance for credit losses on loans | $ 27,380 | $ 25,814 | 25,722 | 23,437
Commercial loans | Commercial & industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 2,628,131 | $ 2,350,984 |  |
Ratio of loan type to all loans | 13.00% | 12.10% |  |
Allowance for credit losses on loans | $ 63,873 | $ 57,210 | 47,231 | 45,957
Commercial loans | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 4,055,474 | $ 3,784,388 |  |
Ratio of loan type to all loans | 20.00% | 19.50% |  |
Allowance for credit losses on loans | $ 26,133 | $ 26,161 | 24,766 | 25,585
Commercial loans | Land - acquisition & development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 253,682 | $ 291,301 |  |
Ratio of loan type to all loans | 1.20% | 1.50% |  |
Allowance for credit losses on loans | $ 8,572 | $ 12,278 | 14,125 | 13,447
Consumer loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 7,373,020 | $ 7,178,825 |  |
Ratio of loan type to all loans | 36.40% | 37.00% |  |
Allowance for credit losses on loans | $ 38,515 | $ 39,332 | 43,574 | 45,925
Consumer loans | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 926,126 | $ 974,652 |  |
Ratio of loan type to all loans | 4.60% | 5.00% |  |
Allowance for credit losses on loans | $ 3,500 | $ 3,410 | 3,719 | 4,907
Consumer loans | Single-family residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 6,013,410 | $ 5,771,862 |  |
Ratio of loan type to all loans | 29.70% | 29.80% |  |
Allowance for credit losses on loans | $ 25,475 | $ 25,518 | 30,106 | 30,978
Consumer loans | Land - consumer lot loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 148,246 | $ 153,240 |  |
Ratio of loan type to all loans | 0.70% | 0.80% |  |
Allowance for credit losses on loans | $ 4,142 | $ 5,047 | 4,984 | 4,939
Consumer loans | HELOC |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 212,123 | $ 203,528 |  |
Ratio of loan type to all loans | 1.00% | 1.00% |  |
Allowance for credit losses on loans | $ 2,588 | $ 2,482 | 2,365 | 2,390
Consumer loans | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 73,115 | $ 75,543 |  |
Ratio of loan type to all loans | 0.40% | 0.40% |  |
Allowance for credit losses on loans | $ 2,810 | $ 2,875 | $ 2,400 | $ 2,711

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