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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held for sale | $ 468,527 |  | $ 0 |  |  |
Gross loans | $ 22,466,841 |  | $ 19,648,504 |  |  |
Ratio of loan type to all loans | 100.00% |  | 100.00% |  |  |
Allowance for credit losses on loans | $ 203,824 | $ 201,577 | $ 177,207 | $ 178,069 | $ 177,420 | $ 172,808
Loans in process | 1,094,956 |  | 1,895,940 |  |  |
Net deferred fees, costs and discounts | 294,142 |  | 98,807 |  |  |
Total loan contra accounts | 1,592,922 |  | 2,171,954 |  |  |
Net loans | 20,873,919 |  | 17,476,550 |  |  |
Commercial loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 13,235,910 |  | $ 12,094,294 |  |  |
Ratio of loan type to all loans | 58.90% |  | 61.60% |  |  |
Allowance for credit losses on loans | $ 153,195 | 149,413 | $ 137,194 | 138,185 | 137,665 | 133,476
Commercial loans | Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 4,616,359 |  | $ 2,907,086 |  |  |
Ratio of loan type to all loans | 20.50% |  | 14.80% |  |  |
Allowance for credit losses on loans | $ 25,199 | 21,979 | $ 13,155 | 12,976 | 13,038 | 12,013
Commercial loans | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 3,781,247 |  | $ 3,344,959 |  |  |
Ratio of loan type to all loans | 16.80% |  | 17.00% |  |  |
Allowance for credit losses on loans | $ 39,756 | 32,991 | $ 28,842 | 28,132 | 27,803 | 25,814
Commercial loans | Commercial & industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 2,394,978 |  | $ 2,321,717 |  |  |
Ratio of loan type to all loans | 10.70% |  | 11.80% |  |  |
Allowance for credit losses on loans | $ 57,833 | 59,261 | $ 58,773 | 61,915 | 63,301 | 57,210
Commercial loans | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 2,247,530 |  | $ 3,318,994 |  |  |
Ratio of loan type to all loans | 10.00% |  | 16.90% |  |  |
Allowance for credit losses on loans | $ 22,707 | 27,317 | $ 29,408 | 27,916 | 26,027 | 26,161
Commercial loans | Land - acquisition & development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 195,796 |  | $ 201,538 |  |  |
Ratio of loan type to all loans | 0.90% |  | 1.00% |  |  |
Allowance for credit losses on loans | $ 7,700 | 7,865 | $ 7,016 | 7,246 | 7,496 | 12,278
Consumer loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 9,230,931 |  | $ 7,554,210 |  |  |
Ratio of loan type to all loans | 41.10% |  | 38.40% |  |  |
Allowance for credit losses on loans | $ 50,629 | 52,164 | $ 40,013 | 39,884 | 39,755 | 39,332
Consumer loans | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 414,483 |  | $ 672,643 |  |  |
Ratio of loan type to all loans | 1.90% |  | 3.40% |  |  |
Allowance for credit losses on loans | $ 1,494 | 1,918 | $ 2,781 | 3,221 | 3,456 | 3,410
Consumer loans | Single-family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 8,364,415 |  | $ 6,451,270 |  |  |
Ratio of loan type to all loans | 37.20% |  | 32.80% |  |  |
Allowance for credit losses on loans | $ 40,316 | 41,054 | $ 28,029 | 27,083 | 26,916 | 25,518
Consumer loans | Land - consumer lot loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 112,317 |  | $ 125,723 |  |  |
Ratio of loan type to all loans | 0.50% |  | 0.60% |  |  |
Allowance for credit losses on loans | $ 2,648 | 3,214 | $ 3,512 | 3,770 | 3,945 | 5,047
Consumer loans | HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 255,271 |  | $ 234,410 |  |  |
Ratio of loan type to all loans | 1.10% |  | 1.20% |  |  |
Allowance for credit losses on loans | $ 2,924 | 2,974 | $ 2,859 | 2,743 | 2,662 | 2,482
Consumer loans | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 84,445 |  | $ 70,164 |  |  |
Ratio of loan type to all loans | 0.40% |  | 0.40% |  |  |
Allowance for credit losses on loans | $ 3,247 | $ 3,004 | $ 2,832 | $ 3,067 | $ 2,776 | $ 2,875

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