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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 22,598,153 |  | $ 19,648,504 |  |  |
Ratio of loan type to all loans | 100.00% |  | 100.00% |  |  |
Allowance for credit losses on loans | $ 201,577 | $ 179,320 | $ 177,207 | $ 177,420 | $ 176,797 | $ 172,808
Loans in process | 1,303,978 |  | 1,895,940 |  |  |
Net deferred fees, costs and discounts | 297,339 |  | 98,807 |  |  |
Total loan contra accounts | 1,802,894 |  | 2,171,954 |  |  |
Net loans | 20,795,259 |  | 17,476,550 |  |  |
Commercial loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 12,882,231 |  | $ 12,094,294 |  |  |
Ratio of loan type to all loans | 57.00% |  | 61.60% |  |  |
Allowance for credit losses on loans | $ 149,413 | 139,155 | $ 137,194 | 137,665 | 138,282 | 133,476
Commercial loans | Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 4,173,375 |  | $ 2,907,086 |  |  |
Ratio of loan type to all loans | 18.50% |  | 14.80% |  |  |
Allowance for credit losses on loans | $ 21,979 | 13,791 | $ 13,155 | 13,038 | 12,324 | 12,013
Commercial loans | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 3,570,790 |  | $ 3,344,959 |  |  |
Ratio of loan type to all loans | 15.80% |  | 17.00% |  |  |
Allowance for credit losses on loans | $ 32,991 | 29,007 | $ 28,842 | 27,803 | 27,380 | 25,814
Commercial loans | Commercial & industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 2,290,452 |  | $ 2,321,717 |  |  |
Ratio of loan type to all loans | 10.10% |  | 11.80% |  |  |
Allowance for credit losses on loans | $ 59,261 | 60,836 | $ 58,773 | 63,301 | 63,873 | 57,210
Commercial loans | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 2,631,783 |  | $ 3,318,994 |  |  |
Ratio of loan type to all loans | 11.60% |  | 16.90% |  |  |
Allowance for credit losses on loans | $ 27,317 | 28,863 | $ 29,408 | 26,027 | 26,133 | 26,161
Commercial loans | Land - acquisition & development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 215,831 |  | $ 201,538 |  |  |
Ratio of loan type to all loans | 1.00% |  | 1.00% |  |  |
Allowance for credit losses on loans | $ 7,865 | 6,658 | $ 7,016 | 7,496 | 8,572 | 12,278
Consumer loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 9,715,922 |  | $ 7,554,210 |  |  |
Ratio of loan type to all loans | 43.00% |  | 38.40% |  |  |
Allowance for credit losses on loans | $ 52,164 | 40,165 | $ 40,013 | 39,755 | 38,515 | 39,332
Consumer loans | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 466,740 |  | $ 672,643 |  |  |
Ratio of loan type to all loans | 2.10% |  | 3.40% |  |  |
Allowance for credit losses on loans | $ 1,918 | 2,262 | $ 2,781 | 3,456 | 3,500 | 3,410
Consumer loans | Single-family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 8,816,039 |  | $ 6,451,270 |  |  |
Ratio of loan type to all loans | 39.00% |  | 32.80% |  |  |
Allowance for credit losses on loans | $ 41,054 | 28,556 | $ 28,029 | 26,916 | 25,475 | 25,518
Consumer loans | Land - consumer lot loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 115,022 |  | $ 125,723 |  |  |
Ratio of loan type to all loans | 0.50% |  | 0.60% |  |  |
Allowance for credit losses on loans | $ 3,214 | 3,345 | $ 3,512 | 3,945 | 4,142 | 5,047
Consumer loans | HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 243,852 |  | $ 234,410 |  |  |
Ratio of loan type to all loans | 1.10% |  | 1.20% |  |  |
Allowance for credit losses on loans | $ 2,974 | 2,973 | $ 2,859 | 2,662 | 2,588 | 2,482
Consumer loans | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 74,269 |  | $ 70,164 |  |  |
Ratio of loan type to all loans | 0.30% |  | 0.40% |  |  |
Allowance for credit losses on loans | $ 3,004 | $ 3,029 | $ 2,832 | $ 2,776 | $ 2,810 | $ 2,875

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