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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 22,158,727 |  | $ 22,359,396 |  |  |
Ratio of loan type to all loans | 100.00% |  | 100.00% |  |  |
Allowance for credit losses on loans | $ 202,709 | $ 204,522 | $ 203,753 | $ 201,577 | $ 179,320 | $ 177,207
Loans in process | 798,996 |  | 1,009,798 |  |  |
Net deferred fees, costs and discounts | 237,021 |  | 229,491 |  |  |
Total loan contra accounts | 1,238,726 |  | 1,443,042 |  |  |
Net loans | 20,920,001 |  | 20,916,354 |  |  |
Commercial loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 12,991,513 |  | $ 13,127,265 |  |  |
Ratio of loan type to all loans | 58.60% |  | 58.70% |  |  |
Allowance for credit losses on loans | $ 151,281 | 152,468 | $ 153,373 | 149,413 | 139,155 | 137,194
Commercial loans | Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 4,967,125 |  | $ 4,658,119 |  |  |
Ratio of loan type to all loans | 22.40% |  | 20.80% |  |  |
Allowance for credit losses on loans | $ 26,556 | 25,997 | $ 25,248 | 21,979 | 13,791 | 13,155
Commercial loans | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 3,665,363 |  | $ 3,757,040 |  |  |
Ratio of loan type to all loans | 16.50% |  | 16.80% |  |  |
Allowance for credit losses on loans | $ 38,469 | 37,873 | $ 39,210 | 32,991 | 29,007 | 28,842
Commercial loans | Commercial & industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 2,389,025 |  | $ 2,337,139 |  |  |
Ratio of loan type to all loans | 10.80% |  | 10.40% |  |  |
Allowance for credit losses on loans | $ 60,147 | 60,474 | $ 58,748 | 59,261 | 60,836 | 58,773
Commercial loans | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 1,791,886 |  | $ 2,174,254 |  |  |
Ratio of loan type to all loans | 8.10% |  | 9.70% |  |  |
Allowance for credit losses on loans | $ 19,406 | 20,903 | $ 22,267 | 27,317 | 28,863 | 29,408
Commercial loans | Land - acquisition & development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 178,114 |  | $ 200,713 |  |  |
Ratio of loan type to all loans | 0.80% |  | 1.00% |  |  |
Allowance for credit losses on loans | $ 6,703 | 7,221 | $ 7,900 | 7,865 | 6,658 | 7,016
Consumer loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 9,167,214 |  | $ 9,232,131 |  |  |
Ratio of loan type to all loans | 41.40% |  | 41.30% |  |  |
Allowance for credit losses on loans | $ 51,428 | 52,054 | $ 50,380 | 52,164 | 40,165 | 40,013
Consumer loans | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 287,461 |  | $ 384,161 |  |  |
Ratio of loan type to all loans | 1.30% |  | 1.70% |  |  |
Allowance for credit losses on loans | $ 1,076 | 1,219 | $ 1,427 | 1,918 | 2,262 | 2,781
Consumer loans | Single-family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 8,401,084 |  | $ 8,399,030 |  |  |
Ratio of loan type to all loans | 37.90% |  | 37.60% |  |  |
Allowance for credit losses on loans | $ 40,963 | 42,117 | $ 40,523 | 41,054 | 28,556 | 28,029
Consumer loans | Land - consumer lot loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 102,475 |  | $ 108,791 |  |  |
Ratio of loan type to all loans | 0.50% |  | 0.50% |  |  |
Allowance for credit losses on loans | $ 2,415 | 2,527 | $ 2,564 | 3,214 | 3,345 | 3,512
Consumer loans | HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 284,295 |  | $ 266,151 |  |  |
Ratio of loan type to all loans | 1.30% |  | 1.20% |  |  |
Allowance for credit losses on loans | $ 3,257 | 3,158 | $ 3,049 | 2,974 | 2,973 | 2,859
Consumer loans | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 91,899 |  | $ 73,998 |  |  |
Ratio of loan type to all loans | 0.40% |  | 0.30% |  |  |
Allowance for credit losses on loans | $ 3,717 | $ 3,033 | $ 2,817 | $ 3,004 | $ 3,029 | $ 2,832

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