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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 15,265,588,000 |  | $ 14,467,722,000 |  |  |
Ratio of loan type to all loans | 100.00% |  | 100.00% |  |  |
Allowance for credit losses on loans | $ 172,653,000 | $ 170,189,000 | $ 166,955,000 | $ 157,101,000 | $ 147,513,000 | $ 149,284,000
Loans in process | 1,982,225,000 |  | 1,456,072,000 |  |  |
Net deferred fees, costs and discounts | 75,287,000 |  | 52,378,000 |  |  |
Total loan contra accounts | 2,230,165,000 |  | 1,675,405,000 |  |  |
Net loans | 13,035,423,000 |  | 12,792,317,000 |  |  |
Commercial loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 9,387,560,000 |  | $ 8,163,029,000 |  |  |
Ratio of loan type to all loans | 61.50% |  | 56.30% |  |  |
Allowance for credit losses on loans | $ 125,444,000 | 119,207,000 | $ 109,923,000 | 98,704,000 | 89,581,000 | 89,335,000
Commercial loans | Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 2,008,192,000 |  | $ 1,538,762,000 |  |  |
Ratio of loan type to all loans | 13.20% |  | 10.60% |  |  |
Allowance for credit losses on loans | $ 17,776,000 | 14,363,000 | $ 13,853,000 | 11,742,000 | 10,506,000 | 10,404,000
Commercial loans | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 2,226,560,000 |  | $ 1,895,086,000 |  |  |
Ratio of loan type to all loans | 14.60% |  | 13.10% |  |  |
Allowance for credit losses on loans | $ 26,822,000 | 23,496,000 | $ 22,516,000 | 14,639,000 | 13,067,000 | 13,024,000
Commercial loans | Commercial & industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 2,471,823,000 |  | $ 2,132,160,000 |  |  |
Ratio of loan type to all loans | 16.20% |  | 14.70% |  |  |
Allowance for credit losses on loans | $ 47,794,000 | 44,317,000 | $ 38,665,000 | 38,576,000 | 33,676,000 | 32,235,000
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 711,405,000 |  | 762,004,000 |  |  |
Allowance for credit losses on loans | 0 |  | 0 |  |  |
Net loans | 695,752,000 |  | 745,081,000 |  |  |
Commercial loans | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 2,495,961,000 |  | $ 2,403,276,000 |  |  |
Ratio of loan type to all loans | 16.30% |  | 16.60% |  |  |
Allowance for credit losses on loans | $ 22,549,000 | 26,365,000 | $ 24,156,000 | 23,348,000 | 21,919,000 | 22,768,000
Commercial loans | Land - acquisition & development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 185,024,000 |  | $ 193,745,000 |  |  |
Ratio of loan type to all loans | 1.20% |  | 1.30% |  |  |
Allowance for credit losses on loans | $ 10,503,000 | 10,666,000 | $ 10,733,000 | 10,399,000 | 10,413,000 | 10,904,000
Consumer loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 5,878,028,000 |  | $ 6,304,693,000 |  |  |
Ratio of loan type to all loans | 38.50% |  | 43.70% |  |  |
Allowance for credit losses on loans | $ 47,209,000 | 50,982,000 | $ 57,032,000 | 58,397,000 | 57,932,000 | 59,949,000
Consumer loans | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 678,469,000 |  | $ 674,879,000 |  |  |
Ratio of loan type to all loans | 4.50% |  | 4.70% |  |  |
Allowance for credit losses on loans | $ 3,248,000 | 3,594,000 | $ 3,555,000 | 3,175,000 | 2,930,000 | 2,880,000
Consumer loans | Single-family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 4,828,535,000 |  | $ 5,304,689,000 |  |  |
Ratio of loan type to all loans | 31.60% |  | 36.70% |  |  |
Allowance for credit losses on loans | $ 35,108,000 | 38,613,000 | $ 45,186,000 | 46,816,000 | 46,356,000 | 47,771,000
Consumer loans | Land - consumer lot loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 123,351,000 |  | $ 102,263,000 |  |  |
Ratio of loan type to all loans | 0.80% |  | 0.70% |  |  |
Allowance for credit losses on loans | $ 3,292,000 | 2,958,000 | $ 2,729,000 | 2,578,000 | 2,567,000 | 2,635,000
Consumer loans | HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 144,528,000 |  | $ 139,703,000 |  |  |
Ratio of loan type to all loans | 0.90% |  | 1.00% |  |  |
Allowance for credit losses on loans | $ 2,226,000 | 2,362,000 | $ 2,571,000 | 2,246,000 | 2,034,000 | 2,048,000
Consumer loans | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 103,145,000 |  | $ 83,159,000 |  |  |
Ratio of loan type to all loans | 0.70% |  | 0.60% |  |  |
Allowance for credit losses on loans | $ 3,335,000 | $ 3,455,000 | $ 2,991,000 | $ 3,582,000 | $ 4,045,000 | $ 4,615,000

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