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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  | $ 14,301,358,000 |  |  | $ 13,312,388,000 |  |  |
Ratio of loan type to all loans |  | 100.00% |  |  | 100.00% |  |  |
Allowance for credit losses on loans |  | $ 165,349,000 | $ 157,101,000 | $ 147,513,000 | $ 131,534,000 | $ 134,022,000 | $ 133,086,000 | $ 129,257,000
Loans in process |  | 1,353,774,000 |  |  | 1,201,341,000 |  |  |
Net deferred fees, costs and discounts |  | 48,809,000 |  |  | 48,938,000 |  |  |
Total loan contra accounts |  | 1,567,932,000 |  |  | 1,381,813,000 |  |  |
Net loans | [1] | 12,733,426,000 |  |  | 11,930,575,000 |  |  |
Commercial loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  | $ 7,900,191,000 |  |  | $ 6,564,698,000 |  |  |
Ratio of loan type to all loans |  | 55.20% |  |  | 49.30% |  |  |
Allowance for credit losses on loans |  | $ 106,408,000 | 98,704,000 | 89,581,000 | $ 93,470,000 | 94,803,000 | 93,546,000 | 88,178,000
Commercial loans | Multi-family |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  | $ 1,510,099,000 |  |  | $ 1,422,674,000 |  |  |
Ratio of loan type to all loans |  | 10.60% |  |  | 10.70% |  |  |
Allowance for credit losses on loans |  | $ 12,088,000 | 11,742,000 | 10,506,000 | $ 7,391,000 | 7,283,000 | 7,394,000 | 8,329,000
Commercial loans | Commercial real estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  | $ 1,707,893,000 |  |  | $ 1,631,170,000 |  |  |
Ratio of loan type to all loans |  | 11.90% |  |  | 12.30% |  |  |
Allowance for credit losses on loans |  | $ 15,807,000 | 14,639,000 | 13,067,000 | $ 13,170,000 | 13,004,000 | 12,448,000 | 11,852,000
Commercial loans | Commercial & industrial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  | $ 2,158,000,000 |  |  | $ 1,268,695,000 |  |  |
Ratio of loan type to all loans |  | 15.10% |  |  | 9.50% |  |  |
Allowance for credit losses on loans |  | $ 42,179,000 | 38,576,000 | 33,676,000 | $ 31,450,000 | 31,071,000 | 30,574,000 | 28,702,000
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  | 758,955,000 |  |  |  |  |  |
Allowance for credit losses on loans |  | 0 |  |  |  |  |  |
Commercial loans | Construction |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  | $ 2,328,987,000 |  |  | $ 2,038,052,000 |  |  |
Ratio of loan type to all loans |  | 16.30% |  |  | 15.30% |  |  |
Allowance for credit losses on loans |  | $ 25,693,000 | 23,348,000 | 21,919,000 | $ 32,304,000 | 34,057,000 | 33,396,000 | 31,317,000
Commercial loans | Land - acquisition & development |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  | $ 195,212,000 |  |  | $ 204,107,000 |  |  |
Ratio of loan type to all loans |  | 1.40% |  |  | 1.50% |  |  |
Allowance for credit losses on loans |  | $ 10,641,000 | 10,399,000 | 10,413,000 | $ 9,155,000 | 9,388,000 | 9,734,000 | 7,978,000
Consumer loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  | $ 6,401,167,000 |  |  | $ 6,747,690,000 |  |  |
Ratio of loan type to all loans |  | 44.80% |  |  | 50.70% |  |  |
Allowance for credit losses on loans |  | $ 58,941,000 | 58,397,000 | 57,932,000 | $ 38,064,000 | 39,219,000 | 39,540,000 | 41,079,000
Consumer loans | Construction |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  | $ 607,329,000 |  |  | $ 540,741,000 |  |  |
Ratio of loan type to all loans |  | 4.20% |  |  | 4.10% |  |  |
Allowance for credit losses on loans |  | $ 3,336,000 | 3,175,000 | 2,930,000 | $ 1,369,000 | 1,884,000 | 1,976,000 | 1,842,000
Consumer loans | Single-family residential |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  | $ 5,461,605,000 |  |  | $ 5,835,194,000 |  |  |
Ratio of loan type to all loans |  | 38.20% |  |  | 43.80% |  |  |
Allowance for credit losses on loans |  | $ 47,149,000 | 46,817,000 | 46,356,000 | $ 30,988,000 | 31,514,000 | 31,476,000 | 33,033,000
Consumer loans | Land - consumer lot loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  | $ 100,102,000 |  |  | $ 99,694,000 |  |  |
Ratio of loan type to all loans |  | 0.70% |  |  | 0.70% |  |  |
Allowance for credit losses on loans |  | $ 2,671,000 | 2,578,000 | 2,567,000 | $ 2,143,000 | 2,032,000 | 2,076,000 | 2,164,000
Consumer loans | HELOC |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  | $ 140,636,000 |  |  | $ 142,178,000 |  |  |
Ratio of loan type to all loans |  | 1.00% |  |  | 1.10% |  |  |
Allowance for credit losses on loans |  | $ 2,588,000 | 2,246,000 | 2,034,000 | $ 1,103,000 | 1,087,000 | 1,082,000 | 781,000
Consumer loans | Consumer |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans |  | $ 91,495,000 |  |  | $ 129,883,000 |  |  |
Ratio of loan type to all loans |  | 0.60% |  |  | 1.00% |  |  |
Allowance for credit losses on loans |  | $ 3,197,000 | $ 3,581,000 | $ 4,045,000 | $ 2,461,000 | $ 2,702,000 | $ 2,930,000 | $ 3,259,000
[1] | Effective October 1, 2019, the Company has applied FASB ASU 2016-13, Financial Instruments - Credit Losses ("ASC 326"), so the allowance calculation is based on current expected credit loss methodology ("CECL"). Prior to October 1, 2019, the calculation was based on incurred loss methodology. See Note E "Allowance for Losses on Loans" for details.

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