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Loans Receivable - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 13,434,649 |  | $ 13,312,388 |  |  |
Ratio of type of loan to total loans receivable | 100.00% |  | 100.00% |  |  |
Allowance for loan losses | $ 139,501 | $ 132,513 | $ 131,534 | $ 133,086 | $ 131,165 | $ 129,257
Loans in process | 1,289,812 |  | 1,201,341 |  |  |
Net deferred fees, costs and discounts | 31,095 |  | 48,938 |  |  |
Total loan contra accounts | 1,460,408 |  | 1,381,813 |  |  |
Net loans | 11,974,241 |  | 11,930,575 |  |  |
Single-family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 5,582,244 |  | $ 5,835,194 |  |  |
Ratio of type of loan to total loans receivable | 41.50% |  | 43.80% |  |  |
Allowance for loan losses | $ 29,280 | 30,700 | $ 30,988 | 31,476 | 31,484 | 33,033
Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 2,204,283 |  | $ 2,038,052 |  |  |
Ratio of type of loan to total loans receivable | 16.40% |  | 15.30% |  |  |
Allowance for loan losses | $ 34,283 | 32,292 | $ 32,304 | 33,396 | 31,463 | 31,317
Construction - custom |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 547,731 |  | $ 540,741 |  |  |
Ratio of type of loan to total loans receivable | 4.10% |  | 4.10% |  |  |
Allowance for loan losses | $ 1,580 | 1,399 | $ 1,369 | 1,976 | 1,926 | 1,842
Land - acquisition & development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 197,010 |  | $ 204,107 |  |  |
Ratio of type of loan to total loans receivable | 1.50% |  | 1.50% |  |  |
Allowance for loan losses | $ 8,733 | 8,746 | $ 9,155 | 9,734 | 9,156 | 7,978
Land - consumer lot loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 96,579 |  | $ 99,694 |  |  |
Ratio of type of loan to total loans receivable | 0.70% |  | 0.70% |  |  |
Allowance for loan losses | $ 2,106 | 2,090 | $ 2,143 | 2,076 | 2,144 | 2,164
Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 1,467,231 |  | $ 1,422,674 |  |  |
Ratio of type of loan to total loans receivable | 10.90% |  | 10.70% |  |  |
Allowance for loan losses | $ 8,567 | 7,404 | $ 7,391 | 7,394 | 7,884 | 8,329
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 1,717,535 |  | $ 1,631,170 |  |  |
Ratio of type of loan to total loans receivable | 12.80% |  | 12.30% |  |  |
Allowance for loan losses | $ 15,020 | 13,035 | $ 13,170 | 12,448 | 12,711 | 11,852
Commercial & industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 1,371,128 |  | $ 1,268,695 |  |  |
Ratio of type of loan to total loans receivable | 10.20% |  | 9.50% |  |  |
Allowance for loan losses | $ 36,435 | 33,540 | $ 31,450 | 30,574 | 30,279 | 28,702
HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 145,761 |  | $ 142,178 |  |  |
Ratio of type of loan to total loans receivable | 1.10% |  | 1.10% |  |  |
Allowance for loan losses | $ 1,282 | 1,104 | $ 1,103 | 1,082 | 1,064 | 781
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 105,147 |  | $ 129,883 |  |  |
Ratio of type of loan to total loans receivable | 0.80% |  | 1.00% |  |  |
Allowance for loan losses | $ 2,215 | $ 2,203 | $ 2,461 | $ 2,930 | $ 3,054 | $ 3,259

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