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Loans Receivable - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 12,540,254 |  | $ 12,201,387 |  |  |
Ratio of type of loan to total loans receivable | 100.00% |  | 100.00% |  |  |
Allowance for loan losses | $ 127,576 | $ 127,155 | $ 123,073 | $ 121,922 | $ 118,456 | $ 113,494
Loans in process | 1,141,018 |  | 1,149,934 |  |  |
Net deferred fees, costs and discounts | 47,572 |  | 45,758 |  |  |
Total loan contra accounts | 1,316,166 |  | 1,318,765 |  |  |
Net loans | 11,224,088 |  | 10,882,622 |  |  |
Single-family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 5,705,350 |  | $ 5,711,004 |  |  |
Ratio of type of loan to total loans receivable | 45.50% |  | 46.80% |  |  |
Allowance for loan losses | $ 34,144 | 35,928 | $ 36,892 | 37,164 | 38,206 | 37,796
Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 1,732,202 |  | $ 1,597,996 |  |  |
Ratio of type of loan to total loans receivable | 13.80% |  | 13.10% |  |  |
Allowance for loan losses | $ 27,389 | 25,214 | $ 24,556 | 25,061 | 21,934 | 19,838
Construction - custom |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 597,671 |  | $ 602,631 |  |  |
Ratio of type of loan to total loans receivable | 4.80% |  | 4.90% |  |  |
Allowance for loan losses | $ 2,081 | 2,052 | $ 1,944 | 1,176 | 1,110 | 1,080
Land - acquisition & development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 141,628 |  | $ 124,308 |  |  |
Ratio of type of loan to total loans receivable | 1.10% |  | 1.00% |  |  |
Allowance for loan losses | $ 7,622 | 7,355 | $ 6,829 | 6,669 | 6,665 | 6,023
Land - consumer lot loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 102,779 |  | $ 104,405 |  |  |
Ratio of type of loan to total loans receivable | 0.80% |  | 0.90% |  |  |
Allowance for loan losses | $ 2,853 | 2,906 | $ 2,649 | 2,513 | 2,501 | 2,535
Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 1,328,049 |  | $ 1,303,148 |  |  |
Ratio of type of loan to total loans receivable | 10.60% |  | 10.70% |  |  |
Allowance for loan losses | $ 7,982 | 7,904 | $ 7,862 | 7,929 | 7,629 | 6,925
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 1,443,437 |  | $ 1,434,610 |  |  |
Ratio of type of loan to total loans receivable | 11.50% |  | 11.80% |  |  |
Allowance for loan losses | $ 11,588 | 11,625 | $ 11,818 | 10,772 | 10,168 | 8,588
Commercial & industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 1,151,108 |  | $ 1,093,360 |  |  |
Ratio of type of loan to total loans receivable | 9.20% |  | 9.00% |  |  |
Allowance for loan losses | $ 29,330 | 29,268 | $ 28,524 | 28,365 | 27,736 | 28,008
HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 135,119 |  | $ 144,850 |  |  |
Ratio of type of loan to total loans receivable | 1.10% |  | 1.20% |  |  |
Allowance for loan losses | $ 802 | 808 | $ 855 | 826 | 832 | 813
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 202,911 |  | $ 85,075 |  |  |
Ratio of type of loan to total loans receivable | 1.60% |  | 0.70% |  |  |
Allowance for loan losses | $ 3,785 | $ 4,095 | $ 1,144 | $ 1,447 | $ 1,675 | $ 1,888

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