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Loans Receivable - Schedule of Loans Receivable (including Covered Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 12,201,387 | $ 10,950,608 |
Ratio of type of loan to total loans receivable | 100.00% | 100.00% |
Allowance for probable losses | $ 123,073 | $ 113,494 | $ 106,829
Loans in process | 1,149,934 | 879,484 |
Net deferred fees, costs and discounts | 45,758 | 46,710 |
Total loan contra accounts | 1,318,765 | 1,039,688 |
Net loans | 10,882,622 | 9,910,920 |
Single-family residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 5,711,004 | $ 5,658,830 |
Ratio of type of loan to total loans receivable | 46.80% | 51.70% |
Allowance for probable losses | $ 36,892 | $ 37,796 | 47,347
Construction - speculative |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 1,597,996 | $ 1,110,411 |
Ratio of type of loan to total loans receivable | 13.10% | 10.10% |
Construction - custom |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 602,631 | $ 473,069 |
Ratio of type of loan to total loans receivable | 4.90% | 4.30% |
Allowance for probable losses | $ 1,944 | $ 1,080 | 990
Land - acquisition & development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 124,308 | $ 118,497 |
Ratio of type of loan to total loans receivable | 1.00% | 1.10% |
Allowance for probable losses | $ 6,829 | $ 6,023 | 5,781
Land - consumer lot loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 104,405 | $ 104,567 |
Ratio of type of loan to total loans receivable | 0.90% | 1.00% |
Allowance for probable losses | $ 2,649 | $ 2,535 | 2,946
Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 1,303,148 | $ 1,124,290 |
Ratio of type of loan to total loans receivable | 10.70% | 10.30% |
Allowance for probable losses | $ 7,862 | $ 6,925 | 5,304
Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 1,434,610 | $ 1,093,639 |
Ratio of type of loan to total loans receivable | 11.80% | 10.00% |
Allowance for probable losses | $ 11,818 | $ 8,588 | 8,960
Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 1,093,360 | $ 978,589 |
Ratio of type of loan to total loans receivable | 9.00% | 8.90% |
Allowance for probable losses | $ 28,524 | $ 28,008 | 24,980
HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 144,850 | $ 149,716 |
Ratio of type of loan to total loans receivable | 1.20% | 1.40% |
Allowance for probable losses | $ 855 | $ 813 | 902
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 85,075 | $ 139,000 |
Ratio of type of loan to total loans receivable | 0.70% | 1.30% |
Allowance for probable losses | $ 1,144 | $ 1,888 | $ 2,939

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