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Loans Receivable - Schedule of Loans Receivable (including Covered Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 10,950,608 | $ 9,823,270 |
Ratio of type of loan to total loans receivable | 100.00% | 100.00% |
Allowance for probable losses | $ 113,494 | $ 106,829 | $ 114,591
Loans in process | 879,484 | 476,796 |
Discount on acquired loans | 11,306 | 30,095 |
Deferred net origination fees | 35,404 | 38,916 |
Total loan contra accounts | 1,039,688 | 652,636 |
Net Loans | 9,910,920 | 9,170,634 |
Single-family residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 5,658,827 |  |
Allowance for probable losses | 37,796 | 47,347 | 62,763
Construction - custom |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 473,069 |  |
Allowance for probable losses | 1,080 | 990 | 1,695
Land - acquisition & development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 118,497 |  |
Allowance for probable losses | 6,023 | 5,781 | 5,592
Land - consumer lot loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 104,568 |  |
Allowance for probable losses | 2,535 | 2,946 | 3,077
Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 1,124,289 |  |
Allowance for probable losses | 6,925 | 5,304 | 4,248
Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 1,093,639 |  |
Allowance for probable losses | 8,588 | 8,960 | 7,548
Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 978,589 |  |
Allowance for probable losses | 28,008 | 24,980 | 16,527
HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 149,717 |  |
Allowance for probable losses | 813 | 902 | 928
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 139,002 |  |
Allowance for probable losses | 1,888 | 2,939 | $ 3,227
Non-acquired loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 10,716,403 | $ 9,493,987 |
Ratio of type of loan to total loans receivable | 97.90% | 96.60% |
Non-acquired loans | Single-family residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 5,621,066 | $ 5,651,845 |
Ratio of type of loan to total loans receivable | 51.30% | 57.50% |
Non-acquired loans | Construction - speculative |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 1,110,411 | $ 200,509 |
Ratio of type of loan to total loans receivable | 10.10% | 2.00% |
Non-acquired loans | Construction - custom |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 473,069 | $ 396,307 |
Ratio of type of loan to total loans receivable | 4.30% | 4.00% |
Non-acquired loans | Land - acquisition & development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 116,156 | $ 94,208 |
Ratio of type of loan to total loans receivable | 1.10% | 1.00% |
Non-acquired loans | Land - consumer lot loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 101,853 | $ 103,989 |
Ratio of type of loan to total loans receivable | 0.90% | 1.10% |
Non-acquired loans | Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 1,118,801 | $ 1,125,722 |
Ratio of type of loan to total loans receivable | 10.20% | 11.50% |
Non-acquired loans | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 956,164 | $ 986,270 |
Ratio of type of loan to total loans receivable | 8.70% | 10.00% |
Non-acquired loans | Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 946,648 | $ 612,836 |
Ratio of type of loan to total loans receivable | 8.60% | 6.20% |
Non-acquired loans | HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 134,785 | $ 127,646 |
Ratio of type of loan to total loans receivable | 1.20% | 1.30% |
Non-acquired loans | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 137,450 | $ 194,655 |
Ratio of type of loan to total loans receivable | 1.30% | 2.00% |
Acquired loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 115,394 | $ 166,293 |
Ratio of type of loan to total loans receivable | 1.10% | 1.70% |
Credit-impaired acquired loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 89,837 | $ 87,081 |
Ratio of type of loan to total loans receivable | 0.80% | 0.90% |
Covered Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 28,974 | $ 75,909 |
Ratio of type of loan to total loans receivable | 0.30% | 0.80% |

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