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Loans Receivable - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 10,110,184 | $ 9,823,270 |
Ratio of type of loan to total loans receivable | 100.00% | 100.00% |
Allowance for probable losses | $ 107,901 | $ 106,829 | $ 114,591
Loans in process | 535,850 | 476,796 |
Discount on acquired loans | 25,040 | 30,095 |
Deferred net origination fees | 38,663 | 38,916 |
Charges against loans receivable | 707,454 | 652,636 |
Loans receivable, net | 9,402,730 | 9,170,634 |
Single-family residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for probable losses | 47,756 | 47,347 | 62,763
Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for probable losses | 7,014 | 6,680 | 6,742
Construction - custom |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for probable losses | 1,062 | 990 | 1,695
Land - acquisition & development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for probable losses | 6,778 | 5,781 | 5,592
Land - consumer lot loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for probable losses | 3,001 | 2,946 | 3,077
Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for probable losses | 5,047 | 5,304 | 4,248
Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for probable losses | 10,344 | 8,960 | 7,548
Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for probable losses | 24,096 | 24,980 | 16,527
HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for probable losses | 820 | 902 | 928
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for probable losses | 1,983 | 2,939 | $ 3,227
Non-Acquired loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 9,791,190 | $ 9,493,987 |
Ratio of type of loan to total loans receivable | 96.90% | 96.60% |
Non-Acquired loans | Single-family residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 5,629,715 | $ 5,651,845 |
Ratio of type of loan to total loans receivable | 55.70% | 57.50% |
Non-Acquired loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 660,238 | $ 200,509 |
Ratio of type of loan to total loans receivable | 6.50% | 2.00% |
Non-Acquired loans | Construction - custom |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 404,849 | $ 396,307 |
Ratio of type of loan to total loans receivable | 4.00% | 4.00% |
Non-Acquired loans | Land - acquisition & development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 97,025 | $ 94,208 |
Ratio of type of loan to total loans receivable | 1.00% | 1.00% |
Non-Acquired loans | Land - consumer lot loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 102,376 | $ 103,989 |
Ratio of type of loan to total loans receivable | 1.00% | 1.10% |
Non-Acquired loans | Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 997,696 | $ 1,125,722 |
Ratio of type of loan to total loans receivable | 9.90% | 11.50% |
Non-Acquired loans | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 839,157 | $ 986,270 |
Ratio of type of loan to total loans receivable | 8.30% | 10.00% |
Non-Acquired loans | Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 751,073 | $ 612,836 |
Ratio of type of loan to total loans receivable | 7.40% | 6.20% |
Non-Acquired loans | HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 127,919 | $ 127,646 |
Ratio of type of loan to total loans receivable | 1.30% | 1.30% |
Non-Acquired loans | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 181,142 | $ 194,655 |
Ratio of type of loan to total loans receivable | 1.80% | 2.00% |
Acquired loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 164,380 | $ 166,293 |
Ratio of type of loan to total loans receivable | 1.60% | 1.70% |
Credit impaired acquired loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 116,030 | $ 87,081 |
Ratio of type of loan to total loans receivable | 1.10% | 0.90% |
Covered loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 38,584 | $ 75,909 |
Ratio of type of loan to total loans receivable | 0.40% | 0.80% |

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