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Loans Receivable - Loans on Non-accrual Status (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual percent of total loans | 0.53% | 0.46%
Non-accrual loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 60,584 | $ 49,580
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 100.00% | 100.00%
Non-accrual loans | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 26,119 | $ 27,930
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 43.10% | 56.30%
Non-accrual loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 1,841 | $ 0
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 3.00% | 0.00%
Non-accrual loans | Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 0 | $ 91
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 0.00% | 0.20%
Non-accrual loans | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 1,757 | $ 296
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 2.90% | 0.60%
Non-accrual loans | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 642 | $ 605
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 1.10% | 1.20%
Non-accrual loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 0 | $ 139
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 0.00% | 0.30%
Non-accrual loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 9,684 | $ 11,815
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 16.00% | 23.80%
Non-accrual loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 19,876 | $ 8,082
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 32.80% | 16.30%
Non-accrual loans | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 637 | $ 531
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 1.10% | 1.10%
Non-accrual loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 28 | $ 91
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 0.00% | 0.20%

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- Definition Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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