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Loans Receivable - Loans on Non-accrual Status (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 49,580 | $ 42,414
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 100.00% | 100.00%
Nonaccrual, percent of total loans | 0.43% | 0.46%
Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 27,930 | $ 33,148
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 56.30% | 78.20%
Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 91 | $ 0
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 0.20% | 0.00%
Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 296 | $ 58
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 0.60% | 0.10%
Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 605 | $ 510
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 1.20% | 1.20%
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 139 | $ 776
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 0.30% | 1.80%
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 11,815 | $ 7,100
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 23.80% | 16.70%
Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 8,082 | $ 583
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 16.30% | 1.40%
HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 531 | $ 239
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 1.10% | 0.60%
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 91 | $ 0
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 0.20% | 0.00%

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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://www.xbrl.org/2003/role/presentationRef -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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