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Loans Receivable - Loans on Non-accrual Status (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 55,686 | $ 49,580
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 100.00% | 100.00%
Non-accrual loans as % of total loans | 0.49% | 0.46%
Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 27,643 | $ 27,930
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 49.60% | 56.30%
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 2,427 | $ 0
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 4.40% | 0.00%
Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 0 | $ 91
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 0.00% | 0.20%
Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 920 | $ 296
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 1.70% | 0.60%
Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 787 | $ 605
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 1.40% | 1.20%
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 0 | $ 139
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 0.00% | 0.30%
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 8,971 | $ 11,815
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 16.10% | 23.80%
Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 14,394 | $ 8,082
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 25.80% | 16.30%
HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 523 | $ 531
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 0.90% | 1.10%
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 21 | $ 91
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual 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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