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Loans Receivable - Loans on Non-accrual Status (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual percent of total loans | 0.44% | 0.49%
Non-accrual loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 51,450 | $ 55,686
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 | $ 24,748 | $ 27,643
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 48.10% | 49.60%
Non-accrual loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 1,380 | $ 2,427
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 2.70% | 4.40%
Non-accrual loans | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 438 | $ 920
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 0.90% | 1.70%
Non-accrual loans | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 785 | $ 787
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 1.50% | 1.40%
Non-accrual loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 9,478 | $ 8,971
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 18.40% | 16.10%
Non-accrual loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 13,995 | $ 14,394
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 27.20% | 25.80%
Non-accrual loans | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 599 | $ 523
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 1.20% | 0.90%
Non-accrual loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 27 | $ 21
Ratio of non-accrual loan by portfolio segment to total loans on non-accrual status | 0.10% | 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://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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