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Loans Receivable - Loans on Non-accrual Status (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual percent of total loans | 0.41% | 0.46%
Non-Accrual loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | $ 45,520 | $ 49,580
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 100.00% | 100.00%
Single-family residential | Non-Accrual loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | $ 26,219 | $ 27,930
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 57.70% | 56.30%
Construction | Non-Accrual loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | $ 364 | $ 0
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 0.80% | 0.00%
Construction - custom | Non-Accrual loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | $ 0 | $ 91
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 0.00% | 0.20%
Land - acquisition & development | Non-Accrual loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | $ 1,326 | $ 296
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 2.90% | 0.60%
Land - consumer lot loans | Non-Accrual loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | $ 976 | $ 605
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 2.10% | 1.20%
Multi-family | Non-Accrual loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | $ 250 | $ 139
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 0.50% | 0.30%
Commercial real estate | Non-Accrual loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | $ 8,241 | $ 11,815
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 18.10% | 23.80%
Commercial & industrial | Non-Accrual loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | $ 7,596 | $ 8,082
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 16.70% | 16.30%
HELOC | Non-Accrual loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | $ 476 | $ 531
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 1.00% | 1.10%
Consumer | Non-Accrual loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | $ 72 | $ 91
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 0.20% | 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://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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