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Loans Receivable - Troubled Debt Restructurings and Loan Modifications (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 USD ($) contract | Sep. 30, 2017 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 36 | 44
Pre-Modification, Outstanding Recorded Investment | $ 13,131 | $ 7,878
Post-Modification, Outstanding Recorded Investment | $ 13,131 | $ 7,878
TDRs That Subsequently Defaulted, Number of Contracts | contract | 5 | 26
TDRs That Subsequently Defaulted, Recorded Investment | $ 510 | $ 4,481
Single-family residential |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 27 | 38
Pre-Modification, Outstanding Recorded Investment | $ 5,070 | $ 7,115
Post-Modification, Outstanding Recorded Investment | $ 5,070 | $ 7,115
TDRs That Subsequently Defaulted, Number of Contracts | contract | 4 | 24
TDRs That Subsequently Defaulted, Recorded Investment | $ 433 | $ 4,214
Land - acquisition & development |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 1 | 0
Pre-Modification, Outstanding Recorded Investment | $ 107 | $ 0
Post-Modification, Outstanding Recorded Investment | $ 107 | $ 0
Land - consumer lot loans |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 0 | 2
Pre-Modification, Outstanding Recorded Investment | $ 0 | $ 211
Post-Modification, Outstanding Recorded Investment | $ 0 | $ 211
Commercial real estate |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 1 | 0
Pre-Modification, Outstanding Recorded Investment | $ 120 | $ 0
Post-Modification, Outstanding Recorded Investment | $ 120 | $ 0
TDRs That Subsequently Defaulted, Number of Contracts | contract | 0 | 2
TDRs That Subsequently Defaulted, Recorded Investment | $ 0 | $ 267
Commercial & industrial |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 4 | 0
Pre-Modification, Outstanding Recorded Investment | $ 7,739 | $ 0
Post-Modification, Outstanding Recorded Investment | $ 7,739 | $ 0
HELOC |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 2 | 4
Pre-Modification, Outstanding Recorded Investment | $ 95 | $ 552
Post-Modification, Outstanding Recorded Investment | $ 95 | $ 552
TDRs That Subsequently Defaulted, Number of Contracts | contract | 1 | 0
TDRs That Subsequently Defaulted, Recorded Investment | $ 77 | $ 0
Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | contract | 1 | 0
Pre-Modification, Outstanding Recorded Investment | $ 0 | $ 0
Post-Modification, Outstanding Recorded Investment | $ 0 | $ 0

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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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