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Loans Receivable - Troubled Debt Restructurings and Loan Modifications (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 USD ($) contract | Sep. 30, 2018 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 9 | 36
Pre-Modification, outstanding recorded investment | $ 1,265 | $ 13,131
Post-Modification, outstanding recorded investment | $ 1,265 | $ 13,131
TDRs that subsequently defaulted, number of contracts | contract | 7 | 5
TDRs that subsequently defaulted, recorded investment | $ 1,546 | $ 510
Single-family residential |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 8 | 27
Pre-Modification, outstanding recorded investment | $ 1,225 | $ 5,070
Post-Modification, outstanding recorded investment | $ 1,225 | $ 5,070
TDRs that subsequently defaulted, number of contracts | contract | 7 | 4
TDRs that subsequently defaulted, recorded investment | $ 1,546 | $ 433
Land - acquisition & development |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 0 | 1
Pre-Modification, outstanding recorded investment | $ 0 | $ 107
Post-Modification, outstanding recorded investment | $ 0 | $ 107
Land - consumer lot loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 1 | 0
Pre-Modification, outstanding recorded investment | $ 40 | $ 0
Post-Modification, outstanding recorded investment | $ 40 | $ 0
Commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 0 | 1
Pre-Modification, outstanding recorded investment | $ 0 | $ 120
Post-Modification, outstanding recorded investment | $ 0 | $ 120
Commercial & industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 0 | 4
Pre-Modification, outstanding recorded investment | $ 0 | $ 7,739
Post-Modification, outstanding recorded investment | $ 0 | $ 7,739
HELOC |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 0 | 2
Pre-Modification, outstanding recorded investment | $ 0 | $ 95
Post-Modification, outstanding recorded investment | $ 0 | $ 95
TDRs that subsequently defaulted, number of contracts | contract | 0 | 1
TDRs that subsequently defaulted, recorded investment | $ 0 | $ 77
Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 0 | 1
Pre-Modification, outstanding recorded investment | $ 0 | $ 0
Post-Modification, outstanding recorded investment | $ 0 | $ 0

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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