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Loans Receivable - Loan Modifications (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) contract | Mar. 31, 2016 USD ($) contract | Mar. 31, 2017 USD ($) contract | Mar. 31, 2016 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts (in contracts) | contract | 7 | 8 | 15 | 10
Recorded investment | $ | $ 1,192 | $ 1,169 | $ 3,452 | $ 1,393
Single-family residential |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts (in contracts) | contract | 7 | 6 | 13 | 8
Recorded investment | $ | $ 1,192 | $ 871 | $ 3,185 | $ 1,095
Land - consumer lot loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts (in contracts) | contract | 0 | 1 | 0 | 1
Recorded investment | $ | $ 0 | $ 146 | $ 0 | $ 146
Commercial real estate |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts (in contracts) | contract | 0 | 1 | 2 | 1
Recorded investment | $ | $ 0 | $ 152 | $ 267 | $ 152

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