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Loans Receivable - Loan Modifications (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) contract | Mar. 31, 2015 USD ($) contract | Mar. 31, 2016 USD ($) contract | Mar. 31, 2015 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts (in contracts) | contract | 8 | 4 | 10 | 10
Recorded investment | $ | $ 1,169 | $ 605 | $ 1,393 | $ 1,626
Single-family residential |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts (in contracts) | contract | 6 | 2 | 8 | 7
Recorded investment | $ | $ 871 | $ 304 | $ 1,095 | $ 1,237
Land - consumer lot loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts (in contracts) | contract | 1 | 2 | 1 | 3
Recorded investment | $ | $ 146 | $ 301 | $ 146 | $ 389
Commercial real estate |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts (in contracts) | contract | 1 | 0 | 1 | 0
Recorded investment | $ | $ 152 | $ 0 | $ 152 | $ 0

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