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Loans Receivable - Loan Modifications (Details) $ in Thousands | 3 Months Ended
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Dec. 31, 2015 USD ($) contract | Dec. 31, 2014 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |
Number of contracts (in contracts) | contract | 6 | 11
Recorded investment | $ | $ 816 | $ 1,820
Single-family residential |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts (in contracts) | contract | 5 | 8
Recorded investment | $ | $ 668 | $ 1,431
Land - consumer lot loans |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts (in contracts) | contract | 1 | 3
Recorded investment | $ | $ 148 | $ 389

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