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Loans Receivable - Troubled Debt Restructurings and Loan Modifications (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2016 USD ($) contract | Sep. 30, 2015 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |
Approximate rate reduction concession, minimum | 1.00% |
Approximate rate reduction concession, maximum | 2.00% |
TDRs included in impaired loans | $ 261,531 | $ 302,713
Percent of restructured loans performing | 96.20% |
Single family residential loans as percentage of restructured loans | 87.20% |
Number of contracts | contract | 139 | 78
Pre-modification, outstanding recorded investment | $ 27,184 | $ 18,930
Post-modification, outstanding recorded investment | $ 27,184 | $ 18,930
Subsequent default, number of contracts | contract | 25 | 20
Subsequent default, recorded investment | $ 6,086 | $ 3,218
Single-family residential |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 120 | 62
Pre-modification, outstanding recorded investment | $ 23,541 | $ 13,378
Post-modification, outstanding recorded investment | $ 23,541 | $ 13,378
Subsequent default, number of contracts | contract | 17 | 18
Subsequent default, recorded investment | $ 4,875 | $ 2,917
Construction |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 0 | 2
Pre-modification, outstanding recorded investment | $ 0 | $ 701
Post-modification, outstanding recorded investment | $ 0 | $ 701
Subsequent default, number of contracts | contract | 1 | 0
Subsequent default, recorded investment | $ 279 | $ 0
Land - consumer lot loans |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 10 | 9
Pre-modification, outstanding recorded investment | $ 970 | $ 1,546
Post-modification, outstanding recorded investment | $ 970 | $ 1,546
Subsequent default, number of contracts | contract | 5 | 2
Subsequent default, recorded investment | $ 606 | $ 301
Commercial real estate |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 7 | 3
Pre-modification, outstanding recorded investment | $ 2,523 | $ 3,175
Post-modification, outstanding recorded investment | $ 2,523 | $ 3,175
Subsequent default, number of contracts | contract | 2 | 0
Subsequent default, recorded investment | $ 326 | $ 0
HELOC |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 1 | 1
Pre-modification, outstanding recorded investment | $ 126 | $ 50
Post-modification, outstanding recorded investment | $ 126 | $ 50
Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 1 | 1
Pre-modification, outstanding recorded investment | $ 24 | $ 80
Post-modification, outstanding recorded investment | $ 24 | $ 80
Minimum |  |
Financing Receivable, Modifications [Line Items] |  |
Term for payment and rate reduction | 6 months |
Maximum |  |
Financing Receivable, Modifications [Line Items] |  |
Term for payment and rate reduction | 12 months |

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