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Loans Receivable - Troubled Debt Restructurings and Loan Modifications (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 USD ($) contract | Sep. 30, 2016 USD ($) 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 | $ 207,377 | $ 261,531
Percent of restructured loans performing | 97.50% |
Single family residential loans as percentage of restructured loans | 87.70% |
Number of contracts | contract | 44 | 139
Pre-modification, outstanding recorded investment | $ 7,878 | $ 27,184
Post-modification, outstanding recorded investment | $ 7,878 | $ 27,184
Subsequent default, number of contracts | contract | 26 | 25
Subsequent default, recorded investment | $ 4,481 | $ 6,086
Single-family residential |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 38 | 120
Pre-modification, outstanding recorded investment | $ 7,115 | $ 23,541
Post-modification, outstanding recorded investment | $ 7,115 | $ 23,541
Subsequent default, number of contracts | contract | 24 | 17
Subsequent default, recorded investment | $ 4,214 | $ 4,875
Construction |  |
Financing Receivable, Modifications [Line Items] |  |
Subsequent default, number of contracts | contract | 0 | 1
Subsequent default, recorded investment | $ 0 | $ 279
Land - consumer lot loans |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 2 | 10
Pre-modification, outstanding recorded investment | $ 211 | $ 970
Post-modification, outstanding recorded investment | $ 211 | $ 970
Subsequent default, number of contracts | contract | 0 | 5
Subsequent default, recorded investment | $ 0 | $ 606
Commercial real estate |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 0 | 7
Pre-modification, outstanding recorded investment | $ 0 | $ 2,523
Post-modification, outstanding recorded investment | $ 0 | $ 2,523
Subsequent default, number of contracts | contract | 2 | 2
Subsequent default, recorded investment | $ 267 | $ 326
HELOC |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 4 | 1
Pre-modification, outstanding recorded investment | $ 552 | $ 126
Post-modification, outstanding recorded investment | $ 552 | $ 126
Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 0 | 1
Pre-modification, outstanding recorded investment | $ 0 | $ 24
Post-modification, outstanding recorded investment | $ 0 | $ 24
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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