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Loans Receivable - Breakdown of Delinquent Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Charge Offs and Loans in Process | $ 11,051,453 |
Recorded investment, current | 11,007,440 |
Recorded investment, past due | $ 44,013 |
Ratio of total past due loans to total loans | 0.40% | 0.68%
Delinquency %, current | 99.60% |
Delinquency %, past due | 0.40% |
Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Charge Offs and Loans in Process | $ 5,709,690 |
Recorded investment, current | 5,671,933 |
Recorded investment, past due | $ 37,757 |
Ratio of total past due loans to total loans | 0.66% |
Construction - speculative |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Charge Offs and Loans in Process | $ 793,959 |
Recorded investment, current | 793,959 |
Recorded investment, past due | $ 0 |
Ratio of total past due loans to total loans | 0.00% |
Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Charge Offs and Loans in Process | $ 277,599 |
Recorded investment, current | 277,508 |
Recorded investment, past due | $ 91 |
Ratio of total past due loans to total loans | 0.03% |
Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Charge Offs and Loans in Process | $ 104,856 |
Recorded investment, current | 104,526 |
Recorded investment, past due | $ 330 |
Ratio of total past due loans to total loans | 0.31% |
Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Charge Offs and Loans in Process | $ 104,335 |
Recorded investment, current | 103,389 |
Recorded investment, past due | $ 946 |
Ratio of total past due loans to total loans | 0.91% |
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Charge Offs and Loans in Process | $ 1,303,119 |
Recorded investment, current | 1,302,720 |
Recorded investment, past due | $ 399 |
Ratio of total past due loans to total loans | 0.03% |
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Charge Offs and Loans in Process | $ 1,434,610 |
Recorded investment, current | 1,432,052 |
Recorded investment, past due | $ 2,558 |
Ratio of total past due loans to total loans | 0.18% |
Commercial and Industrial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Charge Offs and Loans in Process | $ 1,093,360 |
Recorded investment, current | 1,092,735 |
Recorded investment, past due | $ 625 |
Ratio of total past due loans to total loans | 0.06% |
HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Charge Offs and Loans in Process | $ 144,850 |
Recorded investment, current | 143,974 |
Recorded investment, past due | $ 876 |
Ratio of total past due loans to total loans | 0.60% |
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Net of Charge Offs and Loans in Process | $ 85,075 |
Recorded investment, current | 84,644 |
Recorded investment, past due | $ 431 |
Ratio of total past due loans to total loans | 0.51% |
30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | $ 12,015 |
Delinquency %, past due | 0.11% |
30 Days Delinquent | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | $ 10,925 |
30 Days Delinquent | Construction - speculative |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 0 |
30 Days Delinquent | Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 0 |
30 Days Delinquent | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 0 |
30 Days Delinquent | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 112 |
30 Days Delinquent | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 5 |
30 Days Delinquent | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 507 |
30 Days Delinquent | Commercial and Industrial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 0 |
30 Days Delinquent | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 221 |
30 Days Delinquent | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 245 |
60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | $ 6,245 |
Delinquency %, past due | 0.06% |
60 Days Delinquent | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | $ 4,810 |
60 Days Delinquent | Construction - speculative |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 0 |
60 Days Delinquent | Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 0 |
60 Days Delinquent | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 0 |
60 Days Delinquent | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 680 |
60 Days Delinquent | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 255 |
60 Days Delinquent | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 0 |
60 Days Delinquent | Commercial and Industrial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 51 |
60 Days Delinquent | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 342 |
60 Days Delinquent | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 107 |
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | $ 25,753 |
Delinquency %, past due | 0.23% |
90 Days Delinquent | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | $ 22,022 |
90 Days Delinquent | Construction - speculative |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 0 |
90 Days Delinquent | Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 91 |
90 Days Delinquent | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 330 |
90 Days Delinquent | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 154 |
90 Days Delinquent | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 139 |
90 Days Delinquent | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 2,051 |
90 Days Delinquent | Commercial and Industrial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 574 |
90 Days Delinquent | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | 313 |
90 Days Delinquent | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, past due | $ 79 |

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