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Loans Receivable - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Ratio of total past due loans to total loans |  | 0.42% | 0.40%
Approximate rate reduction concession, minimum |  | 1.00% |
Approximate rate reduction concession, maximum |  | 2.00% |
TDRs included in impaired loans |  | $ 156,858 | $ 207,377
Percent of restructured loans performing |  | 96.10% |
Single family residential loans as percentage of restructured loans |  | 89.10% |
Payments to settle FDIC clawback liability | $ 39,900 |  |
Loans Receivable from Related Party Including Unfunded Loan Commitment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans granted to officers, directors, and related interests |  | $ 70,012 | $ 84,166
Minimum |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Term for payment and rate reduction |  | 6 months |
Maximum |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Term for payment and rate reduction |  | 12 months |

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