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Loans Receivable - Narrative (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) loan branch | Sep. 30, 2020 USD ($) branch | Sep. 30, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accrued interest receivable for loans | $ 48,704 | $ 48,704 | $ 41,429
Loans pledged to secure borrowings from the Federal Home Loan Bank | $ 5,361,504 | $ 5,361,504 | 5,874,704
Number of businesses assisted, CARES Act | branch | 6,500 | 6,500 |
Approximate rate reduction concession, minimum |  | 1.00% |
Approximate rate reduction concession, maximum |  | 2.00% |
TDRs that subsequently defaulted, recorded investment | $ 91,408 | $ 91,408 | 121,677
Percent of restructured loans performing | 97.40% | 97.40% |
Single family residential loans as percentage of restructured loans | 93.60% | 93.60% |
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 |
SBA Payroll Protection Program, CARES Act |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount of PPP loans authorized, CARES Act |  | $ 780,000 |
Financing Receivable from Related Party Including Unfunded Loan Commitment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans granted to officers, directors, and related interests |  | 112,812 | $ 76,288
Consumer loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of contracts | loan | 612 |  |
Total loans modified | $ 171,000 | 171,000 |
Commercial loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of contracts | loan | 69 |  |
Total loans modified | $ 167,000 | $ 167,000 |

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