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Loans Receivable - Narrative (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 USD ($) loan business | Sep. 30, 2020 USD ($) business
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued interest receivable for loans | $ 46,234 | $ 48,704
Loans pledged to secure borrowings from the Federal Home Loan Bank | $ 5,930,015 | $ 5,361,504
Number of businesses assisted, CARES Act | business | 2,500 | 6,500
Approximate rate reduction concession, minimum | 1.00% |
Approximate rate reduction concession, maximum | 2.00% |
TDRs that subsequently defaulted, recorded investment | $ 65,128 | $ 91,408
Percent of restructured loans performing | 97.70% |
Single family residential loans as percentage of restructured loans | 92.10% |
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 | $ 320,000 | 780,000
Number of PPP loans forgiven | loan | 7,000 |
Amount of PPP loans forgiven | $ 773,000 |
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 | $ 142,806 | $ 112,812
Consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of loans approved for deferrals, CARES Act | loan | 1,472 |
Number of contracts | loan | 18 |
Total loans modified | $ 5,600 |
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of loans approved for deferrals, CARES Act | loan | 221 |

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