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Loans Receivable - Additional Information (Details) $ in Thousands |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) loan business | Mar. 31, 2021 USD ($) business | Dec. 31, 2020 USD ($) business | Sep. 30, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued interest receivable for loans | $ 48,676 | $ 48,676 |  | $ 48,704
Loans pledged to secure borrowings from the Federal Home Loan Bank | $ 6,314,864 | 6,314,864 |  | $ 5,361,504
Nonaccrual interest income recognized |  | 5,228 |  |
Impaired, interest income on accrual accrual and performed loans |  | $ 769 |  |
Number of businesses assisted, CARES Act | business | 2,000,000 | 2,000,000 | 6,500 |
Basis point reduction, minimum |  | 1.00% |  |
Basis point reduction, maximum |  | 2.00% |  |
Percent of TDRs classified as performing | 97.70% |  |  |
Single family residential loans as percentage of restructured loans | 92.60% | 92.60% |  |
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 |  | 24 months |  |
Performing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Troubled debt restructuring, amount | $ 78,282 |  |  |
SBA Payroll Protection Program, CARES Act |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amount of PPP loans authorized, CARES Act |  | $ 235,000 | $ 780,000 |
Consumer loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of loans modified | loan | 45 |  |  |
Total loans modified | $ 14,000 | 14,000 |  |
Commercial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of loans modified | loan | 10 |  |  |
Total loans modified | $ 89,000 | $ 89,000 |  |

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