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Summary of Significant Accounting Policies - Narrative (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 08, 2021 $ / shares shares | Sep. 30, 2021 USD ($) payment branch segment | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Oct. 27, 2020 USD ($) | Oct. 09, 2013 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of offices | branch |  | 219 |  |  |  |
Dividend rate | 4.875% |  |  |  |  |
Proceeds from issuance of preferred stock, net |  | $ 293,325,000 | $ 0 | $ 0 |  |
Cash collateral |  | $ 1,500,000 | $ 97,600,000 |  |  |
Days past grace period to initiate contact to cure deficiency |  | 30 days |  |  |  |
Minimum days past due to begin foreclosure proceedings |  | 90 days |  |  |  |
Approximate rate reduction concession, minimum |  | 1.00% |  |  |  |
Approximate rate reduction concession, maximum |  | 2.00% |  |  |  |
Minimum days past due to stop accrual of interest |  | 90 days |  |  |  |
Loans returned to full accrual status |  | 90 days |  |  |  |
Number of payments required | payment |  | 6 |  |  |  |
Number of reportable business segments | segment |  | 1 |  |  |  |
Civil money penalty from consent order issued |  | $ 2,500,000 |  |  | $ 200,000 | $ 34,000
Public Offering |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of shares issued in transaction (in shares) | shares | 12,000,000 |  |  |  |  |
Percentage of preferred stock | 2.50% |  |  |  |  |
Public offering price (in usd per share) | $ / shares | $ 25.00 |  |  |  |  |
Series A Preferred Stock | Public Offering |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of shares issued in transaction (in shares) | shares | 300,000 |  |  |  |  |
Minimum |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Term for payment and rate reduction |  | 6 months |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |  |
Maximum |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Term for payment and rate reduction |  | 12 months |  |  |  |
Award vesting period (in years) |  | 5 years |  |  |  |
Options exercisable, weighted average remaining contractual term (in years) |  | 10 years |  |  |  |
Stock Options and Restricted Stock | Minimum |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  | 2 years |  |  |  |
Stock Options and Restricted Stock | Maximum |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  | 5 years |  |  |  |

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