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Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 11, 2022 USD ($) $ / shares | Feb. 08, 2021 $ / shares shares | Sep. 30, 2022 USD ($) payment segment branch | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) | Oct. 27, 2020 USD ($) | Oct. 09, 2013 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of offices | branch |  |  | 201 |  |  |  |  |
Dividend rate |  | 4.875% |  |  |  |  |  |
Proceeds from issuance of preferred stock, net |  |  | $ 0 | $ 293,325 | $ 0 |  |  |
Cash collateral |  |  | 284,400 | $ 1,500 |  |  |  |
Fair value of NAV |  |  | 41,476 |  |  |  |  |
Remaining unfunded commitment |  |  | $ 7,511 |  |  |  |  |
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 |  |  |  |  |
Options exercisable, weighted average remaining contractual term (in years) |  |  | 6 years |  |  |  |  |
Number of reportable business segments | segment |  |  | 1 |  |  |  |  |
Civil money penalty from consent order issued |  |  |  |  |  | $ 2,500 | $ 200 | $ 34
Subsequent Event |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Common stock transaction value | $ 654,000 |  |  |  |  |  |  |
Number of shares issued in transaction, price per share (in dollars per share) | $ / shares | $ 0.3353 |  |  |  |  |  |  |
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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