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v3.23.3

Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 08, 2021 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) payment segment branch | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Oct. 27, 2020 USD ($) | Oct. 09, 2013 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of offices | branch |  | 198 |  |  |  |
Dividend rate | 4.875% |  |  |  |  |
Proceeds from issuance of preferred stock, net | $ 293,325 | $ 0 | $ 0 | $ 293,325 |  |
Cash collateral |  | 326,750 | $ 284,400 |  |  |
Fair value of NAV |  | 37,587 |  |  |  |
Remaining unfunded commitment |  | $ 6,039 |  |  |  |
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 |  |  |  |
Weighted average remaining contractual term, exercisable |  | 7 years |  |  |  |
Number of reportable business segments | segment |  | 1 |  |  |  |
Civil money penalty from consent order issued |  |  |  |  | $ 200 | $ 34
Minimum |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Term for payment and rate reduction |  | 6 months |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |  |
Minimum | Stock Options and Restricted Stock |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  | 2 years |  |  |  |
Maximum |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Term for payment and rate reduction |  | 12 months |  |  |  |
Award vesting period (in years) |  | 5 years |  |  |  |
Weighted average remaining contractual term, exercisable |  | 10 years |  |  |  |
Maximum | Stock Options and Restricted Stock |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  | 5 years |  |  |  |
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 |  |  |  |  |

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