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Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 08, 2021 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) portfolioSegment classOfPortfolioSegment branch | Sep. 30, 2023 USD ($)
Accounting Policies [Line Items] |  |  |
Number of bank branches | branch |  | 198 |
Dividend rate | 4.875% |  |
Proceeds from issuance of preferred stock, net | $ 293,325 |  |
Cash collateral |  | $ 229,100 | $ 326,750
Fair value of NAV |  | 36,708 |
Remaining unfunded commitment |  | $ 5,578 |
Number of portfolio segments for loans held for investment | portfolioSegment |  | 2 |
Number of classes disaggregating the commercial loan portfolio | classOfPortfolioSegment |  | 5 |
Number of classes disaggregating the consumer loan portfolio | classOfPortfolioSegment |  | 5 |
Loans in process |  | $ 1,516,522 | 1,895,940
Financing Receivable |  |  |
Accounting Policies [Line Items] |  |  |
Loans in process |  | $ 3,180,001 | $ 3,625,333
Public Offering |  |  |
Accounting Policies [Line Items] |  |  |
Number of depositary 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 |  |  |
Accounting Policies [Line Items] |  |  |
Number of depositary shares | shares | 300,000 |  |

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