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Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Feb. 08, 2021 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) portfolioSegment branch classOfPortfolioSegment | Sep. 30, 2022 USD ($)
Accounting Policies [Line Items] |  |  |
Number of bank branches | branch |  | 199 |
Dividend rate | 4.875% |  |
Cash collateral |  | $ (285,600) | $ (284,400)
Equity method investments |  | 35,088 |
Unfunded commitment |  | $ 8,273 |
Number of portfolio segments | portfolioSegment |  | 2 |
Loans in process |  | $ 2,270,038 | 3,006,023
Financing Receivable |  |  |
Accounting Policies [Line Items] |  |  |
Loans in process |  | $ 4,088,046 | $ 4,947,570
Commercial loans |  |  |
Accounting Policies [Line Items] |  |  |
Number of segment classes | classOfPortfolioSegment |  | 5 |
Public Offering |  |  |
Accounting Policies [Line Items] |  |  |
Number of depositary shares (in shares) | shares | 12,000,000 |  |
Proceeds from issuance of preferred stock, net | $ 293,325 |  |
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 (in shares) | shares | 300,000 |  |

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