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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, 2022 USD ($) branch | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($)
Accounting Policies [Line Items] |  |  |  |
Number of bank branches | branch |  | 209 |  |
Dividend rate | 4.875% |  |  |
Proceeds from issuance of preferred stock, net |  | $ 0 | $ 293,325 |
Cash collateral |  | 219,650 |  | $ 1,500
Loans in process |  | 3,083,573 |  | 2,232,836
Public Offering |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Number of depositary shares | shares | 12,000,000 |  |  |
Proceeds from issuance of preferred stock, net | $ 293,325 |  |  |
Public offering price (in usd per share) | $ / shares | $ 25.00 |  |  |
Percentage of preferred stock | 2.50% |  |  |
Public Offering | Series A Preferred Stock |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Number of depositary shares | shares | 300,000 |  |  |
Financing Receivable |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Loans in process |  | $ 4,973,336 |  | $ 3,804,444

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