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Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands		6 Months Ended
	Feb. 08, 2021 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) branch	Mar. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)
Accounting Policies [Line Items]
Number of bank branches | branch		214
Dividend rate	4.875%
Proceeds from issuance of preferred stock, net		$ 0	$ 293,325
Cash collateral		153,000		$ 1,500
Loans in process		2,440,430		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		$ 4,295,025		$ 3,804,444

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Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.

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The percentage rate used to calculate dividend payments on preferred stock.

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Accounting Policies

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