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Borrowings (Additional Information) (Details) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2023	Sep. 30, 2023
Debt Instrument [Line Items]
Unpledged AFS securities		$ 24.9
Home Loan Bank
Debt Instrument [Line Items]
Subordinated Borrowing, Interest Rate	5.00%	4.87%
Subordinated Debt		$ 870.0
Other Short-Term Borrowings	$ 800.0	250.0
Secured and unused capacity		4,700.0
Bank Term Funding Program
Debt Instrument [Line Items]
Secured unused borrowing capacity		1,200.0
Unsecured Lines of Credit		300.0
Bank Term Funding Program | Minimum [Member]
Debt Instrument [Line Items]
Unpledged AFS securities		$ 260.0

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