Contractual interest rate for funds borrowed, under the debt agreement.

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Long-Term Borrowings (Details) - USD ($)		3 Months Ended	6 Months Ended
Long-Term Borrowings (Details) - USD ($)	Mar. 16, 2022	Mar. 31, 2021	Jun. 30, 2021	Mar. 30, 2022
Debt Instrument [Line Items]
Debt extinguishment costs			$ 800,000
Payments of FHLBank Borrowings, Financing Activities		$ 536,000,000
Prepayment Fees on Advances, Net		$ 20,900,000
Senior Notes
Debt Instrument [Line Items]
Debt instrument, repurchase amount				$ 60,000,000
Senior Notes \| 3.60% Senior Notes
Debt Instrument [Line Items]
Repayments of senior debt	$ 65,000,000
Debt instrument, interest rate (as a percent)	3.60%
Subordinated Debt \| November 2024 Subordinated Debt
Debt Instrument [Line Items]
Debt instrument, repurchase amount				$ 75,000,000
Debt extinguishment costs			$ 11,300,000