Borrowings - Additional Information (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
FHLB advances maximum amount available	$ 4,600,000,000	$ 4,200,000,000
Federal Home Loan Bank Advances And Letters Of Credit Amount Used	300,000,000	400,000,000
Assets sold under agreements to repurchase	55,360,000	91,384,000
Other short-term borrowings	0	0
Advances with FRB
Debt Instrument [Line Items]
Line Of Credit Facility Current Borrowing Capacity	5,800,000,000	4,400,000,000
Federal Home Loan Bank
Debt Instrument [Line Items]
Federal Home Loan Bank Advances And Letters Of Credit Amount Used	$ 300,000,000	$ 300,000,000