Borrowings - Additional Information (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument
FHLB advances maximum amount available	$ 4,700,000,000	$ 4,200,000,000
Federal Home Loan Bank Advances And Letters Of Credit Amount Used	500,000,000	400,000,000
Assets sold under agreements to repurchase	54,833,000	91,384,000
Other short-term borrowings	225,000,000	0
Advances with FRB
Debt Instrument
Line Of Credit Facility Current Borrowing Capacity	7,000,000,000.0	4,400,000,000
Federal Home Loan Bank
Debt Instrument
Federal Home Loan Bank Advances And Letters Of Credit Amount Used	300,000,000	300,000,000
Other short-term borrowings	$ 225,000,000	$ 0