Short-Term Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Secured Debt, Repurchase Agreements
Carrying amount of securities sold under repurchase agreements with customers	$ 259,800	$ 342,800
Carrying amount of the securities pledged to collateralize repurchase agreements	7,344,483	8,189,780
Federal funds purchased	253,486	213,597
Letter of credit outstanding	2,100
Loans	31,568,716	29,821,418
FRB Borrowings
Secured Debt, Repurchase Agreements
Debt Instrument Collateral Amount	1,900,000
Letter of credit outstanding	0	0
Maximum borrowing capacity	1,900,000
Loans	2,800,000
FHLB Advances [ Member ]
Secured Debt, Repurchase Agreements
Outstanding advances	0	0
Debt Instrument Collateral Amount	7,200,000
Amount of cash pledged as collateral	552,200
Unused net credit available with the FHLB	7,800,000
Debt Instrument Unused Borrowing Capacity Amount	7,800,000
Asset Pledged as Collateral [Member]
Secured Debt, Repurchase Agreements
Carrying amount of the securities pledged to collateralize repurchase agreements	$ 2,800,000	2,900,000
Asset Pledged as Collateral [Member] | FRB Borrowings
Secured Debt, Repurchase Agreements
Financing Receivable, Pledging Purpose [Extensible Enumeration]	Federal funds purchased
Asset Pledged as Collateral [Member] | FHLB Advances [ Member ]
Secured Debt, Repurchase Agreements
Debt Instrument Collateral Amount	$ 11,200,000
Amount of cash pledged as collateral	651,900
Asset Pledged as Collateral [Member] | Securities Sold under Agreements to Repurchase [Member]
Secured Debt, Repurchase Agreements
Carrying amount of the securities pledged to collateralize repurchase agreements	$ 404,300	$ 443,200