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Securities - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Schedule of Trading Securities and Other Trading Assets [Line Items]
Proceeds from sales of securities available for sale				$ 0	$ 176,802,000
Gross realized gains from securities			$ 1,300,000	0	4,020,000
Gross realized losses from securities				0	0
Accrued interest on securities available for sale	$ 33,600,000			33,600,000		$ 45,800,000
Sales of securities held to maturity				0	0
Amortized cost of available for sale securities transferred to held to maturity	831,300,000	$ 3,000,000,000.0		831,300,000
Fair value of available for sale securities transferred to held to maturity	736,500,000	2,900,000,000		736,500,000
Gain (loss) on transfer of securities	0	$ 0
Unamortized unrealized loss				238,100,000
Accrued interest on securities held to maturity	21,600,000			21,600,000		5,300,000
Unrealized gain (loss) on trading securities				26,000	$ 1,000
Securities sold not yet purchased	1,300,000			1,300,000		3,200,000
Visa Inc. [Member] | Class B Common Shares [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Pre-tax gain on sale of common shares				66,200,000
Collateral Dependent Assets [Member] | U.S. Government and Other Public Deposit [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Pledged securities for deposits	9,800,000,000			9,800,000,000		10,200,000,000
Collateral Dependent Assets [Member] | Federal Reserve Discount Window [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Pledged securities for deposits	$ 140,700,000			$ 140,700,000		$ 171,200,000

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