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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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