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Securities - Additional Information (Detail) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2022
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Proceeds from sales of securities available for sale | $ 51,771,000 | $ 611,423,000 |  |
Fair Value | 13,660,886,000 |  | $ 13,709,141,000 |
Gross realized gains from securities | 403,000 | 390,000 |  |
Accrued interest on securities available for sale | 74,500,000 |  | 82,900,000 |
ACL related to AFS Securities | 0 |  | 0 |
Sales of securities held to maturity | 0 | 0 |  |
Amortized cost of available for sale securities transferred to held to maturity |  |  |  | $ 4,100,000,000
Fair value of available for sale securities transferred to held to maturity |  |  |  | $ 3,800,000,000
Gain (loss) on transfer of securities | 0 |  |  |
Unamortized unrealized loss | 132,100,000 |  | 139,200,000 |
Accrued interest on securities held to maturity | 25,200,000 |  | 28,000,000 |
Unrealized gain (loss) on trading securities | (6,000) | $ (15,000) |  |
Securities sold not yet purchased | 8,300,000 |  | 4,100,000 |
Securities held to maturity with an acquired fair value | 5,172,564,000 |  | 5,250,465,000 |
Other securities | 685,590,000 |  | 676,300,000 |
Collateral Pledged [Member] | U.S. Government and Other Public Deposit [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Pledged securities for deposits | $ 12,700,000,000 |  | $ 13,400,000,000 |

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