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Fair Value Measurements - Narrative (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Broker dealer deposit program fair value | $ 2,500,000 |  |
Total credit-related financial instruments with off-balance sheet risk | 13,176,616 | $ 12,237,964 |
Total write-ups | 2,000 |  |
Total write-downs due to impairment | 500 |  |
Proceeds from sales of alternative investments | 13,441 | 19,588 | $ 0
Gains on sale | 8,806 | 14,763 | $ 0
Loans transferred to held-for-sale | 12,700 | 27,300 |
Amortized cost of consumer loans | 9,000 |  |
Fair Value, Nonrecurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments held in Rabbi Trust | 1,500 | 400 |
Carrying amount of alternative investments | 4,600 |  |
Proceeds from sales of alternative investments | 13,400 |  |
Gains on sale | 8,800 |  |
Re-sign broker dealers |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Contingent consideration |  | 182 |
Re-sign broker dealers | Maximum |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Contingent consideration | 35,000 | 207 |
Rabbi Trust |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments held in Rabbi Trust | 11,200 | 9,200 |
Alternative investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments held in Rabbi Trust | 52,200 | 30,100 |
Readily determinable fair value proceeds |  | 1,200 |
Write-down of TDR's |  | 300 |
Alternative investments, carrying amount | 57,500 | 43,400 |
Alternative investments | Fair Value, Nonrecurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total credit-related financial instruments with off-balance sheet risk | 86,100 | 61,500 |
Alternative investments measured at fair value | $ 7,500 | $ 8,300 |

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