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Revenue Recognition - Summary of Disaggregation of Revenue According to Revenue Stream and Business Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Disaggregation Of Revenue [Line Items] |  |
Revenue (Expense) out of Scope of ASC 606 | $ 15,423 | $ (442)
Noninterest income | 204,793 | 166,198
Trust and Securities Processing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Noninterest income | 94,667 | 79,781
Trading and Investment Banking [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue (Expense) out of Scope of ASC 606 | 7,618 | 5,582
Noninterest income | 7,740 | 5,911
Service Charges On Deposit Accounts [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue (Expense) out of Scope of ASC 606 | 32 | 39
Noninterest income | 29,474 | 27,457
Insurance Fees and Commissions [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Noninterest income | 255 | 178
Brokerage Fees [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Noninterest income | 21,089 | 18,102
Bankcard Fees [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue (Expense) out of Scope of ASC 606 | (12,173) | (11,796)
Noninterest income | 28,878 | 26,293
Investment Securities Gains (Losses), Net [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue (Expense) out of Scope of ASC 606 | 3,046 | (4,782)
Noninterest income | 3,046 | (4,782)
Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue (Expense) out of Scope of ASC 606 | 16,900 | 10,515
Noninterest income | 19,644 | 13,258
Commercial Banking [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 44,242 | 40,570
Commercial Banking [Member] | Trust and Securities Processing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 761 | 479
Commercial Banking [Member] | Service Charges On Deposit Accounts [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 16,144 | 14,581
Commercial Banking [Member] | Brokerage Fees [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 87 | 67
Commercial Banking [Member] | Bankcard Fees [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 26,086 | 24,164
Commercial Banking [Member] | Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 1,164 | 1,279
Institutional Banking [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 111,301 | 95,732
Institutional Banking [Member] | Trust and Securities Processing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 73,325 | 61,248
Institutional Banking [Member] | Trading and Investment Banking [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 122 | 329
Institutional Banking [Member] | Service Charges On Deposit Accounts [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 10,857 | 10,859
Institutional Banking [Member] | Brokerage Fees [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 18,365 | 15,372
Institutional Banking [Member] | Bankcard Fees [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 7,894 | 7,242
Institutional Banking [Member] | Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 738 | 682
Personal Banking [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 33,827 | 30,338
Personal Banking [Member] | Trust and Securities Processing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 20,581 | 18,054
Personal Banking [Member] | Service Charges On Deposit Accounts [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 2,441 | 1,978
Personal Banking [Member] | Insurance Fees and Commissions [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 255 | 178
Personal Banking [Member] | Brokerage Fees [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 2,637 | 2,663
Personal Banking [Member] | Bankcard Fees [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | 7,071 | 6,683
Personal Banking [Member] | Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue Scope of ASC 606 | $ 842 | $ 782

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