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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue (Expense) out of Scope of ASC 606 | $ 5,731 | $ 1,043 | $ 70,981 | $ 31,481
Noninterest income | 128,723 | 107,907 | 428,736 | 348,393
Trust and Securities Processing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Noninterest income | 59,586 | 56,914 | 178,000 | 165,611
Trading and Investment Banking [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue (Expense) out of Scope of ASC 606 | 5,425 | 5,807 | 17,772 | 23,212
Noninterest income | 5,387 | 5,936 | 17,950 | 23,962
Service Charges On Deposit Accounts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue (Expense) out of Scope of ASC 606 | 33 | 88 | 153 | 236
Noninterest income | 19,932 | 19,881 | 65,409 | 64,449
Insurance Fees and Commissions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Noninterest income | 375 | 285 | 879 | 950
Brokerage Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Noninterest income | 13,840 | 2,899 | 29,687 | 8,825
Bankcard Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue (Expense) out of Scope of ASC 606 | (8,578) | (8,363) | (25,850) | (24,789)
Noninterest income | 19,379 | 17,198 | 53,854 | 47,934
Investment Securities Gains (Losses), Net [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue (Expense) out of Scope of ASC 606 | (1,345) | (3,510) | 58,853 | 3,609
Noninterest income | (1,345) | (3,510) | 58,853 | 3,609
Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue (Expense) out of Scope of ASC 606 | 10,196 | 7,021 | 20,053 | 29,213
Noninterest income | 11,569 | 8,304 | 24,104 | 33,053
Commercial Banking [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 25,281 | 23,719 | 73,157 | 67,772
Noninterest income | 16,785 | 17,048 | 100,379 | 62,306
Commercial Banking [Member] | Service Charges On Deposit Accounts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 8,357 | 8,164 | 25,998 | 24,674
Commercial Banking [Member] | Brokerage Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 66 | 16 | 174 | 90
Commercial Banking [Member] | Bankcard Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 16,656 | 15,300 | 46,387 | 42,335
Commercial Banking [Member] | Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 202 | 239 | 598 | 673
Institutional Banking [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 73,642 | 58,675 | 212,459 | 174,298
Noninterest income | 89,386 | 65,568 | 243,740 | 202,769
Institutional Banking [Member] | Trust and Securities Processing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 46,385 | 42,697 | 137,225 | 120,300
Institutional Banking [Member] | Trading and Investment Banking [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | (38) | 129 | 178 | 750
Institutional Banking [Member] | Service Charges On Deposit Accounts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 9,564 | 9,867 | 33,704 | 34,876
Institutional Banking [Member] | Brokerage Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 11,904 | 851 | 23,738 | 2,843
Institutional Banking [Member] | Bankcard Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 5,350 | 4,727 | 16,234 | 14,310
Institutional Banking [Member] | Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 477 | 404 | 1,380 | 1,219
Personal Banking [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 24,069 | 24,470 | 72,139 | 74,842
Noninterest income | 22,552 | 25,291 | 84,617 | 83,318
Personal Banking [Member] | Trust and Securities Processing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 13,201 | 14,217 | 40,775 | 45,311
Personal Banking [Member] | Service Charges On Deposit Accounts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 1,978 | 1,762 | 5,554 | 4,663
Personal Banking [Member] | Insurance Fees and Commissions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 375 | 285 | 879 | 950
Personal Banking [Member] | Brokerage Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 1,870 | 2,032 | 5,775 | 5,892
Personal Banking [Member] | Bankcard Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 5,951 | 5,534 | 17,083 | 16,078
Personal Banking [Member] | Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | $ 694 | $ 640 | $ 2,073 | $ 1,948

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