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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue (Expense) out of Scope of ASC 606 | $ 55,340 | $ 25,929 | $ 65,250 | $ 30,438
Noninterest income | 176,335 | 131,589 | 300,013 | 240,486
Trust and Securities Processing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Noninterest income | 58,886 | 53,863 | 118,414 | 108,697
Trading and Investment Banking [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue (Expense) out of Scope of ASC 606 | 7,063 | 8,350 | 12,347 | 17,405
Noninterest income | 7,123 | 8,670 | 12,563 | 18,026
Service Charges On Deposit Accounts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue (Expense) out of Scope of ASC 606 | 50 | 78 | 120 | 148
Noninterest income | 20,835 | 22,592 | 45,477 | 44,568
Insurance Fees and Commissions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Noninterest income | 245 | 245 | 504 | 665
Brokerage Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Noninterest income | 12,391 | 2,592 | 15,847 | 5,926
Bankcard Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue (Expense) out of Scope of ASC 606 | (9,383) | (8,810) | (17,272) | (16,426)
Noninterest income | 17,840 | 16,063 | 34,475 | 30,736
Investment Securities Gains, Net [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue (Expense) out of Scope of ASC 606 | 60,720 | 15,455 | 60,198 | 7,119
Noninterest income | 60,720 | 15,455 | 60,198 | 7,119
Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue (Expense) out of Scope of ASC 606 | (3,110) | 10,856 | 9,857 | 22,192
Noninterest income | (1,705) | 12,109 | 12,535 | 24,749
Commercial Banking [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 24,760 | 23,318 | 47,876 | 44,053
Noninterest income | 56,894 | 37,106 | 83,594 | 45,281
Commercial Banking [Member] | Service Charges On Deposit Accounts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 8,696 | 8,606 | 17,641 | 16,510
Commercial Banking [Member] | Brokerage Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 75 | 10 | 108 | 74
Commercial Banking [Member] | Bankcard Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 15,757 | 14,499 | 29,731 | 27,035
Commercial Banking [Member] | Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 232 | 203 | 396 | 434
Institutional Banking [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 72,047 | 58,725 | 138,817 | 115,623
Noninterest income | 81,082 | 68,745 | 154,354 | 137,166
Institutional Banking [Member] | Trust and Securities Processing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 45,355 | 40,118 | 90,840 | 77,603
Institutional Banking [Member] | Trading and Investment Banking [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 60 | 320 | 216 | 621
Institutional Banking [Member] | Service Charges On Deposit Accounts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 10,250 | 12,432 | 24,140 | 25,009
Institutional Banking [Member] | Brokerage Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 10,350 | 673 | 11,834 | 1,992
Institutional Banking [Member] | Bankcard Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 5,553 | 4,771 | 10,884 | 9,583
Institutional Banking [Member] | Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 479 | 411 | 903 | 815
Personal Banking [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 24,188 | 23,617 | 48,070 | 50,372
Noninterest income | 38,359 | 25,738 | 62,065 | 58,039
Personal Banking [Member] | Trust and Securities Processing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 13,531 | 13,745 | 27,574 | 31,094
Personal Banking [Member] | Service Charges On Deposit Accounts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 1,839 | 1,476 | 3,576 | 2,901
Personal Banking [Member] | Insurance Fees and Commissions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 245 | 245 | 504 | 665
Personal Banking [Member] | Brokerage Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 1,966 | 1,909 | 3,905 | 3,860
Personal Banking [Member] | Bankcard Fees [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | 5,913 | 5,603 | 11,132 | 10,544
Personal Banking [Member] | Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue Scope of ASC 606 | $ 694 | $ 639 | $ 1,379 | $ 1,308

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