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Loans and Allowance for Credit Losses - Summary of Loan Classes and Aging of Past Due Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | $ 19,883,573 | $ 17,170,871
Nonaccrual Loans | 19,817 | 92,300
30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 13,201 | 6,509
Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,513 | 2,633
Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 35,531 | 101,442
Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 19,848,042 | 17,069,429
Commercial and Industrial Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 8,789,114 | 7,258,120
Nonaccrual Loans | 11,386 | 82,845
Commercial and Industrial Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 6,479 | 2,827
Commercial and Industrial Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 425 | 896
Commercial and Industrial Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 18,290 | 86,568
Commercial and Industrial Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 8,770,824 | 7,171,552
Specialty Lending Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 548,123 | 522,362
Specialty Lending Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 548,123 | 522,362
Commercial Real Estate Portfolio Segment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 7,104,217 | 6,267,544
Nonaccrual Loans | 2,596 | 4,688
Commercial Real Estate Portfolio Segment | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 4,069 | 962
Commercial Real Estate Portfolio Segment | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 6,665 | 5,650
Commercial Real Estate Portfolio Segment | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 7,097,552 | 6,261,894
Consumer Real Estate Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,634,518 | 2,320,033
Nonaccrual Loans | 4,902 | 4,210
Consumer Real Estate Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 346 | 246
Consumer Real Estate Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans |  | 489
Consumer Real Estate Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 5,248 | 4,945
Consumer Real Estate Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,629,270 | 2,315,088
Consumer Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 134,825 | 129,135
Nonaccrual Loans | 553 | 75
Consumer Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 107 | 105
Consumer Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1 | 2
Consumer Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 661 | 182
Consumer Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 134,164 | 128,953
Credit Cards Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 435,980 | 391,389
Nonaccrual Loans | 356 | 457
Credit Cards Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,200 | 2,369
Credit Cards Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,087 | 1,246
Credit Cards Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 4,643 | 4,072
Credit Cards Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 431,337 | 387,317
Leases and Other Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 236,796 | 282,288
Nonaccrual Loans | 24 | 25
Leases and Other Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 24 | 25
Leases and Other Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | $ 236,772 | $ 282,263

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