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Loans and Allowance for Credit Losses - Summary of Loan Classes and Aging of Past Due Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | $ 18,972,158 | $ 17,170,871
Nonaccrual Loans | 18,117 | 92,300
30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 20,123 | 6,509
Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 3,446 | 2,633
Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 41,686 | 101,442
Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 18,930,472 | 17,069,429
Commercial and Industrial Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 8,308,854 | 7,258,120
Nonaccrual Loans | 10,158 | 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 | 15,369 | 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 | 1,747 | 896
Commercial and Industrial Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 27,274 | 86,568
Commercial and Industrial Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 8,281,580 | 7,171,552
Specialty Lending Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 545,837 | 522,362
Specialty Lending Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 545,837 | 522,362
Commercial Real Estate Portfolio Segment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 6,725,833 | 6,267,544
Nonaccrual Loans | 2,600 | 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 | 1,776 | 962
Commercial Real Estate Portfolio Segment | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 100 |
Commercial Real Estate Portfolio Segment | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 4,476 | 5,650
Commercial Real Estate Portfolio Segment | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 6,721,357 | 6,261,894
Consumer Real Estate Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,528,892 | 2,320,033
Nonaccrual Loans | 4,437 | 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 | 176 | 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 | 4,613 | 4,945
Consumer Real Estate Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,524,279 | 2,315,088
Consumer Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 172,591 | 129,135
Nonaccrual Loans | 561 | 75
Consumer Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 121 | 105
Consumer Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans |  | 2
Consumer Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 682 | 182
Consumer Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 171,909 | 128,953
Credit Cards Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 397,292 | 391,389
Nonaccrual Loans | 336 | 457
Credit Cards Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,681 | 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 | 1,599 | 1,246
Credit Cards Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 4,616 | 4,072
Credit Cards Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 392,676 | 387,317
Leases and Other Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 292,859 | 282,288
Nonaccrual Loans | 25 | 25
Leases and Other Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 25 | 25
Leases and Other Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | $ 292,834 | $ 282,263

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