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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, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | $ 16,469,463 | $ 16,103,651
Nonaccrual Loans | 96,536 | 87,823
30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 16,558 | 9,869
Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,319 | 1,952
Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 115,413 | 99,644
Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 16,354,050 | 16,004,007
Commercial and Industrial Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 6,856,243 | 7,062,074
Nonaccrual Loans | 83,445 | 33,769
Commercial and Industrial Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 10,174 | 4,652
Commercial and Industrial Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,281 | 319
Commercial and Industrial Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 94,900 | 38,740
Commercial and Industrial Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 6,761,343 | 7,023,334
Specialty Lending Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 508,431 | 511,300
Nonaccrual Loans | 1,211 | 19,437
Specialty Lending Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,211 | 19,437
Specialty Lending Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 507,220 | 491,863
Commercial Real Estate Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 6,155,508 | 5,908,934
Nonaccrual Loans | 6,687 | 28,386
Commercial Real Estate Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,036 | 2,351
Commercial Real Estate Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans |  | 225
Commercial Real Estate Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 7,723 | 30,962
Commercial Real Estate Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 6,147,785 | 5,877,972
Consumer Real Estate Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,245,699 | 1,945,494
Nonaccrual Loans | 4,631 | 5,345
Consumer Real Estate Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,028 | 524
Consumer Real Estate Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 77 |
Consumer Real Estate Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 5,736 | 5,869
Consumer Real Estate Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,239,963 | 1,939,625
Consumer Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 115,505 | 117,986
Nonaccrual Loans | 62 | 88
Consumer Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,729 | 281
Consumer Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 42 | 120
Consumer Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,833 | 489
Consumer Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 112,672 | 117,497
Credit Cards Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 393,093 | 366,968
Nonaccrual Loans | 500 | 798
Credit Cards Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,591 | 2,061
Credit Cards Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 919 | 1,288
Credit Cards Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 3,010 | 4,147
Credit Cards Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 390,083 | 362,821
Leases and Other Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 194,984 | 190,895
Leases and Other Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | $ 194,984 | $ 190,895

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