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Loans and Allowance for Credit Losses - Summary of Amortized Cost of Nonaccrual Loans with No Related Allowance (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual Loans | $ 96,536 | $ 87,823
Amortized Cost of Nonaccrual Loans with no related Allowance | 91,851 | 42,122
Commercial and Industrial Portfolio [Member] |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual Loans | 83,445 | 33,769
Amortized Cost of Nonaccrual Loans with no related Allowance | 79,971 | 9,916
Specialty Lending Portfolio [Member] |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual Loans | 1,211 | 19,437
Amortized Cost of Nonaccrual Loans with no related Allowance |  | 242
Commercial Real Estate Portfolio [Member] |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual Loans | 6,687 | 28,386
Amortized Cost of Nonaccrual Loans with no related Allowance | 6,687 | 25,733
Consumer Real Estate Portfolio [Member] |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual Loans | 4,631 | 5,345
Amortized Cost of Nonaccrual Loans with no related Allowance | 4,631 | 5,345
Consumer Portfolio [Member] |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual Loans | 62 | 88
Amortized Cost of Nonaccrual Loans with no related Allowance | 62 | 88
Credit Cards Portfolio [Member] |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual Loans | 500 | 798
Amortized Cost of Nonaccrual Loans with no related Allowance | $ 500 | $ 798

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