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Loans and Allowance for Credit Losses - Additional Information (Detail) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) application portfolio segment loan | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) application
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Number of loan portfolios | portfolio | 4 |  |
Number of loan segments | segment | 7 |  |
Total loans | $ 13,925,261,000 |  | $ 13,786,479,000
Accrued interest receivable, loans | $ 53,700,000 |  | 57,300,000
Loan placed on nonaccrual when past due, number of days | 90 days |  |
Loan participations | $ 1,108,000,000 |  |
Loan participations sold | 496,300,000 |  |
Loan participations retained | $ 611,800,000 |  |
TDR term | 6 months |  |
Minimum number of days for loan charge off to be recorded | 120 days |  |
Maximum number of days for loan charge off to be recorded | 180 days |  |
Financing receivable TDRs included with non-accrual loans | $ 14,300,000 |  | 14,900,000
Financing receivable TDR specific reserves | $ 800,000 |  | $ 1,600,000
Financing receivable, TDR, number of loans qualified for removal | loan | 1 |  |
Charge-offs | $ (15,000) | $ 1,961,000 |
Number of days for a loan to be considered to be in payment default | 90 days |  |
Troubled Debt Restructurings During Period |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Charge-offs | $ 0 | 0 |
Commercial |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
PPP, number of applications processed and approved (over) | application | 4,800 |  | 9,700
PPP, amount of funding | $ 517,300,000 |  | $ 1,500,000,000
Total loans | 4,068,896,000 |  | 3,956,422,000
Charge-offs | 0 | 695,000 |
Commercial | PPP Loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 1,124,000,000 |  | 943,000,000.0
Commercial real estate |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | $ 6,074,135,000 |  | $ 5,946,512,000
Percentage of risk-based capital | 226.00% |  |
Regulatory guideline limit | 300.00% |  |
Charge-offs | $ (8,000) | $ 1,272,000 |

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