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Loans and Allowance for Credit Losses - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 segment | Dec. 31, 2020 | Dec. 31, 2020 portfolio | Dec. 31, 2020 application
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Number of loan portfolios | portfolio |  |  |  |  |  | 4 |
Number of loan segments |  |  |  | 7 |  | 7 |
Total loans, net of unearned income | $ 13,786,479,000 | $ 12,117,524,000 |  |  |  |  |
Accrued interest receivable, loans | $ 57,300,000 |  |  |  |  |  |
Loan placed on nonaccrual when past due, number of days | 90 days |  |  |  |  |  |
Loan participations | $ 1,043,000,000.000 |  |  |  |  |  |
Loan participations sold | 478,900,000 |  |  |  |  |  |
Loan participations retained | 563,600,000 |  |  |  |  |  |
Financing receivable TDR's included with non-accrual loans | 14,900,000 | 13,800,000 |  |  |  |  |
Financing receivable troubled debt restructurings specific reserves | 1,600,000 | 900,000 |  |  |  |  |
Unfunded commitments on TDRs | 0 | 2,300,000 |  |  |  |  |
Recoveries from credit losses | (38,395,000) |  | $ (6,966,000) |  |  |  |
Charge-offs | (5,450,000) |  | (431,000) |  |  |  |
Allowance for loan losses charge-offs | $ 15,553,000 |  | 12,969,000 |  |  |  |
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] |  |  |  |  |  |  |
Recoveries from credit losses | $ 300,000 | 2,000,000.0 |  |  |  |  |
Charge-offs | 0 | 3,900,000 | 0 |  |  |  |
Commercial |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
PPP, number of applications processed and approved (over) | application |  |  |  |  |  |  | 9,700
PPP, amount of funding | 1,500,000,000 |  |  |  |  |  |
Total loans, net of unearned income | 3,956,422,000 | 2,890,296,000 |  |  |  |  |
Recoveries from credit losses | (4,022,000) |  | (4,064,000) |  |  |  |
Charge-offs | (633,000) |  | 169,000 |  |  |  |
Allowance for loan losses charge-offs | 5,593,000 |  | 3,087,000 |  |  |  |
Commercial | PPP Loans |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Total loans, net of unearned income | 943,000,000.0 |  |  |  |  |  |
Commercial real estate |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Total loans, net of unearned income | 5,946,512,000 | $ 5,166,792,000 |  |  |  |  |
Percentage of risk-based capital |  |  |  |  | 222.00% |  |
Regulatory guideline limit |  |  |  |  | 300.00% |  |
Recoveries from credit losses | (29,535,000) |  | (173,000) |  |  |  |
Charge-offs | (4,801,000) |  | (561,000) |  |  |  |
Allowance for loan losses charge-offs | $ 4,323,000 |  | $ 879,000 |  |  |  |
Credit Concentration Risk | Non Residential Real Estate |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Concentration risk percentage | 10.00% |  |  |  |  |  |
Credit Concentration Risk | Residential Real Estate |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Concentration risk percentage | 10.00% |  |  |  |  |  |

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