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Loans and Allowance for Credit Losses - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) portfolio loan | Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Number of loan portfolios | portfolio |  | 4 |  |
Number of loan segments | portfolio |  | 7 |  |
Total loans, net of unearned income |  | $ 13,601,846,000 | $ 13,786,479,000 |
Financing receivable, accrued interest |  | $ 47,600,000 | 57,300,000 |
Loan placed on nonaccrual when past due, number of days |  | 90 days |  |
Loan participations |  | $ 1,256,000,000 |  |
Loan participations sold |  | 619,600,000 |  |
Loan participations retained |  | $ 636,100,000 |  |
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 TDR's included with non-accrual loans |  | $ 11,700,000 | 14,900,000 |
Financing receivable troubled debt restructurings specific reserves |  | 700,000 | 1,600,000 |
Unfunded commitments on TDRs |  | 0 | 0 |
(Decrease) increase in allowance for credit losses | [1] | 28,812,000 | (38,395,000) | $ (4,747,000)
Charge-offs |  | $ (36,000) | (5,450,000) |
Number of days for a loan to be considered to be in payment default |  | 90 days |  |
CARES Act Modification |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Non-TDR modifications, amount |  | $ 6,400,000 |  |
Troubled Debt Restructurings During Period |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
(Decrease) increase in allowance for credit losses |  | (900,000) | 300,000 | 2,000,000
Charge-offs |  | $ 0 | $ 0 | $ 3,900,000
Commercial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
PPP, number of applications processed and approved (over) | loan |  | 6,200 | 9,700 |
PPP, amount of funding |  | $ 583,700,000 | $ 1,518,000,000 |
Total loans, net of unearned income |  | 3,391,769,000 | 3,956,422,000 |
(Decrease) increase in allowance for credit losses |  | 2,898,000 | (4,022,000) |
Charge-offs |  | 0 | (633,000) |
Commercial | PPP Loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income |  | 169,000,000 | 943,000,000 |
Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income |  | $ 6,380,674,000 | 5,946,512,000 |
Percentage of risk-based capital |  | 230.00% |  |
Regulatory guideline limit |  | 300.00% |  |
(Decrease) increase in allowance for credit losses |  | $ 15,945,000 | (29,535,000) |
Charge-offs |  | $ (24,000) | $ (4,801,000) |
[1] | Beginning January 1, 2020, with the adoption of CECL, calculation is based on current expected credit loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.

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