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Loans and Allowance for Credit Losses - Additional Information (Details)
 12 Months Ended
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.