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Loans and Leases and the Allowance for Credit Losses - Additional Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Loan
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Loan
Loan and lease portfolio      
Net gains related to sales of residential mortgage loans $ 2,100 $ 3,200  
Accrued interest receivable $ 47,917   $ 49,303
Number of paycheck protection loans | Loan 6,911   4,435
Revolving loans, converted to term loan during the period $ 900 $ 600  
Number of days non-accrual loans are not past due 30 days    
Recorded Investment $ 84,100   $ 72,500
Available commitments to lend additional funds on loans modified as TDR 300   $ 500
Consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure $ 1,500    
Consumer      
Loan and lease portfolio      
Number of loan and lease concessions - COVID-19 | Loan 419   1,920
Loan and lease modifications, amount - COVID-19 $ 51,100   $ 178,100
Commercial      
Loan and lease portfolio      
Number of loan and lease concessions - COVID-19 | Loan 118   210
Loan and lease modifications, amount - COVID-19 $ 271,000   $ 311,600
Classified      
Loan and lease portfolio      
Number of months up to which residential and home equity loans may be considered classified, even if they are current as to principal and interest 6 months    
Classified | Residential Mortgage      
Loan and lease portfolio      
Number of days past due for loans and leases in classified credit quality indicator 90 days    
Maximum current loan-to-value ratio for residential mortgage and home equity loans to be considered as pass (as a percent) 60.00%    
Classified | Home Equity      
Loan and lease portfolio      
Number of days past due for loans and leases in classified credit quality indicator 90 days    
Maximum current loan-to-value ratio for residential mortgage and home equity loans to be considered as pass (as a percent) 60.00%    
Classified | Consumer      
Loan and lease portfolio      
Number of days past due for loans and leases in classified credit quality indicator 90 days    
Minimum      
Loan and lease portfolio      
Default period past due following modification of loans in TDR (in days) 60 days    
Maximum | Residential Mortgage      
Loan and lease portfolio      
Period of time loan being fully amortized 40 years    
Maximum | Land Loan      
Loan and lease portfolio      
Period of time loan being fully amortized 360 months    
Extending balloon payments 5 years    
PPP Loans, Administered by the SBA      
Loan and lease portfolio      
Loans interest rate 1.00%    
Long-term debt, gross $ 744,800   528,100
PPP Loans, Administered by the SBA | Minimum      
Loan and lease portfolio      
Loans maturity period 2 years    
PPP Loans, Administered by the SBA | Maximum      
Loan and lease portfolio      
Loans maturity period 5 years    
Accrued Interest Receivable      
Loan and lease portfolio      
Accrued interest receivable $ 34,100   $ 35,900