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Loans and Leases and the Allowance for Credit Losses - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]      
Accrued interest receivable $ 67,887   $ 66,525
Revolving loans, converted to term loan during the period $ 3,400   13,200
Number of days non-accrual loans are not past due 30 days    
Consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure $ 4,600    
Pass | Residential Mortgage      
Accounts Notes And Loans Receivable [Line Items]      
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%    
Pass | Home Equity      
Accounts Notes And Loans Receivable [Line Items]      
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%    
Maximum current combined loan-to-value ratio for residential mortgage and home equity loans to be considered as pass (as a percent) 60.00%    
Classified      
Accounts Notes And Loans Receivable [Line Items]      
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    
Accrued Interest Receivable      
Accounts Notes And Loans Receivable [Line Items]      
Accrued interest receivable $ 48,400   $ 48,400
Maximum [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net gains (loss) related to sales of residential mortgage loans $ 100 $ 100  
Consumer | Classified      
Accounts Notes And Loans Receivable [Line Items]      
Number of days past due for loans and leases in classified credit quality indicator 90 days