Loans and Leases and the Allowance for Credit Losses - Schedule of Loan and Lease Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	$ 13,831,266	$ 13,965,026
Commercial
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	5,815,537	5,777,486
Commercial | Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	1,691,441	1,652,699
Commercial | Paycheck Protection Program
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	7,997	11,369
Commercial | Commercial Mortgage
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	3,741,140	3,749,016
Commercial | Construction
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	315,571	304,463
Commercial | Lease Financing
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	59,388	59,939
Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	8,015,729	8,187,540
Consumer | Residential Mortgage
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	4,595,586	4,684,171
Consumer | Home Equity
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	2,221,073	2,264,827
Consumer | Automobile
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	806,240	837,830
Consumer | Other
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	$ 392,830	$ 400,712