Loans and Leases and the Allowance for Credit Losses - Schedule of Loan and Lease Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	$ 13,824,522	$ 13,646,420
Commercial
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	5,565,888	5,464,503
Commercial | Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	1,425,916	1,389,066
Commercial | Commercial Mortgage
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	3,826,283	3,725,542
Commercial | Construction
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	232,903	260,825
Commercial | Paycheck Protection Program
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	15,175	19,579
Commercial | Lease Financing
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	65,611	69,491
Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	8,258,634	8,181,917
Consumer | Residential Mortgage
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	4,691,298	4,653,072
Consumer | Home Equity
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	2,260,001	2,225,950
Consumer | Automobile
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	877,979	870,396
Consumer | Other
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	$ 429,356	$ 432,499