Loans and Leases and the Allowance for Credit Losses - Schedule of Loan and Lease Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Loan and lease portfolio
Loans and Leases	$ 13,321,606	$ 12,259,076
Commercial
Loan and lease portfolio
Loans and Leases	5,294,351	4,966,192
Commercial | Commercial and Industrial
Loan and lease portfolio
Loans and Leases	1,368,966	1,361,921
Commercial | Paycheck Protection Program
Loan and lease portfolio
Loans and Leases	22,955	126,779
Commercial | Commercial Mortgage
Loan and lease portfolio
Loans and Leases	3,591,943	3,152,130
Commercial | Construction
Loan and lease portfolio
Loans and Leases	236,498	220,254
Commercial | Lease Financing
Loan and lease portfolio
Loans and Leases	73,989	105,108
Consumer
Loan and lease portfolio
Loans and Leases	8,027,255	7,292,884
Consumer | Residential Mortgage
Loan and lease portfolio
Loans and Leases	4,585,723	4,309,602
Consumer | Home Equity
Loan and lease portfolio
Loans and Leases	2,185,484	1,836,588
Consumer | Automobile
Loan and lease portfolio
Loans and Leases	820,640	736,565
Consumer | Other
Loan and lease portfolio
Loans and Leases	$ 435,408	$ 410,129