Loans and Leases and the Allowance for Credit Losses - Schedule of Loan and Lease Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Loan and lease portfolio
Loans and Leases	$ 12,259,076	$ 11,940,020
Commercial
Loan and lease portfolio
Loans and Leases	4,966,192	5,100,686
Commercial | Commercial and Industrial
Loan and lease portfolio
Loans and Leases	1,361,921	1,357,610
Commercial | PPP
Loan and lease portfolio
Loans and Leases	126,779	517,683
Commercial | Commercial Mortgage
Loan and lease portfolio
Loans and Leases	3,152,130	2,854,829
Commercial | Construction
Loan and lease portfolio
Loans and Leases	220,254	259,798
Commercial | Lease Financing
Loan and lease portfolio
Loans and Leases	105,108	110,766
Consumer
Loan and lease portfolio
Loans and Leases	7,292,884	6,839,334
Consumer | Other
Loan and lease portfolio
Loans and Leases	410,129	395,483
Consumer | Residential Mortgage
Loan and lease portfolio
Loans and Leases	4,309,602	4,130,513
Consumer | Home Equity
Loan and lease portfolio
Loans and Leases	1,836,588	1,604,538
Consumer | Automobile
Loan and lease portfolio
Loans and Leases	$ 736,565	$ 708,800