Loans and Leases and the Allowance for Credit Losses - Schedule of Loan and Lease Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Loan and lease portfolio
Loans and Leases	$ 12,544,492	$ 12,259,076
Commercial
Loan and lease portfolio
Loans and Leases	5,016,725	4,966,192
Commercial | Commercial and Industrial
Loan and lease portfolio
Loans and Leases	1,354,757	1,361,921
Commercial | Paycheck Protection Program
Loan and lease portfolio
Loans and Leases	57,809	126,779
Commercial | Commercial Mortgage
Loan and lease portfolio
Loans and Leases	3,257,689	3,152,130
Commercial | Construction
Loan and lease portfolio
Loans and Leases	248,363	220,254
Commercial | Lease Financing
Loan and lease portfolio
Loans and Leases	98,107	105,108
Consumer
Loan and lease portfolio
Loans and Leases	7,527,767	7,292,884
Consumer | Residential Mortgage
Loan and lease portfolio
Loans and Leases	4,405,718	4,309,602
Consumer | Home Equity
Loan and lease portfolio
Loans and Leases	1,958,285	1,836,588
Consumer | Automobile
Loan and lease portfolio
Loans and Leases	742,934	736,565
Consumer | Other
Loan and lease portfolio
Loans and Leases	$ 420,830	$ 410,129