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Loans and Leases and the Allowance for Credit Losses - Schedule of Loan and Lease Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Loan and lease portfolio
Loans and Leases	$ 12,041,378	$ 11,940,020
Commercial
Loan and lease portfolio
Loans and Leases	5,103,146	5,100,686
Commercial | Commercial and Industrial
Loan and lease portfolio
Loans and Leases	1,257,305	1,357,610
Commercial | PPP
Loan and lease portfolio
Loans and Leases	513,513	517,683
Commercial | Commercial Mortgage
Loan and lease portfolio
Loans and Leases	2,944,435	2,854,829
Commercial | Construction
Loan and lease portfolio
Loans and Leases	277,393	259,798
Commercial | Lease Financing
Loan and lease portfolio
Loans and Leases	110,500	110,766
Consumer
Loan and lease portfolio
Loans and Leases	6,938,232	6,839,334
Consumer | Other
Loan and lease portfolio
Loans and Leases	364,542	395,483
Consumer | Residential Mortgage
Loan and lease portfolio
Loans and Leases	4,264,180	4,130,513
Consumer | Home Equity
Loan and lease portfolio
Loans and Leases	1,594,781	1,604,538
Consumer | Automobile
Loan and lease portfolio
Loans and Leases	$ 714,729	$ 708,800

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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-Section 50
-Paragraph 4
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