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Loans and Leases and the Allowance for Credit Losses - Schedule of Loan and Lease Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	$ 13,919,491	$ 13,646,420
Commercial
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	5,679,469	5,464,503
Commercial | Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	1,569,572	1,389,066
Commercial | Commercial Mortgage
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	3,784,339	3,725,542
Commercial | Construction
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	251,507	260,825
Commercial | Paycheck Protection Program
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	12,529	19,579
Commercial | Lease Financing
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	61,522	69,491
Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	8,240,022	8,181,917
Consumer | Residential Mortgage
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	4,699,140	4,653,072
Consumer | Home Equity
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	2,285,974	2,225,950
Consumer | Automobile
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	856,113	870,396
Consumer | Other
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	$ 398,795	$ 432,499

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+ References

No definition available.

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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
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-4

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