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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, 2025	Dec. 31, 2024
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	$ 14,021,579	$ 14,075,980
Commercial
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	6,095,100	6,125,409
Commercial | Commercial Mortgage
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	4,040,711	4,020,622
Commercial | Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	1,581,232	1,705,133
Commercial | Construction
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	380,944	308,898
Commercial | Lease Financing
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	92,213	90,756
Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	7,926,479	7,950,571
Consumer | Residential Mortgage
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	4,685,214	4,628,283
Consumer | Home Equity
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	2,129,599	2,165,514
Consumer | Automobile
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	699,244	764,146
Consumer | Other
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases	$ 412,422	$ 392,628

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-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

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

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