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Loans and Leases and the Allowance for Credit Losses - Schedule of Aging Analysis by Class of Loan and Lease Portfolio (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due $ 14,021,579 $ 14,075,980
Non-Accrual 16,739 16,643
Total Past Due and Non-Accrual 57,777 65,097
Non-Accrual Loans and Leases that are Current 5,275 1,862
Commercial    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 6,095,100 6,125,409
Non-Accrual 6,004 7,077
Total Past Due and Non-Accrual 6,070 7,284
Non-Accrual Loans and Leases that are Current 2,417 0
Commercial | Commercial Mortgage    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 4,040,711 4,020,622
Non-Accrual 2,498 2,450
Total Past Due and Non-Accrual 2,498 2,450
Non-Accrual Loans and Leases that are Current 0 0
Commercial | Commercial and Industrial    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 1,581,232 1,705,133
Non-Accrual 3,506 4,627
Total Past Due and Non-Accrual 3,572 4,834
Non-Accrual Loans and Leases that are Current 2,417 0
Commercial | Construction    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 380,944 308,898
Non-Accrual 0 0
Total Past Due and Non-Accrual 0 0
Non-Accrual Loans and Leases that are Current 0 0
Commercial | Lease Financing    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 92,213 90,756
Non-Accrual 0 0
Total Past Due and Non-Accrual 0 0
Non-Accrual Loans and Leases that are Current 0 0
Consumer    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 7,926,479 7,950,571
Non-Accrual 10,735 9,566
Total Past Due and Non-Accrual 51,707 57,813
Non-Accrual Loans and Leases that are Current 2,858 1,862
Consumer | Residential Mortgage    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 4,685,214 4,628,283
Non-Accrual 5,628 5,052
Total Past Due and Non-Accrual 16,513 18,394
Non-Accrual Loans and Leases that are Current 1,431 424
Consumer | Home Equity    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 2,129,599 2,165,514
Non-Accrual 5,107 4,514
Total Past Due and Non-Accrual 13,609 16,221
Non-Accrual Loans and Leases that are Current 1,427 1,438
Consumer | Automobile    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 699,244 764,146
Non-Accrual 0 0
Total Past Due and Non-Accrual 18,163 18,880
Non-Accrual Loans and Leases that are Current 0 0
Consumer | Other    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 412,422 392,628
Non-Accrual 0 0
Total Past Due and Non-Accrual 3,422 4,318
Non-Accrual Loans and Leases that are Current 0 0
30 - 59 Days Past Due    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 24,391 30,391
30 - 59 Days Past Due | Commercial    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 45 90
30 - 59 Days Past Due | Commercial | Commercial Mortgage    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 0 0
30 - 59 Days Past Due | Commercial | Commercial and Industrial    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 45 90
30 - 59 Days Past Due | Commercial | Construction    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 0 0
30 - 59 Days Past Due | Commercial | Lease Financing    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 0 0
30 - 59 Days Past Due | Consumer    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 24,346 30,301
30 - 59 Days Past Due | Consumer | Residential Mortgage    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 1,934 5,184
30 - 59 Days Past Due | Consumer | Home Equity    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 4,803 6,109
30 - 59 Days Past Due | Consumer | Automobile    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 15,810 16,443
30 - 59 Days Past Due | Consumer | Other    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 1,799 2,565
60 - 89 Days Past Due    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 5,322 9,781
60 - 89 Days Past Due | Commercial    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 21 117
60 - 89 Days Past Due | Commercial | Commercial Mortgage    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 0 0
60 - 89 Days Past Due | Commercial | Commercial and Industrial    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 21 117
60 - 89 Days Past Due | Commercial | Construction    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 0 0
60 - 89 Days Past Due | Commercial | Lease Financing    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 0 0
60 - 89 Days Past Due | Consumer    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 5,301 9,664
60 - 89 Days Past Due | Consumer | Residential Mortgage    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 1,495 4,174
60 - 89 Days Past Due | Consumer | Home Equity    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 934 2,753
60 - 89 Days Past Due | Consumer | Automobile    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 1,828 1,661
60 - 89 Days Past Due | Consumer | Other    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 1,044 1,076
Past Due 90 Days or More    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 11,325 8,282
Past Due 90 Days or More | Commercial    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 0 0
Past Due 90 Days or More | Commercial | Commercial Mortgage    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 0 0
Past Due 90 Days or More | Commercial | Commercial and Industrial    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 0 0
Past Due 90 Days or More | Commercial | Construction    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 0 0
Past Due 90 Days or More | Commercial | Lease Financing    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 0 0
Past Due 90 Days or More | Consumer    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 11,325 8,282
Past Due 90 Days or More | Consumer | Residential Mortgage    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 7,456 3,984
Past Due 90 Days or More | Consumer | Home Equity    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 2,765 2,845
Past Due 90 Days or More | Consumer | Automobile    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 525 776
Past Due 90 Days or More | Consumer | Other    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 579 677
Current    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 13,963,802 14,010,883
Current | Commercial    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 6,089,030 6,118,125
Current | Commercial | Commercial Mortgage    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 4,038,213 4,018,172
Current | Commercial | Commercial and Industrial    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 1,577,660 1,700,299
Current | Commercial | Construction    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 380,944 308,898
Current | Commercial | Lease Financing    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 92,213 90,756
Current | Consumer    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 7,874,772 7,892,758
Current | Consumer | Residential Mortgage    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 4,668,701 4,609,889
Current | Consumer | Home Equity    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 2,115,990 2,149,293
Current | Consumer | Automobile    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due 681,081 745,266
Current | Consumer | Other    
Aging Analysis of Accruing and Non-Accruing Loans and Leases    
Days Past Due $ 409,000 $ 388,310