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Goodwill and Other Acquisition-Related Intangible Assets - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Goodwill And Other Intangible Assets [Line Items]      
Goodwill $ 3,065,500,000   $ 3,065,500,000
Tax deductible goodwill amount 131,800,000   134,400,000
Other acquisition-related intangible assets 198,500,000   209,100,000
Amortization of other acquisition-related intangible assets 10,700,000 $ 6,700,000  
Amortization expense attributable to other acquisition-related intangible assets, 2020 40,900,000    
Amortization expense attributable to other acquisition-related intangible assets, 2021 36,100,000    
Amortization expense attributable to other acquisition-related intangible assets, 2022 31,700,000    
Amortization expense attributable to other acquisition-related intangible assets, 2023 24,000,000.0    
Amortization expense attributable to other acquisition-related intangible assets, 2024 20,300,000    
Amortization expense attributable to other acquisition-related intangible assets, 2025 17,300,000    
Impairment losses relating to goodwill or other acquisition-related intangible assets 0 $ 0  
Commercial Banking      
Goodwill And Other Intangible Assets [Line Items]      
Goodwill 1,970,000,000   1,970,000,000
Retail Banking      
Goodwill And Other Intangible Assets [Line Items]      
Goodwill 1,010,000,000.00   1,010,000,000.00
Wealth Management      
Goodwill And Other Intangible Assets [Line Items]      
Goodwill 88,500,000   $ 88,500,000
Core Deposit Intangibles      
Goodwill And Other Intangible Assets [Line Items]      
Other acquisition-related intangible assets 118,900,000    
Trade Name      
Goodwill And Other Intangible Assets [Line Items]      
Other acquisition-related intangible assets 49,000,000.0    
Client Relationship      
Goodwill And Other Intangible Assets [Line Items]      
Other acquisition-related intangible assets 17,400,000    
Trust relationships      
Goodwill And Other Intangible Assets [Line Items]      
Other acquisition-related intangible assets 7,000,000.0    
Insurance Relationships      
Goodwill And Other Intangible Assets [Line Items]      
Other acquisition-related intangible assets 3,700,000    
Favorable Lease Agreement      
Goodwill And Other Intangible Assets [Line Items]      
Other acquisition-related intangible assets 2,300,000    
Noncompete Agreements      
Goodwill And Other Intangible Assets [Line Items]      
Other acquisition-related intangible assets $ 200,000