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Summary of Significant Accounting Policies - Narrative (Detail)
12 Months Ended
Dec. 31, 2024
location
segment
Property, Plant and Equipment [Line Items]  
Number of reportable segments | segment 2
Buildings | Upper Limit  
Property, Plant and Equipment [Line Items]  
Charge for depreciation, range of life 30 years
Equipment | Lower Limit  
Property, Plant and Equipment [Line Items]  
Charge for depreciation, range of life 3 years
Equipment | Upper Limit  
Property, Plant and Equipment [Line Items]  
Charge for depreciation, range of life 10 years
Leasehold Improvements  
Property, Plant and Equipment [Line Items]  
Charge for depreciation, range of life 15 years
Computer Software | Lower Limit  
Property, Plant and Equipment [Line Items]  
Software, useful life 3 years
Computer Software | Upper Limit  
Property, Plant and Equipment [Line Items]  
Software, useful life 10 years
Wealth Management segment  
Property, Plant and Equipment [Line Items]  
Services provided by business units, states | location 19