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Premises and Equipment - Summary of Maximum Estimated Useful Lives to Amortize Assets (Detail)
 12 Months Ended
Oct. 31, 2025
Buildings [member] | Bottom of range [member]  
Disclosure Of Property Plant And Equipment Estimated Useful Life [Line Items]  
Estimated useful lives of assets 10 years
Buildings [member] | Top of range [member]  
Disclosure Of Property Plant And Equipment Estimated Useful Life [Line Items]  
Estimated useful lives of assets 40 years
Computer equipment and operating system software [member] | Bottom of range [member]  
Disclosure Of Property Plant And Equipment Estimated Useful Life [Line Items]  
Estimated useful lives of assets 5 years
Computer equipment and operating system software [member] | Top of range [member]  
Disclosure Of Property Plant And Equipment Estimated Useful Life [Line Items]  
Estimated useful lives of assets 7 years
Other equipment [member]  
Disclosure Of Property Plant And Equipment Estimated Useful Life [Line Items]  
Estimated useful lives of assets 10 years
Leasehold improvements [member]  
Disclosure Of Property Plant And Equipment Estimated Useful Life [Line Items]  
Estimated useful lives of assets Lease term to a maximum of 10 years