v3.25.2
Basis of Financial Statements and Summary of Significant Accounting Policies (Useful Lives of Intangible Assets and Amortization Method by Major Class) (Detail)
Mar. 31, 2025
Software | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible assets, Useful life, years 3 years
Software | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible assets, Useful life, years 10 years
Core deposit intangibles | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible assets, Useful life, years 9 years
Core deposit intangibles | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible assets, Useful life, years 16 years
Customer relationships | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible assets, Useful life, years 3 years
Customer relationships | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible assets, Useful life, years 27 years
Trade names | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible assets, Useful life, years 5 years
Trade names | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived intangible assets, Useful life, years 40 years