Quarterly report [Sections 13 or 15(d)]

Loans - Schedule of Loan Modifications (Parenthetical) (Detail)

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Loans - Schedule of Loan Modifications (Parenthetical) (Detail) - Loan
3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Interest Only Principal Deferment [Member] | Commercial Property Loans: Retail    
Financing Receivable, Modified [Line Items]    
Number of loan 2  
Term extension of loan 3 months  
Commercial and Industrial | Term Loan One    
Financing Receivable, Modified [Line Items]    
Number of loan 1 1
Term extension of loan 6 years 6 years
Commercial and Industrial | Term Loan One | Interest Only Principal Deferment [Member]    
Financing Receivable, Modified [Line Items]    
Number of loan 1 1
Term of interest only loan   6 months
Term extension of loan 6 months  
Commercial and Industrial | Term Loan Two    
Financing Receivable, Modified [Line Items]    
Number of loan 1 1
Term extension of loan 6 months 6 months
Commercial and Industrial | Term Loan Two | Interest Only Principal Deferment [Member]    
Financing Receivable, Modified [Line Items]    
Number of loan 1 1
Term of interest only loan   12 months
Term extension of loan 12 months