v3.25.4
Loans and Related Allowance for Credit Losses, Loan Concentrations (Details) - Loans [Member]
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Residential mortgage [Member] | Geographic concentration risk [Member] | California [Member]    
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]    
Concentration risk, percentage 11.00% 12.00%
Total Commercial [Member] | Commercial and industrial loans and leases [Member] | Product concentration risk [Member] | Financial institutions except banks [Member]    
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]    
Concentration risk, percentage 21.00% 17.00%
Total Commercial [Member] | Commercial real estate [Member] | Product concentration risk [Member] | Maximum [Member]    
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]    
Concentration risk, percentage 10.00% 10.00%
Total Consumer [Member] | Residential mortgage [Member] | Geographic concentration risk [Member] | Maximum [Member] | California, larger metropolitan areas [Member]    
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]    
Concentration risk, percentage 4.00% 4.00%
Interest-only loans [Member] | Total Consumer [Member] | Residential mortgage [Member] | Product concentration risk [Member]    
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]    
Concentration risk, percentage 2.00% 2.00%