v3.26.1
Loans and Allowances for Credit Losses, Modifications (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Financing Receivable, Loan Modifications [Line Items]    
Financing Receivable, Modified in Period, Amount $ 103.0 $ 51.0
Financing Receivable, Modified, Subsequent Default $ 4.4 18.0
Number of Days Past Due Following Modification to be Considered a Payment Default 30 days  
Commercial [Member] | Extended Maturity    
Financing Receivable, Loan Modifications [Line Items]    
Financing Receivable, Modified in Period, Amount   39.0
Commercial real estate [Member]    
Financing Receivable, Loan Modifications [Line Items]    
Financing Receivable, Modified in Period, Amount $ 16.0  
Commercial and Commercial Real Estate Portfolio | Extended Maturity    
Financing Receivable, Loan Modifications [Line Items]    
Financing Receivable, Modified in Period, Amount 96.0  
Healthcare [Member] | Commercial [Member]    
Financing Receivable, Loan Modifications [Line Items]    
Financing Receivable, Modified in Period, Amount 75.0 26.0
Healthcare [Member] | Commercial [Member] | Extended Maturity    
Financing Receivable, Loan Modifications [Line Items]    
Financing Receivable, Modified, Subsequent Default   11.0
Services [Member] | Commercial [Member]    
Financing Receivable, Loan Modifications [Line Items]    
Financing Receivable, Modified in Period, Amount   10.0
General business [Member] | Commercial [Member] | Extended Maturity    
Financing Receivable, Loan Modifications [Line Items]    
Financing Receivable, Modified, Subsequent Default 2.3  
US Government Agency Insured Loans [Member] | Residential Mortgage | Loans to individuals [Member] | Extended Maturity and Interest Rate Reduction    
Financing Receivable, Loan Modifications [Line Items]    
Financing Receivable, Modified in Period, Amount 7.5 7.5
Financing Receivable, Modified, Subsequent Default $ 1.9 $ 5.3