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Loans and Allowances for Credit Losses, Modifications (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Financing Receivable, Loan Modifications [Line Items] |  |
Financing Receivable, Modified in Period, Amount | $ 114.0 | $ 58.0
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 | $ 110.0 |
Healthcare [Member] | Commercial [Member] |  |
Financing Receivable, Loan Modifications [Line Items] |  |
Financing Receivable, Modified in Period, Amount | 90.0 | 37.0
Healthcare [Member] | Commercial [Member] | Extended Maturity and Interest Rate Reduction |  |
Financing Receivable, Loan Modifications [Line Items] |  |
Financing Receivable, Modified in Period, Amount |  | 26.0
General business [Member] | Commercial [Member] |  |
Financing Receivable, Loan Modifications [Line Items] |  |
Financing Receivable, Modified in Period, Amount |  | 10.0
Healthcare, Services and General business member | Extended Maturity |  |
Financing Receivable, Loan Modifications [Line Items] |  |
Financing Receivable, Modified in Period, Amount |  | 20.0
Residential Mortgage [Member] | Loans to individuals [Member] |  |
Financing Receivable, Loan Modifications [Line Items] |  |
Financing Receivable, Modified, Subsequent Default |  | 4.4
Energy [Member] | Commercial [Member] |  |
Financing Receivable, Loan Modifications [Line Items] |  |
Financing Receivable, Modified in Period, Amount | 14.0 |
US Government Agency Insured Loans [Member] | Loans to individuals [Member] | Extended Maturity and Interest Rate Reduction |  |
Financing Receivable, Loan Modifications [Line Items] |  |
Financing Receivable, Modified in Period, Amount | 4.1 | 11.0
US Government Agency Insured Loans [Member] | Residential Mortgage [Member] | Loans to individuals [Member] |  |
Financing Receivable, Loan Modifications [Line Items] |  |
Financing Receivable, Modified in Period, Amount |  | 11.0
Financing Receivable, Modified, Subsequent Default | $ 1.1 | $ 4.3

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