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Loans and Allowances for Credit Losses, Modifications (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Financing Receivable, Loan Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 57.6
Number of Days Past Due Following Modification to be Considered a Payment Default	30 days
Residential mortgage [Member] | Loans to individuals [Member]
Financing Receivable, Loan Modifications [Line Items]
Financing Receivable, Modified, Subsequent Default	$ 4.4
Healthcare [Member] | Commercial [Member]
Financing Receivable, Loan Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	36.9
General business [Member] | Commercial [Member]
Financing Receivable, Loan Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	9.5
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	10.7
Financing Receivable, Modified, Subsequent Default	$ 4.3

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