Loans and Allowances for Credit Losses, Modifications (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Financing Receivable, Loan Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 3.3	$ 52.0
Financing Receivable, Modified, Subsequent Default	$ 6.4
Number of Days Past Due Following Modification to be Considered a Payment Default	30 days
Loans to individuals [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Loan Modifications [Line Items]
Financing Receivable, Modified in Period, Amount		1.8
Healthcare, Services and General business member | Extended Maturity
Financing Receivable, Loan Modifications [Line Items]
Financing Receivable, Modified in Period, Amount		51.0
Healthcare [Member] | Commercial [Member]
Financing Receivable, Loan Modifications [Line Items]
Financing Receivable, Modified in Period, Amount		47.0
US Government Agency Insured Loans [Member] | Residential Mortgage [Member] | Loans to individuals [Member]
Financing Receivable, Loan Modifications [Line Items]
Financing Receivable, Modified, Subsequent Default		$ 4.2
US Government Agency Insured Loans [Member] | Residential Mortgage [Member] | Loans to individuals [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Loan Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 2.6
Financing Receivable, Modified, Subsequent Default	$ 5.9