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Short-Term Debt and Long-Term Debt (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Financing receivables	$ 2,691,091,000	$ 2,996,259,000
Securities pledged as collateral	$ 0	0
Maximum ratio of debt to total assets under debt covenant	50.00%
Maximum total debt under debt covenant	$ 1,640,000,000
Outstanding Borrowings	0	0
Federal Home Loan Bank Borrowings [Member]
Debt Instrument [Line Items]
Additional funding	382,400,000
Federal Reserve Discount [Member]
Debt Instrument [Line Items]
Additional funding	198,700,000
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Borrowings [Member]
Debt Instrument [Line Items]
Financing receivables	1,500,000,000	1,400,000,000
Asset Pledged as Collateral [Member] | Federal Reserve Discount [Member]
Debt Instrument [Line Items]
Financing receivables	$ 350,000,000.0	$ 546,700,000

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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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