Investments (Narrative) (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Schedule of Investments [Line Items]
Loans, evaluated for impairment, individually	$ 1,000,000
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	23,600,000
Non-governmental issues exceeding 10% shareholders equity threshold	0	$ 0
Allowance for credit loss	0	0
Asset Pledged as Collateral
Schedule of Investments [Line Items]
Carrying value of securities pledged	689,000,000	$ 694,000,000
Marketable equity securities
Schedule of Investments [Line Items]
Investment securities	$ 6,200,000