Securities (Narrative) (Details)	Dec. 31, 2025 USD ($) Security	Dec. 31, 2024 USD ($) Security
Debt and Equity Securities, FV-NI [Line Items]
Securities with an aggregate fair value	$ 4,226,864,000	$ 4,608,320,000
Securities available for sale, amortized cost	6,341,322,000	5,774,133,000
Securities classified as trading	0	$ 0
Allowance for credit loss	$ 0
Securities that met the criteria of a credit loss event \| Security	0
Number of securities with market values below their cost basis \| Security	604	729
Asset Pledged as Collateral without Right [Member]
Debt and Equity Securities, FV-NI [Line Items]
Securities pledged as collateral	$ 3,900,000,000
Available for Sale and Held to Maturity [Member]
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost of securities excluding accrued interest	$ 31,700,000	$ 29,800,000

Available for sale securities amortized cost excluding accrued interest.

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Amount of allowance for credit loss of accounts and financing receivables. Includes, but is not limited to, notes and loan receivable.

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