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Securities (Narrative) (Details) | Dec. 31, 2025 USD ($) Security | Dec. 31, 2024 USD ($) Security
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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

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