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Securities (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) Security | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) Security
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Securities with an aggregate fair value | $ 4,256,312,000 |  | $ 4,276,643,000
Securities available for sale, amortized cost | 5,535,212,000 |  | 5,496,718,000
Securities classified as trading | 0 |  | $ 0
Sales of securities | 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 | 727 |  | 698
Asset Pledged as Collateral without Right [Member] |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Securities pledged as collateral | $ 4,200,000,000 |  | $ 4,700,000,000
Available for Sale and Held to Maturity [Member] |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Amortized cost of securities excluding accrued interest | $ 28,800,000 |  | $ 27,400,000

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