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Securities (Narrative) (Details) | Jun. 30, 2023 USD ($) Security | Dec. 31, 2022 USD ($) Security
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Securities with an aggregate fair value | $ 5,354,489,000 | $ 5,483,762,000
Securities available for sale, amortized cost | 6,151,183,000 | 6,310,214,000
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 | 769 | 757
Asset Pledged as Collateral without Right [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Securities pledged as collateral | $ 4,700,000,000 | $ 4,900,000,000
Available for Sale and Held to Maturity [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost of securities excluding accrued interest | $ 28,700,000 | $ 29,100,000

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