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Securities (Narrative) (Details) | Mar. 31, 2023 USD ($) Security | Dec. 31, 2022 USD ($) Security | Mar. 31, 2022 USD ($)
--- | --- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Securities with an aggregate fair value | $ 5,415,262,000 | $ 5,483,762,000 |
Securities available for sale, amortized cost | 6,238,835,000 | 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 | 709 | 757 |
Asset Pledged as Collateral without Right [Member] |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Securities pledged as collateral | $ 6,100,000,000 | $ 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 |  | $ 29,100,000 | $ 28,300,000

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