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Securities (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) Security | Dec. 31, 2021 USD ($) Security
Debt and Equity Securities, FV-NI [Line Items] |  |
Securities with an aggregate fair value | $ 5,298,921,000 | $ 3,901,659,000
Securities available for sale, amortized cost | 6,380,002,000 | 6,984,530,000
Securities classified as trading | 0 | 0
Securities pledged as collateral | 4,200,000,000 | $ 4,000,000,000.0
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 | 462 | 142
Available for Sale and Held to Maturity [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost of securities excluding accrued interest | $ 25,900,000 | $ 25,500,000
Securities with an aggregate fair value | 561,800,000 |
Unrealized loss | 15,400,000 |
Securities available for sale, amortized cost | $ 561,800,000 |

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