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Securities (Narrative) (Details) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) Security | Jun. 30, 2019 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
Investments Debt And Equity Securities [Abstract] |  |  |  |
Amortized cost of securities excluding accrued interest | $ 23,500,000 |  |  | $ 23,900,000
Securities classified as trading | 0 |  |  | 0
Proceeds from sales of securities | 124,100,000 | $ 0 |  |
Gross gains | 1,100,000 |  |  |
Gross losses | 1,000,000.0 |  |  |
Securities pledged as collateral | 3,300,000,000 |  |  | $ 3,300,000,000
Allowance for credit loss | $ 0 |  | $ 0 |
Securities that met the criteria of a credit loss event | Security | 0 |  |  |

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