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Securities (Narrative) (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) Security | Mar. 31, 2019 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
Investments Debt And Equity Securities [Abstract] |  |  |  |
Amortized cost of securities excluding accrued interest | $ 22,800,000 |  |  | $ 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 | 4,800,000,000 |  |  | $ 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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- Definition Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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