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Investments (Narrative) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Schedule of Investments [Line Items] |  |  |
Credit-related net investment impairment losses | $ 0 | $ 0 |
Percent of average daily trading volume | 0.20% | 0.20% | 0.20%
Equity Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Equity Securities, FV-NI | $ 10,400,000 |  | $ 10,300,000
Credit-related investment impairment losses recognized in earnings | 1,800,000 |  |
Federal Home Loan Bank Certificates and Obligations (FHLB) |  |  |
Schedule of Investments [Line Items] |  |  |
Securities Owned Not Readily Marketable | $ 15,800,000 |  | $ 18,500,000
Maximum | First National Corporation (FXNC) |  |  |
Schedule of Investments [Line Items] |  |  |
Equity ownership positions in the community bank holding companies | 4.00% |  | 4.00%
Maximum | Eagle Financial Services, Inc. (EFSI) |  |  |
Schedule of Investments [Line Items] |  |  |
Equity ownership positions in the community bank holding companies | 1.50% |  | 1.50%
Asset Pledged as Collateral |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Securities, Available-for-sale, Restricted | $ 462,000,000 |  | $ 510,000,000

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