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Investments (Narrative) (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Schedule of Investments [Line Items] |  |  |
Federal Home Loan Bank Stock and Federal Reserve Bank Stock | $ 16,000,000.0 |  | $ 18,500,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses | 0 | $ 0 |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | $ 1,800,000 |  |
Percent of average daily trading volume | 0.20% | 0.20% | 0.20%
Carrying Value of Securities Pledged | $ 467,000,000 |  | $ 510,000,000
Non-Governmental Issues Exceeding 10% Shareholders Equity Threshold | 0 |  | 0
Equity Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Equity Securities, FV-NI | $ 12,000,000.0 |  | $ 11,800,000
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%

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