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Investments (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Schedule of Investments [Line Items] |  |  |
Percent Of Average Daily Trading Volume | 0.20% |  | 0.20%
Credit-related net investment impairment losses | $ 0 | $ 0 | $ 0
Carrying value of securities pledged | 274,000,000 |  | 273,000,000
Other Than Temporary Impairment Credit Losses Recognized In Earnings | $ 18,200,000 |  | $ 18,170,000
First National Corporation (FXNC) [Domain] | Maximum [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Equity ownership positions in the community bank holding companies | 4.00% |  | 4.00%
Eagle Financial Services, Inc. (EFSI) [Domain] | Maximum [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Equity ownership positions in the community bank holding companies | 1.50% |  | 1.50%
Debt Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings | $ 16,600,000 |  | $ 16,586,000
Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings | $ 1,600,000 |  | $ 1,584,000

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