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Investments (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jan. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Schedule of Investments [Line Items] |  |  |  |
Federal Home Loan Bank Stock and Federal Reserve Bank Stock |  | $ 15,400,000 |  | $ 15,500,000
Non-governmental issues exceeding 10% shareholders equity threshold |  | 0 |  | 0
Credit-related investment impairment losses |  | 0 | $ 0 |
Sale of VISA shares |  | 0 | $ 17,837,000 |
Asset Pledged as Collateral |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Carrying value of securities pledged |  | 641,000,000 |  | 644,000,000
Marketable equity securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment securities |  | $ 11,800,000 |  | $ 11,800,000
VISA, Inc. (VISA) |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Sale of VISA shares | $ 17,800,000 |  |  |
VISA, Inc. (VISA) | Common Class B |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Shares of Visa Inc. Class B common shares sold (in shares) | 86,605 |  |  |
VISA, Inc. (VISA) | Marketable equity securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment securities | $ 0 |  |  |
Maximum | First National Corporation (FXNC) |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity ownership positions in the community bank holding companies (percent) |  | 3.70% |  |
Maximum | Eagle Financial Services, Inc. (EFSI) |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity ownership positions in the community bank holding companies (percent) |  | 1.50% |  |

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