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Investments (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |  |  |
Federal Home Loan Bank Stock and Federal Reserve Bank Stock | $ 15,600,000 |  | $ 15,600,000 |  | $ 15,900,000
Non-governmental issues exceeding 10% shareholders equity threshold | 0 |  | 0 |  | 0
Held-to-maturity securities in an unrealized loss position |  |  |  |  | 0
Credit-related investment impairment losses |  |  | 0 | $ 0 |
Sale of VISA shares | 0 | $ 0 | 17,837,000 | $ 0 |
Asset Pledged as Collateral |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Carrying value of securities pledged | 618,000,000 |  | 618,000,000 |  | 519,000,000
Marketable equity securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investment securities | $ 10,900,000 |  | 10,900,000 |  | 12,600,000
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 |  | 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) | 4.00% |  | 4.00% |  | 4.00%
Maximum | Eagle Financial Services, Inc. (EFSI) |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Equity ownership positions in the community bank holding companies (percent) | 1.50% |  | 1.50% |  | 1.50%

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