General (Details) $ in Thousands		1 Months Ended	12 Months Ended
	Jan. 13, 2017	Apr. 20, 2017	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($) Branch
General [Abstract]
Number of branch offices | Branch				18
Subsequent Event [Member]
Business Combinations [Abstract]
Business Acquisition, Name of Acquired Entity		Old Point Mortgage, LLC
Business Acquisition, Transaction Costs				$ 62
Business Acquisition, Date of Acquisition Agreement	Jan. 13, 2017
Business Acquisition, Effective Date of Acquisition		Apr. 20, 2017
Business Combination, Step Acquisition, Equity Interest in Acquiree, Description		On September 10, 2007, the Bank entered into a joint venture agreement with Tidewater Mortgage Services, Inc. (TMSI) to provide mortgage origination services through Old Point Mortgage, LLC (OPM), a joint venture between the Bank and TMSI. Per the terms of the joint venture agreement, TMSI and the Bank owned 51% and 49%, respectively, of OPM, and TMSI was the managing member. The parties’ entry into this joint venture agreement was disclosed in the Company's current report on Form 8-K filed with the Securities and Exchange Commission (SEC) on September 11, 2007. On January 13, 2017, the Bank entered into a membership interest purchase agreement (the Purchase Agreement) with TMSI to purchase TMSI's 51% interest in OPM, with the Bank to be the sole member of OPM upon completion of the purchase. The purchase price was equal to the book value of TMSI’s capital account based on the Financial Statements of the Company as of March 31, 2017. The parties’ entry into the Purchase Agreement was disclosed in the Company's current report on Form 8-K filed with the SEC on January 20, 2017. On April 20, 2017, the Bank completed its purchase of TMSI’s interest in OPM, which terminated the joint venture agreement between TMSI and the Bank and made OPM a wholly-owned subsidiary of the Bank as of that date. OPM's fair value is based on its financials as of March 31, 2017 and was determined by an independent third party. As a result of the fair value calculation, the Company expects to record income of approximately $500 thousand on the purchase in the second quarter of 2017, subject to additional review of the assumptions used in the final valuation report.
Business Combination, Step Acquisition, Equity Interest in Acquiree, Valuation Techniques		Bank's purchase of TMSI's 51% ownership at book value; requirement to record the Bank's 49% ownership at fair value; and estimated reduction in operating expense from the elimination of management fees that were being paid to TMSI and the outsourcing of underwriting and secondary market sales.
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage		100.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage				49.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain			$ 500
Subsequent Event, Description		acquisition of controlling interest in previously-held equity investment