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Concentrations of Credit Risk	12 Months Ended
Concentrations of Credit Risk	Dec. 31, 2017
Risks and Uncertainties [Abstract]
Concentrations of Credit Risk	Concentrations of Credit Risk Substantially all of the Company's loans are made within its market area, which includes Southern and Central Virginia and the northern portion of Central North Carolina. The ultimate collectibility of the Company's loan portfolio and the ability to realize the value of any underlying collateral, if necessary, are impacted by the economic conditions and real estate values of the market area. Loans secured by real estate were $1,080,031,000, or 80.8% of the loan portfolio at December 31, 2017, and $951,073,000, or 81.6% of the loan portfolio at December 31, 2016. Loans secured by commercial real estate represented the largest portion of loans at $637,701,000 at December 31, 2017 and $510,960,000 at December 31, 2016, 47.7% and 43.9%, respectively of total loans. There were no concentrations of loans to any individual, group of individuals, business, or industry that exceeded 10% of total loans at December 31, 2017 or 2016.