Commitments and Contingencies (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Off-balance Sheet Risks [Abstract]
Commitments to extend credit	$ 193,508	$ 144,113
Home Equity Lines of Credit [Member]
Fair Value, Off-balance Sheet Risks [Abstract]
Commitments to extend credit	71,545	56,486
Commercial Real Estate, Construction and Development Loans Committed but not Funded [Member]
Fair Value, Off-balance Sheet Risks [Abstract]
Commitments to extend credit	33,166	19,526
Other Lines of Credit (Principally Commercial) [Member]
Fair Value, Off-balance Sheet Risks [Abstract]
Commitments to extend credit	88,797	68,101
Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks [Abstract]
Commitments to extend credit	$ 3,831	$ 3,331