Middlefield Banc Corp. announced that it has completed its merger with Liberty Bank, N.A. Pursuant to the Merger Agreement, as of January 12, 2017, the Board of Directors of the company appointed William A. Valerian, former President and Chief Executive Officer and Chairman of the Board of Liberty Bank, N.A., and Thomas W. Bevan, a former director of Liberty Bank, N.A., to its board of directors.