North American Development Bank Improvement and General Capital Increase Authorization Act of 2017 This bill authorizes the Department of the Treasury to subscribe to 150,000 additional shares of the capital stock of the North American Development Bank. The U.S. government shall support the financing of projects related to: natural gas, including natural gas pipelines and combined cycle power plants, with major emphasis on cross-border energy distribution and consumption and the energy security of the United States and Mexico; and the expansion or new construction of international land border crossings to facilitate the the flow of goods and people across the U.S.-Mexico border while reducing wait times and improving air quality related to vehicular and commercial traffic pollution. The U.S. government shall also require the bank to develop and implement: efficiency improvements to streamline and accelerate the bank's project certification and financing process, and performance measures that demonstrate how the bank's approved projects and financing are meeting its mission and providing value to the U.S.- Mexico border region.