International Bancshares Corporation is a financial holding company. The Company, through its subsidiaries, is primarily engaged in the business of banking, including the acceptance of checking and savings deposits, and the making of commercial, real estate, personal, home improvement, automobile, and other installment and term loans. The primary markets of the Company are South, Central and Southeast Texas, an area bordered on the east by the Galveston area, to the northwest by Round Rock, to the southwest by Del Rio and to the southeast by Brownsville, as well as the State of Oklahoma. Its banking subsidiaries facilitate international trade along the United States' border with Mexico and elsewhere. The Bank's subsidiaries primarily focus on providing commercial banking services to small and medium sized businesses located in their trade areas. The Company's bank subsidiaries include International Bank of Commerce (IBC); Commerce Bank, and International Bank of Commerce, Zapata.