International Bancshares Corporation is a multibank holding company that operates five subsidiary banks providing comprehensive commercial and retail banking services across Texas and Oklahoma. The company serves small- and medium-sized businesses and retail customers through 166 banking facilities, offering deposit accounts, commercial and real estate loans, consumer lending, mortgage services, credit cards, wire transfers, and digital banking platforms, as well as specialized international banking services including letters of credit and foreign-exchange facilitation particularly along the U.S.-Mexico border. The company generates revenue primarily through interest income on loans and deposits, fee income from banking and securities services, and benefits from a substantial cross-border deposit base from Mexican customers and entities that represents a stable and significant portion of total deposits.