Company Description. Granger National Bank, established in 1920, is the oldest banking institution in Granger, TX. The bank building was constructed in 1924 and has stood the test of time surviving the stock market crash in 1929. Locally owned and operated, Granger National Bank offers agricultural, commercial, and consumer lending services. The bank celebrated its centennial year in 2020 and is insured by the Federal Deposit Insurance Corporatio...