With his father's mining proceeds, Orra Monnette began purchased stock in Los Angeles area banks. Eventually, this led to a controlling interest in the American National Bank of Los Angeles (ANB). In 1909, ANB was merged into Citizens Trust and Savings Bank of Los Angeles. In 1911, Monnette purchased the Broadway Bank and Trust Company, which when merged with the family's other holdings formed the Citizens Bank and Trust Company, of which Orra E. Monnette was Chairman of the Board. Monnette left Citizens in 1922.