For the purposes of this Part, the term officer means a chairman of the board of directors, vice chairman of the board, chairman of the executive committee, president, vice president (except as indicated in the next sentence), cashier, treasurer, secretary, comptroller, and any other person who participates in major policymaking functions. In some institutions (particularly banks or trust companies with officers bearing titles such as executive vice president, senior vice president, or first vice president as well as a number of “vice presidents” ), some or all “vice presidents” do not participate in major policymaking functions, and such persons are not officers for the purpose of this Part.