The executive director shall manage and conduct the business and affairs of the bank, the infrastructure bank fund, and guarantee trust fund, subject to the direction of the board. Except as otherwise provided in this section, the board may assign to the executive director, by resolution, those duties generally necessary or convenient to carry out its powers and purposes under this chapter. Any action involving final approval of any bonds, notes, or loans shall require the approval of a majority of the members of the board. Subject to any conditions that the board may from time to time prescribe, the executive director may exercise any power, function, or duty conferred by law on the bank in connection with the administration, management, and conduct of the business and affairs of the bank, the infrastructure bank fund, and the guarantee trust fund.