The bank may obtain from any department or agency of the United States or the State or nongovernmental insurer any insurance or guaranty, to the extent available, as to the payment or repayment of interest or principal, or both, or any part of the interest or principal, on any bonds or notes issued by the bank, or on any public utility bonds purchased or held by the bank, pursuant to this chapter; and may enter into any agreement or contract with respect to any insurance or guaranty, except to the extent that the agreement or contract would in any way impair or interfere with the ability of the bank to perform and fulfill the terms of any agreement made with the holders of the bonds or notes of the bank.   [PL 1987, c. 141, Pt. A, §6 (NEW).]