Funds not needed for immediate obligations shall be invested in accordance with state statutes. Authorized investments include: collateralized local bank certificates of deposit, treasuries, government agency securities, Nebraska Liquid Asset Fund, Nebraska Public Agency Investment Trust, commercial paper graded A1 by Standard and Poor’s or P1 by Moody’s, and trusts which invest in U.S. government or agency securities or interests in guaranteed student loans and certificates of deposit insured by the Federal Deposit Insurance Corporation (FDIC).