The Treasurer of State may deposit the money, including trust funds of the State, in any national bank or in any banking institution, trust company, state or federal savings and loan association or mutual savings bank organized under the laws of this State or having a location in the State except as provided in chapter 161. Before making a deposit, the Treasurer of State must consider the rating of the banking institution, trust company, state or federal savings and loan association or mutual savings bank on its most recent assessment conducted pursuant to the federal Community Reinvestment Act, 12 United States Code, Section 2901. When there is excess money in the State Treasury that is not needed to meet current obligations, the Treasurer of State may invest, with the concurrence of the State Controller or the Commissioner of Administrative and Financial Services and with the consent of the Governor, those amounts in bonds, notes, certificates of indebtedness or other obligations of the United States and its agencies and instrumentalities that mature not more than 36 months from the date of investment or in repurchase agreements that mature within the succeeding 12 months that are secured by obligations of the United States and its agencies and instrumentalities that mature within the succeeding 36 months, prime commercial paper, tax-exempt obligations and corporate bonds rated "AAA" that mature not more than 36 months from the date of investment, banker's acceptances or so-called "no-load" shares of an any investment company registered under the federal Investment Company Act of 1940, whose shares are marketed through so-called "no-load" money market mutual funds that maintain a constant share price, only if the investments of the investment company are limited to the securities allowed by this section as amended, that complies with Rule 2a-7 guidelines and maintains a constant share price. The Treasurer of State may participate in the securities loan market by loaning state-owned bonds, notes or certificates of indebtedness of the Federal Government, only if loans are fully collateralized by treasury bills or cash. The Treasurer of State shall seek competitive bids for investments except when, after a reasonable investigation, it appears that an investment of the desired maturity is procurable by the State from only one source. Interest earned on those investments of money must be credited to the respective funds, except that interest earned on investments of special revenue funds must be credited to the General Fund of the State. Effective July 1, 1995, interest earned on investments of the Highway Fund must be credited to the Highway Fund. Interest earned on funds of the Department of Inland Fisheries and Wildlife must be credited to the General Fund. Interest earned on funds of the Baxter State Park Authority must be credited to the Baxter State Park Fund. This section does not prevent the deposit for safekeeping or custodial care of the securities of the several funds of the