(a) In general.--Any interest-bearing obligation, including bonds, notes, debentures, and car-trust certificates, issued, guaranteed, or assumed by, a corporation organized under the laws of the United States, of any commonwealth or state thereof, or of the District of Columbia, shall be an authorized investment if purchased or retained in the exercise of that degree of judgment and care, under the circumstances then prevailing, which men of prudence, discretion and intelligence exercise in the management of their own affairs, not in regard to speculation, but in regard to the permanent disposition of their funds, considering the probable income to be derived therefrom as well as the probable safety of their capital.
(b) Definition.--As used in this section "corporation" shall include a voluntary association, a joint-stock association or company, a business trust, a Massachusetts trust, a common-law trust, a municipal or quasi-municipal corporation by whatever name called, and any other organization organized and existing for any lawful purpose and which, like a corporation, continues to exist notwithstanding changes in the personnel of its members or participants, and conducts its affairs through a committee, a board, or some other group acting in a representative capacity.