Loans to directors or officers.

Loans, other than through the purchase of bonds, debentures, or similar obligations of the type customarily sold in public offerings, or through ordinary deposit of funds in a bank, may not be made by a corporation to its directors or officers, or to any other corporation, firm, association, or other entity in which one or more of its directors or officers is a director or officer or holds a substantial financial interest, except a loan by one corporation which is exempt from federal income taxation under s. 501(c)(3) of the Internal Revenue Code of 1986, as amended, to another corporation which is exempt from federal income taxation under s. 501(c)(3) of the Internal Revenue Code of 1986, as amended. A loan made in violation of this section is a violation of the duty to the corporation of the directors or officers authorizing it or participating in it, but the obligation of the borrower with respect to the loan is not affected.