205 ILCS 305/49

In addition to generally accepted types of security, the endorsement of a note by a surety, comaker or guarantor, or assignment of shares or wages, in a manner consistent with the laws of this State, shall be deemed security within the meaning of this Act. A credit union shall give each surety, guarantor or comaker a copy of the instrument evidencing the indebtedness. The adequacy of any security shall be determined by the credit committee, credit manager or loan officer, subject to this Act and the bylaws of the credit union. The surety, guarantor or comaker may, but need not, be a member of the credit union making the loan.