755 ILCS 5/21-2.04
Withdrawable capital accounts, deposits, investment certificates or certificates of deposit of state and federal savings and loan associations but, unless otherwise authorized by a court of competent jurisdiction, only to the extent that the accounts, deposits or certificates are insured by the United States or any of its agencies, and share accounts in federal and state credit unions if the credit unions are insured by the National Credit Union Administration. Amounts invested in a savings and loan association in excess of the amount insured by the United States or any of its agencies shall be secured by a surety bond taken from a surety authorized to transact business in this State in such sum, under such conditions, and with such security sufficient to save the estate from loss.
755 ILCS 5/21-2.04