205 ILCS 620/1-3
After January 1, 1988, no national bank chartered by the Comptroller of the Currency and having its main office in Illinois or federal savings and loan association or federal savings bank chartered by the Federal Home Loan Bank Board and having its main office in Illinois shall be required to obtain a certificate of authority under this Act or in any manner submit to the regulation or supervision pursuant to this Act, but such national bank, federal savings and loan association or federal savings bank shall only be required to obtain the authority to accept and execute trusts from the particular federal agency which granted its charter, to be exempt from the provisions of this Act. Nothing in this Section 1-3 shall exempt national banks, federal savings and loan associations or federal savings banks whose main offices are located outside of Illinois from compliance with the provisions of Article IV of this Act.
On January 1, 1988, any certificate of authority which has been issued under the provisions of this Act to a national bank, federally chartered savings and loan association or federally chartered savings bank in Illinois shall expire and be of no further force and effect and upon the request of the Commissioner, shall be surrendered.
After January 1, 1988, a State bank that has a certificate of authority under this Act and proposes to convert to a national bank and a State chartered savings and loan association and a State chartered savings bank that has a certificate of authority under this Act and proposes to convert to a federally chartered savings and loan association or federally chartered savings bank, shall notify the Commissioner of such fact and upon obtaining its charter from the relevant federal regulator, shall surrender its certificate of authority issued pursuant to this Act.
205 ILCS 620/1-3