Without regard to the provisions of sections 1864 and 1865 of this title, an insured bank may invest in a bank service company that performs, and a bank service company may perform, the following services only for depository institutions: check and deposit sorting and posting, computation and posting of interest and other credits and charges, preparation and mailing of checks, statements, notices, and similar items, or any other clerical, bookkeeping, accounting, statistical, or similar functions performed for a depository institution