(a) In a judicial proceeding, the court may order the production of books, records, and files of a savings bank.
(b) The books, records, and files of a savings bank are not admissible as evidence in any proceeding concerning the validity of a tax assessment or the collection of delinquent taxes, penalties, and interest, unless:
(1) a stockholder or deposit account holder is a proper party to the proceeding, in which event a book, file, or record pertaining to the account of the party is admissible; or
(2) the savings bank is a proper party to the proceeding, in which event a book, file, or record material to the proceeding is admissible.