It shall be unlawful:
(1) Until July 1, 1989, for any bank holding company or subsidiary thereof to open for business any bank not now opened for business whether or not a charter, permit, license, or certificate to open for business has already been issued.
(2) For any company to become a bank holding company unless the primary purpose of the corporation is the ownership or control of one or more banks.
(3) For any bank holding company, subsidiary, or employee thereof to engage in any insurance activity except an insurance activity authorized by R.S. 6:242. However, any bank holding company or subsidiary thereof which was engaged as a general insurance agent, or broker on January 1, 1984, may continue to be so engaged.