(1) A farm mutual insurer is not required to file any of its insurance rates with the commissioner. No such rate shall be unfairly discriminatory as between subjects of insurance covered for like perils under like policies and having substantially the same insuring, exposure, and underwriting characteristics.
(2) Notwithstanding any provision of subsection (1) or chapter 18, part 2, of this title, a farm mutual insurer transacting insurance under this chapter may refuse to renew a casualty or liability policy upon nonpayment of dues to the farm mutual insurer if payment of dues is a condition for obtaining or continuing such insurance.