Okla. Stat. tit. 18, § 381.58
All contracts of an association for the loan of money shall be subject to the laws of this state with respect to maximum interest rates which may be charged and to the penalties for violation thereof, regardless of the fact that the obligors are members of the association.
Laws 1970, HB 1543, c. 101, § 58, emerg. eff. June 1, 1970.