Tenn. Code Ann. § 45-2-1404

A bank or bank holding company shall be prohibited from acquiring any bank in Tennessee if the bank or bank holding company, including all insured depository institutions that are affiliates of the bank or bank holding company, upon consummation of the acquisition, would control thirty percent (30%) or more of the total amount of the deposits of the insured depository institutions in Tennessee. For purposes of this part, “deposit” has the meaning set forth in § 3(l ) of the Federal Deposit Insurance Act ( 12 U.S.C. § 1813 (l )).