N.D. Cent. Code § 6-08-30
No financial institution or financial institution holding company may acquire direct or indirect ownership or control of more than twenty-five percent of North Dakota deposits through the direct or indirect acquisition of an interest in, ownership of, or control over another financial institution in this state. No financial institution or financial institution holding company may purchase the assets and assume the liabilities of a banking house or facility of any financial institution located in this state if the consummation of the acquisition results in the acquiring financial institution or financial institution holding company having direct or indirect interest in, ownership of, or control over more than twenty-five percent of North Dakota deposits. No financial institution may establish a facility outside the corporate city limits of the location of the main banking house or any authorized facility if the financial institution or its financial institution holding company has a direct or indirect interest in, ownership of, or control over more than twenty-five percent of North Dakota deposits. For purposes of this chapter, "North Dakota deposits" means North Dakota deposits as that term is defined in section 6-08.3-01.
N.D.C.C. § 6-08-30