(1) The selling and purchasing banks shall enter into an agreement that must contain all the terms and conditions of the sale and that must contain:
(a) proper provision for the assumption, payment, transfer, or retention of all the liabilities of the selling bank as to the branch assets and business sold;
(b) proper provision for the assumption, payment, transfer, or retention of the purchasing bank of all fiduciary obligations of the branch or branch business sold.
(2) The agreement for purchase and sale of a state bank must be authorized and approved by the department. The agreement of purchase and sale of a national bank must be in accordance with the laws applicable to national banks.