(a) With the approval in writing of the Secretary, which approval shall state that the proposed sale is, in his opinion, necessary for the protection of the depositors and other creditors, any savings bank that is an eligible depository institution, as defined in § 2 of the Illinois Banking Act may, by a vote of a majority of its board of directors and without a vote of its members or stockholders, sell all or any part of its assets to another savings bank or depository institution or to the Federal Deposit Insurance Corporation, provided that a savings bank or depository institution assumes in writing all of the liabilities of the selling savings bank.
     (b) Notwithstanding any other provisions of this Act, a savings bank may sell to any savings bank or depository institution an insubstantial portion of its total deposits. The sale of an insubstantial portion of a savings bank’s deposits may be by vote of a majority of the board of directors, and, with approval of the Secretary, without a vote of its members or stockholders.