When a merger becomes effective:
(a) Unless the surviving depository corporation provided otherwise in the application for approval of the merger or unless the commissioner provided otherwise in the approval of the application:
(1) The surviving depository corporation may establish and maintain a branch office at the head office of the disappearing depository corporation and may establish and maintain equivalent offices at the branch offices, places of business, extensions of offices, and other facilities, if any, of the disappearing corporation.
(2) If the disappearing depository corporation was authorized to transact and was transacting trust business, the surviving depository corporation, if it is a California state bank or savings association, may transact trust business.
(b) The commissioner shall issue to the surviving depository corporation certificates of authority, licenses, and other authorizations as may be necessary to carry out the provisions of subdivision (a).