Section 79. If the commissioner has taken possession of a credit union as provided for in sections twenty-two to twenty-six, inclusive, of chapter one hundred and sixty-seven or a credit union is in the possession of the Massachusetts Share Insurance Corporation and it is determined by the commissioner and the insurer that it is in the best interests of the depositors, shareholders and insurer, a merger as provided for in section seventy-eight may be effected without regard to geographical limitations within the commonwealth.