Whenever voluntary liquidation is approved by the director or the sale and transfer of the assets of any state trust company is approved by the director pursuant to this chapter, a certified copy of such approval, filed in the office of the secretary of state, shall authorize the cancellation of the certificate of authority of such state trust company, subject, however, to its continued existence, as either a general corporation under Title 23B RCW or a general limited liability company under chapter 25.15 RCW.