Wash. Rev. Code § 30B.08.080
(1) Upon the issuance of a certificate of authority to a state trust company as prescribed in this chapter and its commencement of business pursuant to such certificate of authority, it shall be a corporation or limited liability company for the purpose of engaging in trust business under this title, including:
(a) Accepting or executing trusts, including:
(3) Pursuant to such certificate of authority, a state trust company may also perform incidental activities, other than trust business, which include:
[ 2019 c 389 s 10; 2014 c 37 s 329.]