For purposes of this chapter, the following words are defined as:

(1) "Fiduciary powers" means the power to act in any fiduciary capacity authorized by the state of Washington including, but not limited to, trustee, executor, administrator, registrar of stocks and bonds, guardian of estates, assignee, receiver, agent, custodian, investment adviser, if the trust company receives a fee for its investment advice, escrow agent, corporate bond paying and transfer agent, escrow holder, managing agent, depositary, committee of estates of incompetents, and any capacity in which the trust company possesses investment discretion on behalf of another.

(2) "Trust department" means that group or groups of officers and employees of a trust company organized under the supervision of officers or employees to whom are designated by the board of directors the performance of the fiduciary responsibilities of the trust company, whether or not the group or groups are so named.

(3) "Agency" means the fiduciary relationship in which title to the property constituting the agency does not pass to the trust institution but remains in the owner of the property, who is known as the principal, and in which the agent is charged with certain specific duties with respect to the property.

(4) "Agency coupled with an interest" means an agency in which the agent has a legal interest in the subject matter. Such an agency is not terminated automatically, as are other agencies, by the death of the principal but continue in effect until the agent can realize upon its legal interest.

(5) "Managing agent" means the fiduciary relationship assumed by a trust company upon the creation of an account which names the trust company as agent and confers investment discretion upon the trust company.

(6) "Trust company" as used herein shall also include banks which are authorized to exercise trust powers.