The Division of Banks regulates Washington State-chartered Banks, Trust Companies, Small Business Administration 7(a) Lenders, and some Non-US (Alien) Banks. Empower a trusted representative with an Authorization Letter.Make a free Authorization Letter in minutes with our customizable template. Contact your bank for a power of attorney form. Please complete all fields in this section. Account Name(s) (e.g. Body of the letter: Declare what is being authorized and to whom the authorization is being granted. Need a letter of authority from a bank? Authorization letters are formal letters that empower somebody else to take actions on your behalf. The Act completely replaces Washington's current law and has some key differences that need to be considered when a bank accepts a power of attorney.