A deposit is a special deposit if it is:
(1) A deposit of funds in a bank under an account agreement;
(2) For the benefit of at least two beneficiaries, one or more of which may be a depositor;
(3) Denominated in a medium of exchange that is currently authorized or adopted by a domestic or foreign government;
(4) For a permissible purpose stated in the account agreement; and
(5) Subject to a contingency.