Mo. Rev. Stat. § 369.239
369.239 Association may accept pledge of borrower's account or other additional ...
369.239. Association may accept pledge of borrower's account or other additional collateral. — As additional collateral security for a loan, an association may accept the assignment or pledge of the account or accounts of the borrower or of any other account owner, or additional collateral of any kind.
(L. 1971 S.B. 3 § 47, A.L. 1983 H.B. 570)