C.R.S. § 4-9-340

(a) Except as otherwise provided in subsection (c) of this section, a bank with which a deposit account is maintained may exercise any right of recoupment or set-off against a secured party that holds a security interest in the deposit account. (b) Except as otherwise provided in subsection (c) of this section, the application of this article to a security interest in a deposit account does not affect a right of recoupment or set-off of the secured party as to a deposit account maintained with the secured party. (c) The exercise by a bank of a set-off against a deposit account is ineffective against a secured party that holds a security interest in the deposit account which is perfected by control under section 4-9-104 (a)(3), if the set-off is based on a claim against the debtor.