Iowa Code § 554.9341: Bank’s rights and duties with respect to deposit account.

Except as otherwise provided in section 554.9340, subsection 3, and unless the bank otherwise agrees in a signed record, a bank’s rights and duties with respect to a deposit account maintained with the bank are not terminated, suspended, or modified by:

1. the creation, attachment, or perfection of a security interest in the deposit account;

2. the bank’s knowledge of the security interest; or

3. the bank’s receipt of instructions from the secured party.