Except as otherwise provided in G.S. 25-9-340(c), 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 any of the following:
(1) The creation, attachment, or perfection of a security interest in the deposit account.
(2) The bank's knowledge of the security interest.
(3) The bank's receipt of instructions from the secured party.