RCW 62A.9A-341: Bank's rights and duties with respect to deposit account.

Except as otherwise provided in RCW 62A.9A-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: (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.