The following rules govern priority among conflicting security interests in the same deposit account:

(1) A security interest held by a secured party having control of the deposit account under RCW 62A.9A-104 has priority over a conflicting security interest held by a secured party that does not have control.

(2) Except as otherwise provided in [subsections] (3) and (4) of this section, security interests perfected by control under RCW 62A.9A-314 rank according to priority in time of obtaining control.

(3) Except as otherwise provided in [subsection] (4) of this section, a security interest held by the bank with which the deposit account is maintained has priority over a conflicting security interest held by another secured party.

(4) A security interest perfected by control under RCW 62A.9A-104(a)(3) has priority over a security interest held by the bank with which the deposit account is maintained.