Bank where Shawn & Gus talk to Gillian & Clive in episode 5x04 "Chivalry Is Not Dead… But Someone Is".
Source: Psych Forums
Walter retrieves the Massive Dynamic stock certificates from his safety deposit box in episode 3x02 "The Box".
Second bank that Cal Sweeney robs at which the police standoff occurs in episode 1x04 "Cal Sweeney".
Bank that Paulette Chambers visits in episode 1x18 "Save as... John Doe".