East West Bank 1132 S Diamond Bar Blvd, Diamond Bar, CA91765 This branch of East West Bank is located in the middle of a large shopping plaza that's anchored by Ralph's supermarket.…More Ample parking is available out front. To the right of the entrance, a night depository slot is provided. Inside, East West specializes in serving the Chinese American community. Walk-up teller windows offer personalized service. Sit-down service is also available. Should there be a wait, East West has a seating area. Complimentary coffee can be found on the back counter.