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The bank was founded as Chino Valley Bank in 1974.
In 2018, Citizens acquired Pasadena-based Community Bank, which was founded in 1945. In 1995, the company acquired Citizens Commercial Trust and Savings Bank, also of Pasadena. In 1994, the company assumed the operations of the failed Pioneer Bank of Fullerton, California.
Citizens Business Bank was the former name sponsor of the Toyota Arena in Ontario, California between the arena's opening in 2008 and 2019.