National Bank of Arizona is not a separate corporate entity from Zions Bancorporation, but rather operates as a division and wholly-owned subsidiary of Zions Bancorporation, N.A. While National Bank of Arizona maintains its own distinct local brand identity, leadership, and community-focused banking services tailored specifically to Arizona customers, it functions under the overarching regulatory and financial umbrella of Zions Bancorporation. This multi-bank holding company model allows regional institutions like the National Bank of Arizona to leverage the financial strength, technological infrastructure, and resources of the broader parent corporation while preserving localized customer service and community relationships.