Zions Bancorporation is a financial holding company. The Company conducts its banking operations through separately managed and branded segments, including Zions Bank, Amegy Bank, California Bank & Trust, National Bank of Arizona, Nevada State Bank (NSB), Vectra Bank Colorado, The Commerce Bank of Washington (TCBW) and Other. It focuses on providing community banking services through its business lines, including small and medium-sized business and corporate banking; commercial and residential development, construction and term lending; retail banking; treasury cash management and related products and services; residential mortgage servicing and lending; trust and wealth management; limited capital markets activities, including municipal finance advisory and underwriting, and investment activities. It provides a range of banking and related services, primarily in Arizona, California, Colorado, Idaho, Nevada, New Mexico, Oregon, Texas, Utah, Washington and Wyoming.