An institution empowered by law to receive deposits, cash checks or drafts, discount commercial paper,make loans,and issue promissory notes payable to the bearer,known as bank notes. American commercial banks fall into two categories:(1) federally chartered and (2) state chartered. Federally chartered banks come under the regulatory and auditing supervision of the United States Comptroller of the Currency.State-chartered banks come under the control of the appropriate state banking authority.Typically the FDIC will audit state-chartered banks and the comptroller's office will audit federally chartered banks.