1. A document processing device configured to process a stack of documents including currency bills and checks, the device comprising: a transport system configured to convey documents including currency bills and checks along a transport path past an image scanner, the image scanner configured to obtain an image of each conveyed currency bill and check, the obtained images reproducible for electronic display; one or more processing units configured to control communication of obtained images of conveyed checks to a communication port, to determine the denominations of the currency bills from the obtained images of the conveyed currency bills, and to extract a check account number and bank identification information from the obtained images of the conveyed checks.