1. A method, comprising: performing optical character recognition (OCR) on an image of a financial document and at least one of: correcting OCR errors in the financial document using at least one of textual information from a complementary document and predefined business rules; normalizing data from the complementary document using at least one of textual information from the financial document and the predefined business rules; and normalizing data from the financial document using at least one of textual information from the complementary document and the predefined business rules.