1. A method for associating documents, comprising: providing a plurality of scanned documents of different types of transactions; identifying a transaction type for each scanned document by comparing a determined pattern for each scanned document to known document patterns associated with transaction types; extracting first and second metadata values from each scanned document using metadata labels, wherein different metadata labels are used according to transaction type; identifying each scanned document using the first metadata values; associating a stored electronic record with each scanned document by employing the first metadata values such that a relationship between the stored electronic record and the associated scanned document is determined and stored, wherein associating includes extracting at least one parameter from the stored electronic record to map the stored electronic record to the scanned document having first metadata values matching the at least one parameter; and verifying the relationship between the stored electronic record and the associated scanned document by employing the second metadata values.