Truncating bank (Check 21)

Definition
A truncating bank (Check 21) is

"[t]he financial institution that truncates the original check. If a person other than a financial institution truncates the original check, the truncating bank is the first financial institution that transfers, presents, or returns, in lieu of such original check, a substitute check or, by agreement with the recipient, information relating to the original check (including data taken from the MICR line of the original check or an electronic image of the original check), whether with or without the subsequent delivery of the original check."