Career
He played college football for the Mississippi State Bulldogs. NFL
In 2003, he signed as an undrafted rookie with the Miami Dolphins of the National Football League. He was waived after training camp on August 31, 2003.
The Dolphins put him on waivers and he was assigned to the practice squad on November 11.
On November 24, he was released by the Dolphins. Miami re-signed him on December 31, 2003 and he played in their last two games.
Ottawa Renegades
He was acquired by the Ottawa Renegades in a late season trade in 2004 after spending time on the Edmonton Eskimos" practice roster. Edmonton traded their first and second picks in the 2005 Canadian Football League Draft, along with Banks, to Ottawa in exchange for Clinton Wayne and Patrick Kabongo.
In 2004, he had seven tackles in three games for Ottawa.
Korey had an outstanding 2005 season with a league-leading 10 interceptions, two touchdowns, 44 tackles, 12 pass knockdowns, two forced fumbles and one fumble recovery. He was the Renegades" nominee for Most Outstanding Defensive Player and was named a 2005 Canadian Football League All-Star. British Columbia Lions
When the Renegades were suspended after the 2005 season, Banks was drafted in the first round, 6th overall, by the British Columbia Lions in the 2006 Ottawa Renegades Dispersal Draft.
He has since been named a Canadian Football League All-Star in 2006, 2009, 2011 and 2012 as well as a West Division All-Star from 2006–2011.
Following the 2013 Canadian Football League season Banks entered his optional year of his contract, he expressed his desire to negotiate a new contract extension at an increased salary to what his option year salary would pay him. The British Columbia Lions refused to grant Banks a contract extension.
Winnipeg Blue Bombers
On January 31, 2014, Banks was traded to the Winnipeg Blue Bombers in exchange for non-import wide receiver Kito Poblah. On February 19, 2014, the Bombers signed Banks to a contract extension through the 2015 Canadian Football League season.
