Marling is chairman and chief executive officer of Woodforest Financial Group, Inc., and chief executive officer of Woodforest National Bank. He joined Woodforest in 1989 and has led the community bank from an asset size of $89 million and two locations to its current position as a regional bank with assets of more than $4 billion, 757 branches, and more than 4,800 employees. In 1996, Woodforest opened its first instore branch inside a Walmart store in Conroe. This action led the bank on the beginning of a journey into many more instore banks inside Walmart locations, first in Texas, then North Carolina, Ohio, and eventually into 17 different states.