A former congressional lawyer turned general counsel at the Federal Deposit Insurance Corp. is leaving the post at the end of this month after more than four years there.

A successor for Charles Yi has not yet been named, an FDIC spokesman said in an email, and it was not immediately clear why Yi is leaving or where he is headed next.

“During Charles' tenure at the FDIC, the agency benefited from his insight, leadership, and past experiences with Congress, the Treasury, the private sector, and the U.S. Army,” FDIC Chairman Jelena McWilliams said in a statement announcing Yi's departure. “He has been involved in numerous rulemakings, enforcement actions, and litigation with a steady focus on the FDIC's mission and mandate. I wish him well in his future endeavors.”

Immediately prior to his appointment as GC at the FDIC in January 2015, Yi served as staff director and chief counsel to the Senate Banking Committee under former Chairman Tim Johnson. At that time, he was the first lawyer to hold the title of FDIC general counsel since May 2012.

On Capitol Hill, Yi became the Senate Banking Committee's chief counsel in 2011 and staff director in 2013, following one year as deputy assistant secretary for banking and finance at the U.S. Department of the Treasury. From 2007 to 2010, he was a staffer on the Senate banking panel and the House of Representatives Financial Services Committee.

Before joining the public sector, Yi, a graduate of Columbia Law School, was an associate at Wilmer Cutler Pickering Hale and Dorr in Washington and Wachtell, Lipton, Rosen & Katz in New York.