NEW YORK — Former Merrill Lynch CEO John Thain, who brokered the investment bank's controversial sale to Bank of America, is taking over as chairman and CEO of CIT Group as the commercial lender continues to restructure its business following a brief stay in bankruptcy protection.

CIT Group, one of the nation's largest lenders to small and mid-sized businesses, said Thain will take the helm immediately. The 54-year-old replaces acting interim CEO Peter Tobin, who will remain on CIT's board.

As chairman and CEO of Merrill Lynch, Thain's deal to sell Merrill was considered a lifesaving move for the company at the height of the financial crisis. But he then came under fire for having paid out $3.6 billion in bonuses to Merrill employees just before the deal closed, and for spending more than $1 million to redecorate his office at Merrill, despite its massive losses.