Bank of America's profitable mortgage business in 4th quarter 2012 with over $1 billion in revenue. Bank of America worked with its own customers to tighten oversight and turned down mortgage purchases from other banks. Lending to borrowers under the government HARP program was more profitable. As refinancings under the HARP program shrink from the 800,000 reached in the first ten months of 2012, the revenues and margins are likely to decline, say analysts.