Citigroup's (C 2.82%) second-quarter profits rose 42%, and shares have been on fire lately. But is this the same Citi from the Great Recession, or is the underlying business stronger?

Motley Fool senior banking analyst Matt Koppenheffer explains how Citi has fortified its balance sheet and how the bank is dealing with a pullback in the refinancing business. With the stock on the rise, Koppenheffer believes there is still room to run.