Despite surprising the market and beating analysts' expectations, not everything in the Citigroup (C 1.38%) earnings report was wildly positive. While the bank showed strong performance in its markets and investment banking divisions, the firm's transaction services group appears to be suffering.

In this video, Motley Fool banking analyst David Hanson tells investors why this segment is important to the bank's overall strategy and if its performance will weigh the stock down in the future.