Shares of Cullen/Frost Bankers (CFR) plummeted 5.20% in Thursday's trading session, despite the company reporting better-than-expected second-quarter earnings. The sharp decline suggests investors may be concerned about the bank's revenue performance and future outlook.

Cullen/Frost reported Q2 earnings per share of $2.39, surpassing the analyst consensus estimate of $2.30. This represents an 8.14% increase from the $2.21 per share earned in the same quarter last year. However, the company's quarterly sales of $546.877 million fell short of the expected $552.535 million, missing estimates by 1.02%.

While the bank showed solid loan growth and a slight increase in average total deposits compared to the first quarter, the revenue miss and potential concerns about the banking sector's overall health may have spooked investors. The market's negative reaction could also indicate worries about the sustainability of Cullen/Frost's growth in a challenging economic environment, despite the company's strong capital ratios and improved net income.