The protesters who have gathered for weeks near Wall Street and the highly paid investors and analysts in the buildings that surround them don’t agree on much.

But when it comes to the nation’s biggest banks, they have a lot more in common than you would think. Both are deeply frustrated with financial institutions in general and have little faith in the message coming from bank executives.

Earnings season is about to upset one of those groups even more. Never popular to begin with, the nation’s biggest banks are rapidly becoming a focus of public dissatisfaction with the economy, uniting opponents including consumers upset about new fees, protesters who blame the banks for the nation’s economic woes, and lately, Wall Street types who have dumped their bank shares en masse.

For banks, the situation is likely to get worse before it gets better. They are due to begin reporting earnings this week, and the numbers are likely to leave investors as frustrated as ever, making the banks even more desperate to impose new charges on consumers’ accounts and rack up bigger trading profits. Over all, revenue is expected to fall 4 percent in the third quarter, slipping back to 2005 levels, according to data from Trepp. The industry’s earnings are expected to be about what they were in late 2002.