An early rally in financial exchange traded funds waned Thursday along with optimism over a deal in which billionaire investor Warren Buffett placed a $5 billion bet on Bank of America (NYSE: BAC).

The obvious question is whether Buffett’s coveted “seal of approval” on Bank of America will be enough to turn around the fortunes of beaten-down financial ETFs. [Financial ETFs Pare Gains After Buffett’s B. of A. Move]

Buffett, chief executive of Berkshire Hathaway, often negotiates tough deals with companies that need large, fast capital infusions. The Bank of America deal announced Thursday initially boosted sentiment, but large banks are still facing a troubled economy, tougher regulations and potential hits from mortgage-related lawsuits.

“Berkshire’s investment in Bank of America reduced concerns over BAC’s liquidity/funding/confidence and capital to a lesser extent. These actions should also reduce some of the overhang for the group overall — as bank stocks have likely suffered from concerns surrounding a bank as big and as important as BAC,” wrote Deutsche Bank analysts in a note Thursday. “However, these actions don’t necessarily address the longer-term capital uncertainty at BAC, and underlying [earnings]power may prove to be much less than many expect.”

Banking shares have been pummeled in August, with B. of A. down more than 40% over the last four weeks, reports Brian O’Connell for Time. However, financial stocks began gaining some traction after noted analyst Meredith Whitney’s comments on Bank of America earlier this week.

On Wednesday, Meredith Whitney told Bloomberg that Bank of America was doing better than what the markets believed, noting that CEO Brian Moynihan is the “right guy for the job.”

“Banks have continued to make gradual but steady progress in recovering from the financial market turmoil and severe recession that unfolded from 2007 through 2009,” remarked FDIC acting chairman Martin Gruenberg, in the report.

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