While Fools should generally take the opinion of Wall Street with a grain of salt, it's not a bad idea to take a closer look at particularly stock-shaking analyst upgrades and downgrades -- just in case their reasoning behind the call makes sense.

What: Shares of Bank of America (NYSE:BAC) gained 1.6% today after Deutsche Bank upgraded the banking gorilla from hold to buy.

So what: Along with the upgrade, analyst Matt O'Connor boosted his price target to $18 (from $16.50), representing about 15% worth of upside to yesterday's close. So while momentum traders might be turned off by Bank of America's price weakness in recent months, O'Connor's call could reflect a sense on Wall Street that the concerns surrounding its growth trajectory are becoming overblown.

Now what: According to Deutsche, Bank of America's risk/reward trade-off is rather attractive at this point. "We think the most meaningful negative catalysts have been identified and largely priced in," said O'Connor. "From here, Bank of America is well-levered to a potential pickup in capital markets revenues, higher interest rates, and an improving US economy." When you couple that upbeat outlook with Bank of America's cheapish price-to-book of 0.8, it's tough to disagree with Deutsche's bullishness. 

Brian Pacampara owns shares of Bank of America. The Motley Fool recommends Bank of America. The Motley Fool owns shares of Bank of America. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.