Atypically low credit costs will likely provide a strong boost to profits at many of the nation's largest banks again this year. But now analysts are trying to gauge how much ground the bank stocks will give back once these costs return to normal.

At the 50 biggest banks the median gain in earnings due to low credit costs could be 6%, with Shawmut National Corp. enjoying the biggest advantage at 19%, according to Keefe, Bruyette & Woods Inc., New York.

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