SunTrust Banks Inc., which has already lost hundreds of millions after repurchasing bad mortgages, could have legal costs exceeding $150 million for its mortgage servicing problems.

SunTrust is not alone, as many of the nation's biggest banks continue to rack up new expenses tied to the residential mortgage meltdown. SunTrust lost about $700 million on mortgages in 2011, as it was slammed by its exposure to the Florida market.

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