WASHINGTON — Droves of community banks in the last quarter century have succumbed to earnings volatility, consolidation and heightened regulation. But the period has also produced a substantial number of resilient survivors, new Federal Deposit Insurance Corp. research says.

The FDIC's sweeping study of the community bank sector from 1984 to 2011, which was released Tuesday, highlighted well-known threats facing smaller institutions, while noting that their share of the industry's assets has fallen to 14% from 38%.

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