Bank of the Ozarks Inc. in Little Rock, Ark., reported a 75.5% jump in fourth-quarter earnings from a year earlier, to $16.9 million, including $4.6 million from its fourth failed-bank purchase.

The $3.3 billion-asset company earned 99 cents a share, besting the average of analysts' estimates by 31 cents, according to Thomson Reuters.

Net income for 2010 rose nearly 74% from a year earlier, to $64 million. Government-backed purchases contributed $19 million in income. The net interest margin expanded 46 basis points from a year earlier, to 5.35%.

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