Bank of South Carolina Corp. in Charleston posted a 6% year-over-year increase in second-quarter net earnings, largely because of a wide net interest margin spread.

The $262.6 million-asset bank said net income rose to $728,842, or 18 cents a share, from $687,461, or 17 cents a share, in the second quarter of 2009.

The bank's president, Hugh C. Lane Jr., said in a press release Friday that earnings exceeded projections as a result of the net interest margin remaining above 4%.

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