Iberiabank (IBKC) in Lafayette, La., has uncovered an accounting error that forced it to restate nearly three years of financial data.

The company misclassified investment and operating income in its cash-flow statements for 2010, 2011 and the first three quarters of last year. In the revision to its financials, filed Wednesday with the Securities and Exchange Commission, Iberiabank reclassified a total of nearly $156 million of what it had called loans receivable as cash provided by operating activities.

Iberiabank does not think the error shows that its auditing procedures and internal controls are flawed, it said in the filing. The changes are "qualitatively immaterial" to its earnings statements and don't affect the company's capital ratios or earnings for the periods, the filing said.

Iberiabank and Ernst & Young, its accounting firm, discovered the mistake earlier this year. The company is conducting an investigation into the matter.

Last quarter, the $13.2 billion-asset company's profit rose 33% from a year earlier, to $23.2 million.

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