Lafayette-based IberiaBank Corp. reported fourth-quarter earnings of $17 million, or 59 cents per share, a 33 percent increase over the $12.8 million, or 49 cents per share, earned a year ago.

IberiaBank’s earnings included after-tax costs of $4 million, or 10 cents per share, related to the acquisition and conversion of Omni Bancshares Inc. and Cameron Bancshares Inc. Without those costs, IberiaBank would have had earnings per share of $21 million, or 69 cents per share.

Stock analysts surveyed by Thomson Reuters had forecast earnings of 65 cents per share for the quarter and $2.02 for the year.

For the year, IberiaBank earned $53.5 million, or $1.87 per share, compared to $47.8 million, or $2.11 per share. The 2011 earnings included acquisition-related expenses of 41 cents per share.

In a news release, President and Chief Executive Officer Daryl G. Byrd said the company is optimistic about its prospects for 2012, when the company will celebrate its 125th anniversary on March 12.