Subsequent Events	12 Months Ended
Dec. 31, 2011
Subsequent Events [Abstract]
Subsequent Events	Note 26—Subsequent Events On February 9, 2012, Horizon entered into an Agreement and Plan of Merger (the “Merger Agreement”) providing for Horizon’s acquisition of Heartland Bancshares, Inc., an Indiana corporation (“Heartland”). Pursuant to the Merger Agreement, Heartland will merge with and into Horizon, with Horizon surviving the merger (the “Merger”), and Heartland Community Bank, an Indiana-chartered commercial bank and wholly owned subsidiary of Heartland, will merge with and into a wholly owned subsidiary of Horizon, Horizon Bank, N.A. (“Horizon Bank”), with Horizon Bank as the surviving bank. The boards of directors of each of Horizon and Heartland have approved the Merger and the Merger Agreement. Subject to the approval of the Merger by Heartland’s shareholders, regulatory approvals and other closing conditions, the parties anticipate completing the Merger during the second quarter of 2012. In connection with the Merger, each Heartland shareholder will receive 0.54 shares of Horizon common stock (the “Exchange Ratio”) for each share of Heartland common stock owned by them, subject to adjustment as described below. Based on Horizon’s February 8, 2012 closing price of $18.00 per share as reported on the NASDAQ Global Market, the transaction value is estimated at $14.0 million. The Exchange Ratio may be adjusted in the manner prescribed in the Merger Agreement based upon (i) Heartland’s consolidated shareholder’s equity as of the end of the month prior to closing of the Merger, (ii) the closing of certain commercial loans prior to the closing of the Merger, (iii) a significant decrease in Horizon’s common stock price, and (iv) certain other circumstances specified by the Merger Agreement. The Merger Agreement also provides that prior to the merger Horizon will fund the purchase by either Horizon or Heartland of the shares of preferred stock with an aggregate liquidation value of $7.248 million that Heartland issued to the U.S. Treasury pursuant to the TARP Capital Purchase Program. The Merger Agreement contains other customary representations, warranties, and covenants of Horizon and Heartland. Subject to certain terms and conditions, the board of directors of Heartland has agreed to recommend the approval and adoption of the Merger Agreement to the Heartland shareholders and will solicit proxies voting in favor of the Merger from Heartland’s shareholders. The Merger Agreement also provides for certain termination rights for both Horizon and Heartland, and further provides that upon termination of the Merger Agreement under certain circumstances, Heartland will be obligated to pay Horizon a termination fee.

Subsequent Events

12 Months Ended

Dec. 31, 2011

Note 26—Subsequent Events

On February 9, 2012, Horizon entered into an Agreement and Plan of Merger (the “Merger Agreement”) providing for Horizon’s acquisition of Heartland Bancshares, Inc., an Indiana corporation (“Heartland”). Pursuant to the Merger Agreement, Heartland will merge with and into Horizon, with Horizon surviving the merger (the “Merger”), and Heartland Community Bank, an Indiana-chartered commercial bank and wholly owned subsidiary of Heartland, will merge with and into a wholly owned subsidiary of Horizon, Horizon Bank, N.A. (“Horizon Bank”), with Horizon Bank as the surviving bank.

The boards of directors of each of Horizon and Heartland have approved the Merger and the Merger Agreement. Subject to the approval of the Merger by Heartland’s shareholders, regulatory approvals and other closing conditions, the parties anticipate completing the Merger during the second quarter of 2012.

In connection with the Merger, each Heartland shareholder will receive 0.54 shares of Horizon common stock (the “Exchange Ratio”) for each share of Heartland common stock owned by them, subject to adjustment as described below. Based on Horizon’s February 8, 2012 closing price of $18.00 per share as reported on the NASDAQ Global Market, the transaction value is estimated at $14.0 million.

The Exchange Ratio may be adjusted in the manner prescribed in the Merger Agreement based upon (i) Heartland’s consolidated shareholder’s equity as of the end of the month prior to closing of the Merger, (ii) the closing of certain commercial loans prior to the closing of the Merger, (iii) a significant decrease in Horizon’s common stock price, and (iv) certain other circumstances specified by the Merger Agreement.

The Merger Agreement also provides that prior to the merger Horizon will fund the purchase by either Horizon or Heartland of the shares of preferred stock with an aggregate liquidation value of $7.248 million that Heartland issued to the U.S. Treasury pursuant to the TARP Capital Purchase Program. The Merger Agreement contains other customary representations, warranties, and covenants of Horizon and Heartland.

Subject to certain terms and conditions, the board of directors of Heartland has agreed to recommend the approval and adoption of the Merger Agreement to the Heartland shareholders and will solicit proxies voting in favor of the Merger from Heartland’s shareholders.

The Merger Agreement also provides for certain termination rights for both Horizon and Heartland, and further provides that upon termination of the Merger Agreement under certain circumstances, Heartland will be obligated to pay Horizon a termination fee.