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PENDING BUSINESS COMBINATION Pending Business Combination with MainSource Financial Group | 9 Months Ended
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Sep. 30, 2017
Subsequent Events [Abstract] |
Subsequent Event, Pro Forma Business Combinations or Disposals [Text Block] | PENDING BUSINESS COMBINATION On July 25, 2017, First Financial Bancorp and MainSource Financial Group, Inc. entered into a definitive merger agreement under which MainSource will merge into First Financial in a stock-for-stock transaction. MainSource Bank, a wholly owned subsidiary of MainSource, will merge into First Financial Bank. Under the terms of the merger agreement, shareholders of MainSource will receive 1.3875 common shares of First Financial common stock for each share of MainSource common stock. Including outstanding options and warrants on MainSource common stock, the transaction is valued at approximately $1.0 billion. Upon closing, First Financial shareholders will own approximately 65% of the combined company and MainSource shareholders will own approximately 35%, on a fully diluted basis. The merger will position the combined company to better serve the complimentary geographies of Ohio, Indiana and Kentucky, and create a higher performing bank with greater scale and capabilities. Pro forma information for the periods ended June 30, 2017 and December 31, 2016 was as follows:
| For the six |  | For the year
|  | months ended |  | ended
(Dollars in thousands, except per share data) | June 30, 2017 |  | December 31, 2016
Pro Forma Condensed Combined Income Statement Information
Net interest income |  | $ | 204,518 |  |  | $ | 387,725 |
Provision for loan and lease losses |  | 834 |  |  | 10,140 |
Income before income taxes |  | 92,591 |  |  | 170,132 |
Net income |  | 65,884 |  |  | 119,661 |
|  | As of June 30, 2017 |  |
Pro Forma Condensed Combined Balance Sheet Information |  |  |
Loans and leases, net |  | $ | 8,818,392 |  |  |
Total assets |  | 13,806,092 |  |  |
Deposits |  | 9,987,298 |  |  |
Total shareholders' equity |  | 1,913,682 |  |  |
The merger is expected to close in the first quarter of 2018, subject to approval by the FRB of Cleveland and other customary closing conditions. The selected pro forma financial data included in the preceding table is based on preliminary estimates, and is subject to change upon completion of the merger. On October 19, 2017, the Company filed a registration statement on Form S-4 that included historical and pro forma information required in connection with the merger.

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- Definition The entire disclosure for pro forma information for significant acquisitions or disposals that occurred or are probable to occur after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314020-165662 + Details
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