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BUSINESS COMBINATION Business Combination with MainSource Financial Group | 3 Months Ended
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Mar. 31, 2018
Subsequent Events [Abstract] |
Subsequent Event, Pro Forma Business Combinations or Disposals [Text Block] | On April 1, 2018, the Company completed its acquisition of MainSource Financial Group, Inc. and its banking subsidiary, MainSource Bank. Under the terms of the merger agreement, shareholders of MainSource received 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, total purchase consideration was $1.0 billion. The final fair values of assets and liabilities are not yet available. As of March 31, 2018, MainSource had total assets of $4.6 billion, gross loans of $3.0 billion and total deposits of $3.4 billion. The Company anticipates recording goodwill and core deposit intangibles with this acquisition.

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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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