    <SEC-DOCUMENT>0001626129-17-000564-index.html : 20171017
    <SEC-HEADER>0001626129-17-000564.hdr.sgml : 20171017
    <ACCEPTANCE-DATETIME>20171017171741
    ACCESSION NUMBER:		0001626129-17-000564
    CONFORMED SUBMISSION TYPE:	S-4/A
    PUBLIC DOCUMENT COUNT:		15
    FILED AS OF DATE:		20171017
    DATE AS OF CHANGE:		20171017

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			FIRST FINANCIAL BANCORP /OH/
    		CENTRAL INDEX KEY:			0000708955
    		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
    		IRS NUMBER:				311042001
    		STATE OF INCORPORATION:			OH
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		S-4/A
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-220583
    		FILM NUMBER:		171141266

    	BUSINESS ADDRESS:
    		STREET 1:		255 EAST FIFTH STREET
    		STREET 2:		SUITE 800
    		CITY:			CINCINNATI
    		STATE:			OH
    		ZIP:			45202
    		BUSINESS PHONE:		8773229530

    	MAIL ADDRESS:
    		STREET 1:		255 EAST FIFTH STREET
    		STREET 2:		SUITE 800
    		CITY:			CINCINNATI
    		STATE:			OH
    		ZIP:			45202
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>S-4/A
    <SEQUENCE>1
    <FILENAME>bs62710x2_s4a.htm
    <DESCRIPTION>FORM S-4/A
    <TEXT>
    Document 1 - file: bs62710x2_s4a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-8.1
    <SEQUENCE>2
    <FILENAME>bs62710x2_ex8-1.htm
    <DESCRIPTION>EXHIBIT 8.1
    <TEXT>
    Document 2 - file: bs62710x2_ex8-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-8.2
    <SEQUENCE>3
    <FILENAME>bs62710x2_ex8-2.htm
    <DESCRIPTION>EXHIBIT 8.2
    <TEXT>
    Document 3 - file: bs62710x2_ex8-2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.3
    <SEQUENCE>4
    <FILENAME>bs62710x2_ex99-3.htm
    <DESCRIPTION>EXHIBIT 99.3
    <TEXT>
    Document 4 - file: bs62710x2_ex99-3.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.4
    <SEQUENCE>5
    <FILENAME>bs62710x2_ex99-4.htm
    <DESCRIPTION>EXHIBIT 99.4
    <TEXT>
    Document 5 - file: bs62710x2_ex99-4.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>bs62710x2ex8_1-header.jpg
    <TEXT>
    Document 6 - file: bs62710x2ex8_1-header.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>bs62710x2ex99_3-image02.jpg
    <TEXT>
    Document 7 - file: bs62710x2ex99_3-image02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>bs62710x2ex99_4-proxycard1.jpg
    <TEXT>
    Document 8 - file: bs62710x2ex99_4-proxycard1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>bs62710x2ex99_4-proxycard2.jpg
    <TEXT>
    Document 9 - file: bs62710x2ex99_4-proxycard2.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>bs62710x2_ex8-2image2.jpg
    <TEXT>
    Document 10 - file: bs62710x2_ex8-2image2.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>image00002.jpg
    <TEXT>
    Document 11 - file: image00002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>logo_firstfinancial.jpg
    <TEXT>
    Document 12 - file: logo_firstfinancial.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>logo_mainsource.jpg
    <TEXT>
    Document 13 - file: logo_mainsource.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>sig_abrown.jpg
    <TEXT>
    Document 14 - file: sig_abrown.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>sig_cdavis.jpg
    <TEXT>
    Document 15 - file: sig_cdavis.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>