First National Bank of Middletown
| Status: | Inactive as of 07/01/1980 |
| Merger - Without Assistance | |
| Successor Bank: | First Financial Bank |
| Headquarters: | First National Bank of Middletown 108 South Main Street Monroe, OH 45050 |
| Established: | 01/01/1865 |
| FDIC Insurance: | 01/01/1934 |
| FDIC Cert: | #762 |
| Charter Class: | Commercial bank, national (federal) charter and Fed member, supervised by the Office of the Comptroller of the Currency (OCC) |
History
| 1865-01-01 | Institution established: Original name:First National Bank of Middletown | |
| 1976-02-23 | Moved bank headquarters from MIDDLETOWN, OH to MONROE, OH | |
| 1980-07-01 | Merged into and subsequently operated as part of First National Bank of Southwestern Ohio (6600) in MONROE, OH | |
| 1980-07-01 | Changed name to First National Bank of Southwestern Ohio (6600) | |
| 1982-12-31 | Acquired First National Bank in Camden (14967) in CAMDEN, OH | |
| 1984-02-01 | Acquired The Peoples Banking Company of Lewisburg (14524) in LEWISBURG, OH | |
| 1991-08-07 | Moved bank headquarters from MONROE, OH to HAMILTON, OH | |
| 2000-07-21 | Acquired Home Federal Bank, a Federal Savings Bank (28308) in HAMILTON, OH | |
| 2002-07-19 | Acquired Hebron Deposit Bank (9305) in HEBRON, KY | |
| 2002-07-19 | Changed name to First Financial Bank, National Association (6600) | |
| 2005-03-18 | Acquired Heritage Community Bank (9088) in COLUMBUS, IN | |
| 2005-08-19 | Acquired Sand Ridge Bank (20086) in HIGHLAND, IN | |
| 2005-08-19 | Acquired Community First Bank & Trust (10660) in CELINA, OH | |
| 2009-07-31 | Acquired Peoples Community Bank (32288) in WEST CHESTER, OH as part of a government assisted transaction. | |
| 2009-09-18 | Acquired Irwin Union Bank and Trust Company (10100) in COLUMBUS, IN as part of a government assisted transaction. | |
| 2009-09-18 | Acquired Irwin Union Bank, F.S.B. (57068) in LOUISVILLE, KY as part of a government assisted transaction. | |
| 2014-08-07 | Acquired The First Bexley Bank (58022) in BEXLEY, OH | |
| 2014-08-07 | Acquired Insight Bank (58215) in WORTHINGTON, OH | |
| 2014-08-21 | Acquired The Guernsey Bank (57413) in WORTHINGTON, OH | |
| 2016-12-30 | Changed institution class to INSURED COMMERCIAL OR SAVINGS BANKS, STATE, MEMBERS FRS | |
| 2016-12-30 | Changed primary regulatory agency from COMPTROLLER OF THE CURRENCY to FEDERAL RESERVE BOARD | |
| 2016-12-30 | Moved bank headquarters from HAMILTON, OH to CINCINNATI, OH | |
| 2016-12-30 | Changed name to First Financial Bank (6600) | |
| 2018-04-01 | Acquired MainSource Bank (5766) in GREENSBURG, IN |