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REGULATORY MATTERS: (Tables) | 12 Months Ended
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Dec. 31, 2018
Banking and Thrift [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The following table presents the actual and required capital amounts and related ratios for the Corporation and First Financial Bank, N.A., at year-end 2018 and 2017.
|  |  |  |  |  |  |  |  |  | To Be Well Capitalized
|  |  |  |  |  | For Capital |  | Under Prompt Corrective
|  | Actual |  | Adequacy Purposes |  | Action Provisions
(Dollar amounts in thousands) |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
Total risk-based capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporation – 2018 |  | $ | 451,036 |  |  | 19.36 | % |  | $ | 230,091 |  |  | 9.875 | % |  | N/A |  |  | N/A |
Corporation – 2017 |  | $ | 412,525 |  |  | 17.88 | % |  | $ | 213,446 |  |  | 9.250 | % |  | N/A |  |  | N/A |
First Financial Bank – 2018 |  | 421,553 |  |  | 18.71 | % |  | 222,453 |  |  | 9.875 | % |  | 225,268 |  |  | 10.00 | %
First Financial Bank – 2017 |  | 386,593 |  |  | 17.30 | % |  | 206,745 |  |  | 9.250 | % |  | 223,508 |  |  | 10.00 | %
Common equity tier I capital |  |  |  |  |  |  |  |  |  |  |  |
Corporation – 2018 |  | $ | 430,600 |  |  | 18.48 | % |  | $ | 148,540 |  |  | 6.375 | % |  | N/A |  |  | N/A |
Corporation – 2017 |  | $ | 392,615 |  |  | 17.01 | % |  | $ | 132,682 |  |  | 5.750 | % |  | N/A |  |  | N/A |
First Financial Bank – 2018 |  | 405,181 |  |  | 17.99 | % |  | 143,609 |  |  | 6.375 | % |  | 146,424 |  |  | 6.50 | %
First Financial Bank – 2017 |  | 370,061 |  |  | 16.56 | % |  | 128,517 |  |  | 5.750 | % |  | 145,280 |  |  | 6.50 | %
Tier I risk-based capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporation – 2018 |  | $ | 430,600 |  |  | 18.48 | % |  | $ | 183,490 |  |  | 7.875 | % |  | N/A |  |  | N/A |
Corporation – 2017 |  | $ | 392,615 |  |  | 17.01 | % |  | $ | 167,295 |  |  | 7.250 | % |  | N/A |  |  | N/A |
First Financial Bank – 2018 |  | 405,181 |  |  | 17.99 | % |  | 177,399 |  |  | 7.875 | % |  | 180,215 |  |  | 8.00 | %
First Financial Bank – 2017 |  | 370,061 |  |  | 16.56 | % |  | 162,044 |  |  | 7.250 | % |  | 178,807 |  |  | 8.00 | %
Tier I leverage capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporation – 2018 |  | $ | 430,600 |  |  | 14.59 | % |  | $ | 118,072 |  |  | 4.00 | % |  | N/A |  |  | N/A |
Corporation – 2017 |  | $ | 392,615 |  |  | 13.31 | % |  | $ | 117,956 |  |  | 4.00 | % |  | N/A |  |  | N/A |
First Financial Bank – 2018 |  | 405,181 |  |  | 14.19 | % |  | 114,213 |  |  | 4.00 | % |  | 142,767 |  |  | 5.00 | %
First Financial Bank – 2017 |  | 370,061 |  |  | 12.81 | % |  | 115,553 |  |  | 4.00 | % |  | 144,441 |  |  | 5.00 | %

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