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REGULATORY MATTERS (Tables) | 12 Months Ended
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Dec. 31, 2023
REGULATORY MATTERS |
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 2023 and 2022. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 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 – 2023 | ​ | $ | 602,258 |  | 15.80 | % | $ | 400,201 |  | 10.500 | % | N/A |  | N/A | ​
Corporation – 2022 | ​ | ​ | 561,347 |  | 14.61 | % | ​ | 403,400 |  | 10.500 | % | N/A |  | N/A | ​
First Financial Bank – 2023 | ​ |  | 560,975 |  | 14.89 | % |  | 395,567 |  | 10.500 | % | 376,731 |  | 10.00 | %
First Financial Bank – 2022 | ​ |  | 498,246 |  | 13.14 | % |  | 398,179 |  | 10.500 | % | 379,219 |  | 10.00 | %
Common equity tier I capital | ​ |  |  |  |  | ​ |  |  |  |  |  |  |  |  | ​
Corporation – 2023 | ​ | $ | 562,492 |  | 14.76 | % | $ | 266,800 |  | 7.000 | % | N/A |  | N/A | ​
Corporation – 2022 | ​ | ​ | 521,568 |  | 13.58 | % | ​ | 268,933 |  | 7.000 | % | N/A |  | N/A | ​
First Financial Bank – 2023 | ​ |  | 521,209 |  | 13.84 | % |  | 263,712 |  | 7.000 | % | 244,875 |  | 6.50 | %
First Financial Bank – 2022 | ​ |  | 458,467 |  | 12.09 | % |  | 265,453 |  | 7.000 | % | 246,492 |  | 6.50 | %
Tier I risk-based capital | ​ |  |  |  |  | ​ |  | ​ |  |  |  |  |  |  | ​
Corporation – 2023 | ​ | $ | 562,492 |  | 14.76 | % | $ | 323,972 |  | 8.500 | % | N/A |  | N/A | ​
Corporation – 2022 | ​ | ​ | 521,568 |  | 13.58 | % | ​ | 326,562 |  | 8.500 | % | N/A |  | N/A | ​
First Financial Bank – 2023 | ​ |  | 521,209 |  | 13.84 | % |  | 320,221 |  | 8.500 | % | 301,385 |  | 8.00 | %
First Financial Bank – 2022 | ​ |  | 458,467 |  | 12.09 | % |  | 322,336 |  | 8.500 | % | 303,375 |  | 8.00 | %
Tier I leverage capital | ​ |  |  |  |  | ​ |  |  |  |  |  |  |  |  | ​
Corporation – 2023 | ​ | $ | 562,492 |  | 12.14 | % | $ | 185,309 |  | 4.00 | % | N/A |  | N/A | ​
Corporation – 2022 | ​ | ​ | 521,568 |  | 10.78 | % | ​ | 193,476 |  | 4.00 | % | N/A |  | N/A | ​
First Financial Bank – 2023 | ​ |  | 521,209 |  | 10.73 | % |  | 194,384 |  | 4.00 | % | 242,981 |  | 5.00 | %
First Financial Bank – 2022 | ​ |  | 458,467 |  | 9.50 | % |  | 193,073 |  | 4.00 | % | 241,341 |  | 5.00 | %

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B + Details
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