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CAPITAL (Tables) | 12 Months Ended
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Dec. 31, 2023
Banking Regulation, Total Capital [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | Actual |  | Minimum capital required - Basel III |  | PCA requirement to be considered well capitalized |  |
(Dollars in thousands) |  | Capital amount |  | Ratio |  | Capital amount |  | Ratio |  | Capital amount |  | Ratio |  |  |  |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity tier 1 capital to risk-weighted assets |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 1,568,815 |  |  | 11.73 | % |  | $ | 936,192 |  |  | 7.00 | % |  | N/A |  | N/A |  |  |  |
First Financial Bank |  | 1,701,338 |  |  | 12.73 | % |  | 935,746 |  |  | 7.00 | % |  | $ | 868,907 |  |  | 6.50 | % |  |  |  |
Tier 1 capital to risk-weighted assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 1,613,480 |  |  | 12.06 | % |  | 1,136,805 |  |  | 8.50 | % |  | N/A |  | N/A |  |  |  |
First Financial Bank |  | 1,701,840 |  |  | 12.73 | % |  | 1,136,263 |  |  | 8.50 | % |  | 1,069,424 |  |  | 8.00 | % |  |  |  |
Total capital to risk-weighted assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 1,820,285 |  |  | 13.61 | % |  | 1,404,289 |  |  | 10.50 | % |  | N/A |  | N/A |  |  |  |
First Financial Bank |  | 1,743,521 |  |  | 13.04 | % |  | 1,403,619 |  |  | 10.50 | % |  | 1,336,780 |  |  | 10.00 | % |  |  |  |
Leverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 1,613,480 |  |  | 9.70 | % |  | 665,125 |  |  | 4.00 | % |  | N/A |  | N/A |  |  |  |
First Financial Bank |  | 1,701,840 |  |  | 10.24 | % |  | 664,781 |  |  | 4.00 | % |  | 830,976 |  |  | 5.00 | % |  |  |  |
|  | Actual |  | Minimum capital required - Basel III |  | PCA requirement to be considered well capitalized
(Dollars in thousands) |  | Capital amount |  | Ratio |  | Capital amount |  | Ratio |  | Capital amount |  | Ratio
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Common equity tier 1 capital to risk-weighted assets |  |  |  |  |  |  |  |
Consolidated |  | $ | 1,399,420 |  |  | 10.83 | % |  | $ | 904,626 |  |  | 7.00 | % |  | N/A |  | N/A
First Financial Bank |  | 1,581,328 |  |  | 12.26 | % |  | 903,244 |  |  | 7.00 | % |  | $ | 838,726 |  |  | 6.50 | %
Tier 1 capital to risk-weighted assets |  |  |  |  |  |  |  |  |  |
Consolidated |  | 1,443,698 |  |  | 11.17 | % |  | 1,098,475 |  |  | 8.50 | % |  | N/A |  | N/A
First Financial Bank |  | 1,581,900 |  |  | 12.26 | % |  | 1,096,796 |  |  | 8.50 | % |  | 1,032,278 |  |  | 8.00 | %
Total capital to risk-weighted assets |  |  |  |  |  |  |  |  |  |
Consolidated |  | 1,691,255 |  |  | 13.09 | % |  | 1,356,939 |  |  | 10.50 | % |  | N/A |  | N/A
First Financial Bank |  | 1,640,671 |  |  | 12.71 | % |  | 1,354,865 |  |  | 10.50 | % |  | 1,290,348 |  |  | 10.00 | %
Leverage |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 1,443,698 |  |  | 8.89 | % |  | 649,636 |  |  | 4.00 | % |  | N/A |  | N/A
First Financial Bank |  | 1,581,900 |  |  | 9.76 | % |  | 648,607 |  |  | 4.00 | % |  | 810,759 |  |  | 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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