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CAPITAL (Tables)

12 Months Ended

Dec. 31, 2024

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, 2024
Common equity tier 1 capital to risk-weighted assets
Consolidated						$	1,709,422					12.16		%				$	984,145					7.00		%				N/A						N/A
First Financial Bank						1,751,512						12.48		%				982,565						7.00		%				$	912,382					6.50		%
Tier 1 capital to risk-weighted assets
Consolidated						1,754,584						12.48		%				1,195,033						8.50		%				N/A						N/A
First Financial Bank						1,752,054						12.48		%				1,193,114						8.50		%				1,122,931						8.00		%
Total capital to risk-weighted assets
Consolidated						2,057,877						14.64		%				1,476,218						10.50		%				N/A						N/A
First Financial Bank						1,912,456						13.62		%				1,473,847						10.50		%				1,403,664						10.00		%
Leverage
Consolidated						1,754,584						9.98		%				702,969						4.00		%				N/A						N/A
First Financial Bank						1,752,054						9.97		%				702,666						4.00		%				878,333						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, 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						1,907,441						14.26		%				1,404,289						10.50		%				N/A						N/A
First Financial Bank						1,830,677						13.69		%				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		%

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- References

No definition available.

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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/1943274/2147477270/942-505-50-1

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/1943274/2147477270/942-505-50-1B

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