Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2024

Deposits [Abstract]

Schedule of Regulatory Capital Ratios Under the Basel III Regulatory Capital Framework

As of December 31, 2024 and 2023, the regulatory capital ratios of the Company and Bank under the Basel III regulatory capital framework are as follows:

	Actual					Minimum Capital Required-Basel III Fully Phased-In*					Required to be Considered Well- Capitalized
As of December 31, 2024:	Amount		Ratio			Amount		Ratio			Amount		Ratio
Total Capital to Risk-Weighted Assets:
Consolidated	$	1,838,118		20.00	%	$	965,103		10.50	%	$	919,146		10.00	%
First Financial Bank	$	1,698,590		18.53	%	$	962,524		10.50	%	$	916,689		10.00	%
Tier 1 Capital to Risk-Weighted Assets:
Consolidated	$	1,731,116		18.83	%	$	781,274		8.50	%	$	551,487		6.00	%
First Financial Bank	$	1,591,588		17.36	%	$	779,186		8.50	%	$	733,351		8.00	%
Common Equity Tier 1 Capital to Risk-Weighted Assets:
Consolidated	$	1,731,116		18.83	%	$	643,402		7.00	%		—	N/A
First Financial Bank	$	1,591,588		17.36	%	$	641,682		7.00	%	$	595,848		6.50	%
Leverage Ratio:
Consolidated	$	1,731,116		12.49	%	$	367,658		4.00	%		—	N/A
First Financial Bank	$	1,591,588		11.53	%	$	366,676		4.00	%	$	458,345		5.00	%

	Actual					Minimum Capital Required-Basel III Fully Phased-In*					Required to be Considered Well- Capitalized
As of December 31, 2023:	Amount		Ratio			Amount		Ratio			Amount		Ratio
Total Capital to Risk-Weighted Assets:
Consolidated	$	1,697,999		19.62	%	$	908,870		10.50	%	$	865,590		10.00	%
First Financial Bank	$	1,518,365		17.59	%	$	906,541		10.50	%	$	863,372		10.00	%
Tier 1 Capital to Risk-Weighted Assets:
Consolidated	$	1,601,361		18.50	%	$	735,752		8.50	%	$	519,354		6.00	%
First Financial Bank	$	1,421,727		16.47	%	$	733,866		8.50	%	$	690,698		8.00	%
Common Equity Tier 1 Capital to Risk-Weighted Assets:
Consolidated	$	1,601,361		18.50	%	$	605,913		7.00	%		—	N/A
First Financial Bank	$	1,421,727		16.47	%	$	604,361		7.00	%	$	561,192		6.50	%
Leverage Ratio:
Consolidated	$	1,601,361		12.06	%	$	346,236		4.00	%		—	N/A
First Financial Bank	$	1,421,727		10.75	%	$	345,349		4.00	%	$	431,686		5.00	%