Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2022

Deposits [Abstract]

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

As of December 31, 2022 and 2021, 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, 2022:	Amount		Ratio			Amount		Ratio			Amount		Ratio
Total Capital to Risk-Weighted Assets:
Consolidated	$	1,586,888		19.29	%	$	863,622		10.50	%	$	822,497		10.00	%
First Financial Bank, N.A	$	1,442,902		17.58	%	$	861,860		10.50	%	$	820,819		10.00	%
Tier 1 Capital to Risk-Weighted Assets:
Consolidated	$	1,498,731		18.22	%	$	699,122		8.50	%	$	493,498		6.00	%
First Financial Bank, N.A	$	1,354,745		16.50	%	$	697,696		8.50	%	$	656,655		8.00	%
Common Equity Tier 1 Capital to Risk-Weighted Assets:
Consolidated	$	1,498,731		18.22	%	$	575,748		7.00	%		—	N/A
First Financial Bank, N.A	$	1,354,745		16.50	%	$	574,573		7.00	%	$	533,532		6.50	%
Leverage Ratio:
Consolidated	$	1,498,731		10.96	%	$	546,983		4.00	%		—	N/A
First Financial Bank, N.A	$	1,354,745		9.95	%	$	544,886		4.00	%	$	681,107		5.00	%

	Actual					Minimum Capital Required-Basel III Fully Phased-In*					Required to be Considered Well- Capitalized
As of December 31, 2021:	Amount		Ratio			Amount		Ratio			Amount		Ratio
Total Capital to Risk-Weighted Assets:
Consolidated	$	1,425,907		20.34	%	$	736,003		10.50	%	$	700,955		10.00	%
First Financial Bank, N.A	$	1,258,965		17.99	%	$	734,604		10.50	%	$	699,623		10.00	%
Tier 1 Capital to Risk-Weighted Assets:
Consolidated	$	1,356,006		19.35	%	$	595,812		8.50	%	$	420,573		6.00	%
First Financial Bank, N.A	$	1,189,064		17.00	%	$	594,679		8.50	%	$	559,698		8.00	%
Common Equity Tier 1 Capital to Risk-Weighted Assets:
Consolidated	$	1,356,006		19.35	%	$	490,669		7.00	%		—	N/A
First Financial Bank, N.A	$	1,189,064		17.00	%	$	489,736		7.00	%	$	454,755		6.50	%
Leverage Ratio:
Consolidated	$	1,356,006		11.13	%	$	487,459		4.00	%		—	N/A
First Financial Bank, N.A	$	1,189,064		9.79	%	$	485,926		4.00	%	$	607,407		5.00	%