REGULATORY MATTERS: (Tables)

12 Months Ended

Dec. 31, 2021

Financial Services, Banking and Thrift [Abstract]

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 2021 and 2020. 

									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 – 2021	$	533,599	15.63	%	$	358,575	10.500	%	N/A	N/A
Corporation – 2020	$	538,440	17.40	%	$	324,849	10.500	%	N/A	N/A
First Financial Bank – 2021	487,416		14.78	%	346,248		10.500	%	329,760	10.00	%
First Financial Bank – 2020	507,869		17.03	%	313,075		10.500	%	298,166	10.00	%
Common equity tier I capital
Corporation – 2021	$	490,842	14.37	%	$	239,050	7.000	%	N/A	N/A
Corporation – 2020	$	499,664	16.15	%	$	216,566	7.000	%	N/A	N/A
First Financial Bank – 2021	446,189		13.53	%	230,832		7.000	%	214,344	6.50	%
First Financial Bank – 2020	470,551		15.78	%	208,716		7.000	%	193,808	6.50	%
Tier I risk-based capital
Corporation – 2021	$	490,842	14.37	%	$	290,275	8.500	%	N/A	N/A
Corporation – 2020	$	499,664	16.15	%	$	262,973	8.500	%	N/A	N/A
First Financial Bank – 2021	446,189		13.53	%	280,296		8.500	%	263,808	8.00	%
First Financial Bank – 2020	470,551		15.78	%	253,441		8.500	%	238,533	8.00	%
Tier I leverage capital
Corporation – 2021	$	490,842	9.83	%	$	199,702	4.00	%	N/A	N/A
Corporation – 2020	$	499,664	11.24	%	$	177,781	4.00	%	N/A	N/A
First Financial Bank – 2021	446,189		9.18	%	194,405		4.00	%	243,006	5.00	%
First Financial Bank – 2020	470,551		10.90	%	172,728		4.00	%	215,910	5.00	%