REGULATORY MATTERS: (Tables)

12 Months Ended

Dec. 31, 2020

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 2020 and 2019. 

									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 – 2020	$	538,440	17.40	%	$	324,849	10.500	%	N/A	N/A
Corporation – 2019	$	495,817	16.16	%	$	322,091	10.500	%	N/A	N/A
First Financial Bank – 2020	507,869		17.03	%	313,075		10.500	%	298,166	10.00	%
First Financial Bank – 2019	472,995		15.91	%	312,111		10.500	%	297,249	10.00	%
Common equity tier I capital
Corporation – 2020	$	499,664	16.15	%	$	216,566	7.000	%	N/A	N/A
Corporation – 2019	$	475,874	15.51	%	$	214,728	7.000	%	N/A	N/A
First Financial Bank – 2020	470,551		15.78	%	208,716		7.000	%	193,808	6.50	%
First Financial Bank – 2019	457,649		15.40	%	208,074		7.000	%	193,212	6.50	%
Tier I risk-based capital
Corporation – 2020	$	499,664	16.15	%	$	262,973	8.500	%	N/A	N/A
Corporation – 2019	$	475,874	15.51	%	$	260,741	8.500	%	N/A	N/A
First Financial Bank – 2020	470,551		15.78	%	253,441		8.500	%	238,533	8.00	%
First Financial Bank – 2019	457,649		15.40	%	252,661		8.500	%	237,799	8.00	%
Tier I leverage capital
Corporation – 2020	$	499,664	11.24	%	$	177,781	4.00	%	N/A	N/A
Corporation – 2019	$	475,874	12.04	%	$	158,081	4.00	%	N/A	N/A
First Financial Bank – 2020	470,551		10.90	%	172,728		4.00	%	215,910	5.00	%
First Financial Bank – 2019	457,649		11.93	%	153,453		4.00	%	191,816	5.00	%