REGULATORY MATTERS: (Tables)

12 Months Ended

Dec. 31, 2019

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 2019 and 2018. 

									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 – 2019	$	495,817	16.16	%	$	322,091	10.500	%	N/A	N/A
Corporation – 2018	$	451,036	19.36	%	$	230,091	9.875	%	N/A	N/A
First Financial Bank – 2019	472,995		15.91	%	312,111		10.500	%	297,249	10.00	%
First Financial Bank – 2018	421,553		18.71	%	222,453		9.875	%	225,268	10.00	%
Common equity tier I capital
Corporation – 2019	$	475,874	15.51	%	$	214,728	7.000	%	N/A	N/A
Corporation – 2018	$	430,600	18.48	%	$	148,540	6.375	%	N/A	N/A
First Financial Bank – 2019	457,649		15.40	%	208,074		7.000	%	193,212	6.50	%
First Financial Bank – 2018	405,181		17.99	%	143,609		6.375	%	146,424	6.50	%
Tier I risk-based capital
Corporation – 2019	$	475,874	15.51	%	$	260,741	8.500	%	N/A	N/A
Corporation – 2018	$	430,600	18.48	%	$	183,490	7.875	%	N/A	N/A
First Financial Bank – 2019	457,649		15.40	%	252,661		8.500	%	237,799	8.00	%
First Financial Bank – 2018	405,181		17.99	%	177,399		7.875	%	180,215	8.00	%
Tier I leverage capital
Corporation – 2019	$	475,874	12.04	%	$	158,081	4.00	%	N/A	N/A
Corporation – 2018	$	430,600	14.59	%	$	118,072	4.00	%	N/A	N/A
First Financial Bank – 2019	457,649		11.93	%	153,453		4.00	%	191,816	5.00	%
First Financial Bank – 2018	405,181		14.19	%	114,213		4.00	%	142,767	5.00	%