Regulatory Restrictions and Capital Adequacy (Tables)

12 Months Ended

Dec. 31, 2020

Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]

Schedule of Capital Amount and Ratio Considered to be Capitalized

as set forth in the tables below:

	Actual				Minimum Capital Required				Required to be Considered Well Capitalized
	Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio
	(dollars in thousands)
As of December 31, 2020
Total Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	1,010,608	14.88	%	$	713,289	10.50	%	$	679,323	10.00	%
First Commonwealth Bank	974,911		14.36		712,995		10.50		679,043		10.00
Tier I Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	827,231	12.18	%	$	577,424	8.50	%	$	543,458	8.00	%
First Commonwealth Bank	791,568		11.66		577,186		8.50		543,234		8.00
Tier I Capital to Average Assets
First Commonwealth Financial Corporation	$	827,231	9.40	%	$	352,023	4.00	%	$	440,029	5.00	%
First Commonwealth Bank	791,568		9.01		351,244		4.00		439,055		5.00
Common Equity Tier I to Risk Weighted Assets
First Commonwealth Financial Corporation	$	757,231	11.15	%	$	475,526	7.00	%	$	441,560	6.50	%
First Commonwealth Bank	791,568		11.66		475,330		7.00		441,378		6.50

	Actual				Minimum Capital Required				Required to be Considered Well Capitalized
	Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio
	(dollars in thousands)
As of December 31, 2019
Total Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	954,991	14.26	%	$	703,370	10.50	%	$	669,877	10.00	%
First Commonwealth Bank	913,863		13.67		702,006		10.50		668,577		10.00
Tier I Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	800,526	11.95	%	$	569,395	8.50	%	$	535,901	8.00	%
First Commonwealth Bank	759,398		11.36		568,291		8.50		534,862		8.00
Tier I Capital to Average Assets
First Commonwealth Financial Corporation	$	800,526	10.17	%	$	314,963	4.00	%	$	393,704	5.00	%
First Commonwealth Bank	759,398		9.66		314,338		4.00		392,922		5.00
Common Equity Tier I to Risk Weighted Assets
First Commonwealth Financial Corporation	$	730,526	10.91	%	$	468,914	7.00	%	$	435,420	6.50	%
First Commonwealth Bank	759,398		11.36		468,004		7.00		434,575		6.50