Regulatory Restrictions and Capital Adequacy (Tables)

12 Months Ended

Dec. 31, 2019

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

Schedule of Capital Amount and Ratio Considered to be Capitalized

To be considered well-capitalized, the Company must maintain minimum Total risk-based capital, Tier I risk-based capital, Tier I leverage ratio and Common equity tier I risk-based capital as set forth in the table 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, 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

	Actual				Minimum Capital Required - Basel III Phase-In Schedule				Minimum Capital Required - Basel III Fully Phased-In				Required to be Considered Well Capitalized
	Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio
	(dollars in thousands)
As of December 31, 2018
Total Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	918,786	14.65	%	$	619,173	9.88	%	$	658,361	10.50	%	$	627,011	10.00	%
First Commonwealth Bank	885,151		14.14		618,213		9.88		657,341		10.50		626,039		10.00
Tier I Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	767,881	12.25	%	$	493,771	7.88	%	$	532,959	8.50	%	$	501,608	8.00	%
First Commonwealth Bank	734,246		11.73		493,005		7.88		532,133		8.50		500,831		8.00
Tier I Capital to Average Assets
First Commonwealth Financial Corporation	$	767,881	10.28	%	$	298,856	4.00	%	$	298,856	4.00	%	$	373,570	5.00	%
First Commonwealth Bank	734,246		9.84		298,340		4.00		298,340		4.00		372,926		5.00
Common Equity Tier I to Risk Weighted Assets
First Commonwealth Financial Corporation	$	697,881	11.13	%	$	399,719	6.38	%	$	438,907	7.00	%	$	407,557	6.50	%
First Commonwealth Bank	734,246		11.73		399,100		6.38		438,227		7.00		406,925		6.50