Regulatory Restrictions and Capital Adequacy (Tables)

12 Months Ended

Dec. 31, 2018

Regulatory Capital Requirements [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 - 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

	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, 2017
Total Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	745,473	12.34	%	$	558,728	9.25	%	$	634,232	10.50	%	$	604,030	10.00	%
First Commonwealth Bank	712,341		11.83		556,872		9.25		632,124		10.50		602,023		10.00
Tier I Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	691,993	11.46	%	$	437,922	7.25	%	$	513,426	8.50	%	$	483,224	8.00	%
First Commonwealth Bank	658,861		10.94		436,467		7.25		511,720		8.50		481,619		8.00
Tier I Capital to Average Assets
First Commonwealth Financial Corporation	$	691,993	9.74	%	$	284,100	4.00	%	$	284,100	4.00	%	$	355,125	5.00	%
First Commonwealth Bank	658,861		9.30		283,344		4.00		283,344		4.00		354,180		5.00
Common Equity Tier I to Risk Weighted Assets
First Commonwealth Financial Corporation	$	623,252	10.32	%	$	347,317	5.75	%	$	422,821	7.00	%	$	392,620	6.50	%
First Commonwealth Bank	658,861		10.94		346,163		5.75		421,416		7.00		391,315		6.50