Regulatory Restrictions and Capital Adequacy (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016
Total Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	687,554	12.28	%	$	483,034	8.63	%	$	588,042	10.50	%	$	560,040	10.00	%
First Commonwealth Bank	617,076		11.06		481,248		8.63		585,867		10.50		557,969		10.00
Tier I Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	633,262	11.31	%	$	371,026	6.63	%	$	476,034	8.50	%	$	448,032	8.00	%
First Commonwealth Bank	562,784		10.09		369,654		6.63		474,273		8.50		446,375		8.00
Tier I Capital to Average Assets
First Commonwealth Financial Corporation	$	633,262	9.83	%	$	257,776	4.00	%	$	257,776	4.00	%	$	322,220	5.00	%
First Commonwealth Bank	562,784		8.79		256,214		4.00		256,214		4.00		320,268		5.00
Common Equity Tier I to Risk Weighted Assets
First Commonwealth Financial Corporation	$	563,262	10.06	%	$	287,020	5.13	%	$	392,028	7.00	%	$	364,026	6.50	%
First Commonwealth Bank	562,784		10.09		285,959		5.13		390,578		7.00		362,680		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, 2015
Total Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	682,199	12.25	%	$	445,650	8.00	%	$	584,915	10.50	%	$	557,062	10.00	%
First Commonwealth Bank	656,244		11.78		445,642		8.00		584,905		10.50		557,052		10.00
Tier I Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	626,939	11.25	%	$	334,237	6.00	%	$	473,503	8.50	%	$	445,650	8.00	%
First Commonwealth Bank	600,984		10.79		334,231		6.00		473,494		8.50		445,642		8.00
Tier I Capital to Average Assets
First Commonwealth Financial Corporation	$	626,939	9.85	%	$	254,631	4.00	%	$	254,631	4.00	%	$	318,289	5.00	%
First Commonwealth Bank	600,984		9.46		254,095		4.00		254,095		4.00		317,618		5.00
Common Equity Tier I to Risk Weighted Assets
First Commonwealth Financial Corporation	$	556,939	10.00	%	$	250,678	4.50	%	$	389,944	7.00	%	$	362,091	6.50	%
First Commonwealth Bank	535,814		9.62		250,673		4.50		389,937		7.00		362,084		6.50