Regulatory Restrictions and Capital Adequacy (Tables)

12 Months Ended

Dec. 31, 2025

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

Schedule of Capital Amount and Ratio Considered to be Capitalized

n 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, 2025
Total Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	1,471,506	14.47	%	$	1,067,542	10.50	%	$	1,016,707	10.00	%
First Commonwealth Bank	1,362,592		13.43		1,065,303		10.50		1,014,574		10.00
Tier I Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	1,294,913	12.74	%	$	864,201	8.50	%	$	813,365	8.00	%
First Commonwealth Bank	1,186,263		11.69		862,388		8.50		811,659		8.00
Tier I Capital to Average Assets
First Commonwealth Financial Corporation	$	1,294,913	10.86	%	$	476,821	4.00	%	$	596,026	5.00	%
First Commonwealth Bank	1,186,263		9.97		475,776		4.00		594,720		5.00
Common Equity Tier I to Risk Weighted Assets
First Commonwealth Financial Corporation	$	1,224,913	12.05	%	$	711,695	7.00	%	$	660,859	6.50	%
First Commonwealth Bank	1,186,263		11.69		710,202		7.00		659,473		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, 2024
Total Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	1,366,963	14.58	%	$	984,292	10.50	%	$	937,421	10.00	%
First Commonwealth Bank	1,268,403		13.56		982,216		10.50		935,444		10.00
Tier I Capital to Risk Weighted Assets
First Commonwealth Financial Corporation	$	1,207,183	12.88	%	$	796,808	8.50	%	$	749,937	8.00	%
First Commonwealth Bank	1,108,623		11.85		795,128		8.50		748,355		8.00
Tier I Capital to Average Assets
First Commonwealth Financial Corporation	$	1,207,183	10.63	%	$	454,457	4.00	%	$	568,071	5.00	%
First Commonwealth Bank	1,108,623		9.78		453,467		4.00		566,834		5.00
Common Equity Tier I to Risk Weighted Assets
First Commonwealth Financial Corporation	$	1,137,183	12.13	%	$	656,195	7.00	%	$	609,324	6.50	%
First Commonwealth Bank	1,108,623		11.85		654,811		7.00		608,039		6.50