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Regulatory Restrictions and Capital Adequacy - Schedule of Capital Amount and Ratio Considered to be Capitalized (Detail) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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First Commonwealth Financial Corporation |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 Common Equity to Risk Weighted Assets | $ 1,052,814 | $ 896,072
Tier 1 Common Equity to Risk Weighted Assets | 11.16% | 11.09%
Tier 1 Common Equity Required to be Well Capitalized | $ 613,172 | $ 525,131
Tier 1 Common Equity Required to be Well Capitalized to Risk Weighted Assets | 6.50% | 6.50%
First Commonwealth Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 Common Equity to Risk Weighted Assets | $ 1,030,975 | $ 906,548
Tier 1 Common Equity to Risk Weighted Assets | 10.97% | 11.24%
Tier 1 Common Equity Required to be Well Capitalized | $ 610,727 | $ 524,081
Tier 1 Common Equity Required to be Well Capitalized to Risk Weighted Assets | 6.50% | 6.50%
Actual | First Commonwealth Financial Corporation |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital to Risk Weighted Assets | $ 1,314,021 | $ 1,160,053
Tier I Capital to Risk Weighted Assets | 1,122,814 | 966,072
Tier I Capital to Average Assets | $ 1,122,814 | $ 966,072
Total Capital to Risk Weighted Assets, Ratio | 0.1393 | 0.1436
Tier I Capital to Risk Weighted Assets, Ratio | 0.1190 | 0.1196
Tier I Capital to Average Assets, Ratio | 0.1004 | 0.1018
Actual | First Commonwealth Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital to Risk Weighted Assets | $ 1,222,182 | $ 1,100,529
Tier I Capital to Risk Weighted Assets | 1,030,975 | 906,548
Tier I Capital to Average Assets | $ 1,030,975 | $ 906,548
Total Capital to Risk Weighted Assets, Ratio | 0.1301 | 0.1365
Tier I Capital to Risk Weighted Assets, Ratio | 0.1097 | 0.1124
Tier I Capital to Average Assets, Ratio | 0.0924 | 0.0958
Minimum Capital Required | First Commonwealth Financial Corporation |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount | $ 990,508 | $ 848,288
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount | 801,840 | 686,709
Tier I Capital to Average Assets, Regulatory Minimum Capital Amount | 447,542 | 379,527
Tier 1 Common Equity Required for Capital Adequacy | $ 660,339 | $ 565,525
Total Capital to Risk Weighted Assets, Regulatory Minimum Ratio | 0.1050 | 0.1050
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Ratio | 0.0850 | 0.0850
Tier I Capital to Average Assets, Regulatory Minimum Ratio | 0.0400 | 0.0400
Tier 1 Common Equity Required for Capital Adequacy to Risk Weighted Assets | 7.00% | 7.00%
Minimum Capital Required | First Commonwealth Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount | $ 986,558 | $ 846,593
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount | 798,642 | 685,337
Tier I Capital to Average Assets, Regulatory Minimum Capital Amount | 446,530 | 378,578
Tier 1 Common Equity Required for Capital Adequacy | $ 657,705 | $ 564,395
Total Capital to Risk Weighted Assets, Regulatory Minimum Ratio | 0.1050 | 0.1050
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Ratio | 0.0850 | 0.0850
Tier I Capital to Average Assets, Regulatory Minimum Ratio | 0.0400 | 0.0400
Tier 1 Common Equity Required for Capital Adequacy to Risk Weighted Assets | 7.00% | 7.00%
Required to be Considered Well Capitalized | First Commonwealth Financial Corporation |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier One Risk Based Capital Required to be Well Capitalized | $ 754,673 | $ 646,314
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 0.0800 | 0.0800
Tier One Leverage Capital Required to be Well Capitalized | $ 559,427 | $ 474,408
Tier One Leverage Capital Required to be Well Capitalized to Average Assets | 0.0500 | 0.0500
Total Capital to Risk Weighted Assets, Well Capitalized Regulatory Guidelines | $ 943,341 | $ 807,893
Total Capital to Risk Weighted Assets, Well Capitalized Regulatory Guidelines | 0.1000 | 0.1000
Required to be Considered Well Capitalized | First Commonwealth Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier One Risk Based Capital Required to be Well Capitalized | $ 751,663 | $ 645,023
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 0.0800 | 0.0800
Tier One Leverage Capital Required to be Well Capitalized | $ 558,163 | $ 473,223
Tier One Leverage Capital Required to be Well Capitalized to Average Assets | 0.0500 | 0.0500
Total Capital to Risk Weighted Assets, Well Capitalized Regulatory Guidelines | $ 939,579 | $ 806,279
Total Capital to Risk Weighted Assets, Well Capitalized Regulatory Guidelines | 0.1000 | 0.1000

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