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Regulatory Restrictions and Capital Adequacy - Schedule of Capital Amount and Ratio Considered to be Capitalized (Detail) $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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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 | $ 896,072 | $ 824,670
Tier 1 Common Equity to Risk Weighted Assets | 11.09% | 11.26%
Tier 1 Common Equity Required to be Well Capitalized | $ 525,131 | $ 475,876
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 | $ 906,548 | $ 864,559
Tier 1 Common Equity to Risk Weighted Assets | 11.24% | 11.83%
Tier 1 Common Equity Required to be Well Capitalized | $ 524,081 | $ 475,008
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 | $ 1,160,053 | $ 1,071,965
Tier I Capital to Risk Weighted Assets | 966,072 | 894,670
Tier I Capital to Average Assets | $ 966,072 | $ 894,670
Total Capital to Risk Weighted Assets, Ratio | 0.1436 | 0.1464
Tier I Capital to Risk Weighted Assets, Ratio | 0.1196 | 0.1222
Tier I Capital to Average Assets, Ratio | 0.1018 | 0.0973
Actual | First Commonwealth Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital to Risk Weighted Assets | $ 1,100,529 | $ 1,041,854
Tier I Capital to Risk Weighted Assets | 906,548 | 864,559
Tier I Capital to Average Assets | $ 906,548 | $ 864,559
Total Capital to Risk Weighted Assets, Ratio | 0.1365 | 0.1426
Tier I Capital to Risk Weighted Assets, Ratio | 0.1124 | 0.1183
Tier I Capital to Average Assets, Ratio | 0.0958 | 0.0943
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 | $ 848,288 | $ 768,723
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount | 686,709 | 622,300
Tier I Capital to Average Assets, Regulatory Minimum Capital Amount | 379,527 | 367,656
Tier 1 Common Equity Required for Capital Adequacy | $ 565,525 | $ 512,482
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 | $ 846,593 | $ 767,321
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount | 685,337 | 621,165
Tier I Capital to Average Assets, Regulatory Minimum Capital Amount | 378,578 | 366,839
Tier 1 Common Equity Required for Capital Adequacy | $ 564,395 | $ 511,547
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 | $ 646,314 | $ 585,694
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 | $ 474,408 | $ 459,570
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 | $ 807,893 | $ 732,118
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 | $ 645,023 | $ 584,626
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 | $ 473,223 | $ 458,549
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 | $ 806,279 | $ 730,782
Total Capital to Risk Weighted Assets, Well Capitalized Regulatory Guidelines | 0.1000 | 0.1000

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