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Regulatory Restrictions and Capital Adequacy - Schedule of Capital Amount and Ratio Considered to be Capitalized (Detail) $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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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 | $ 824,670 | $ 757,231
Tier 1 Common Equity to Risk Weighted Assets | 11.26% | 11.15%
Tier 1 Common Equity Required to be Well Capitalized | $ 475,876 | $ 441,560
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 | $ 864,559 | $ 791,568
Tier 1 Common Equity to Risk Weighted Assets | 11.83% | 11.66%
Tier 1 Common Equity Required to be Well Capitalized | $ 475,008 | $ 441,378
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 | $ 1,071,965 | $ 1,010,608
Tier I Capital to Risk Weighted Assets | 894,670 | 827,231
Tier I Capital to Average Assets | $ 894,670 | $ 827,231
Total Capital to Risk Weighted Assets, Ratio | 0.1464 | 0.1488
Tier I Capital to Risk Weighted Assets, Ratio | 0.1222 | 0.1218
Tier I Capital to Average Assets, Ratio | 0.0973 | 0.0940
Actual | First Commonwealth Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital to Risk Weighted Assets | $ 1,041,854 | $ 974,911
Tier I Capital to Risk Weighted Assets | 864,559 | 791,568
Tier I Capital to Average Assets | $ 864,559 | $ 791,568
Total Capital to Risk Weighted Assets, Ratio | 0.1426 | 0.1436
Tier I Capital to Risk Weighted Assets, Ratio | 0.1183 | 0.1166
Tier I Capital to Average Assets, Ratio | 0.0943 | 0.0901
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 | $ 768,723 | $ 713,289
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount | 622,300 | 577,424
Tier I Capital to Average Assets, Regulatory Minimum Capital Amount | 367,656 | 352,023
Tier 1 Common Equity Required for Capital Adequacy | $ 512,482 | $ 475,526
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 | $ 767,321 | $ 712,995
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount | 621,165 | 577,186
Tier I Capital to Average Assets, Regulatory Minimum Capital Amount | 366,839 | 351,244
Tier 1 Common Equity Required for Capital Adequacy | $ 511,547 | $ 475,330
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 | $ 585,694 | $ 543,458
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 | $ 459,570 | $ 440,029
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 | $ 732,118 | $ 679,323
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 | $ 584,626 | $ 543,234
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 | $ 458,549 | $ 439,055
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 | $ 730,782 | $ 679,043
Total Capital to Risk Weighted Assets, Well Capitalized Regulatory Guidelines | 0.1000 | 0.1000

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