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Regulatory Restrictions and Capital Adequacy - Schedule of Capital Amount and Ratio Considered to be Capitalized (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
First Commonwealth Financial Corporation    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Common Equity to Risk Weighted Assets $ 623,252 $ 563,262
Tier 1 Common Equity to Risk Weighted Assets 10.32% 10.06%
Tier 1 Common Equity Required to be Well Capitalized $ 392,620 $ 364,026
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 $ 658,861 $ 562,784
Tier 1 Common Equity to Risk Weighted Assets 10.94% 10.09%
Tier 1 Common Equity Required to be Well Capitalized $ 391,315 $ 362,680
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 $ 745,473 $ 687,554
Tier I Capital to Risk Weighted Assets 691,993 633,262
Tier I Capital to Average Assets $ 691,993 $ 633,262
Total Capital to Risk Weighted Assets, Ratio 12.34% 12.28%
Tier I Capital to Risk Weighted Assets, Ratio 11.46% 11.31%
Tier I Capital to Average Assets, Ratio 9.74% 9.83%
Actual | First Commonwealth Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk Weighted Assets $ 712,341 $ 617,076
Tier I Capital to Risk Weighted Assets 658,861 562,784
Tier I Capital to Average Assets $ 658,861 $ 562,784
Total Capital to Risk Weighted Assets, Ratio 11.83% 11.06%
Tier I Capital to Risk Weighted Assets, Ratio 10.94% 10.09%
Tier I Capital to Average Assets, Ratio 9.30% 8.79%
Minimum Capital Required - Basel III Phase-In Schedule | First Commonwealth Financial Corporation    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount $ 558,728 $ 483,034
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount 437,922 371,026
Tier I Capital to Average Assets, Regulatory Minimum Capital Amount 284,100 257,776
Tier 1 Common Equity Required for Capital Adequacy $ 347,317 $ 287,020
Total Capital to Risk Weighted Assets, Regulatory Minimum Ratio 9.25% 8.625%
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Ratio 7.25% 6.625%
Tier I Capital to Average Assets, Regulatory Minimum Ratio 4.00% 4.00%
Tier 1 Common Equity Required for Capital Adequacy to Risk Weighted Assets 5.75% 5.125%
Minimum Capital Required - Basel III Phase-In Schedule | First Commonwealth Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount $ 556,872 $ 481,248
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount 436,467 369,654
Tier I Capital to Average Assets, Regulatory Minimum Capital Amount 283,344 256,214
Tier 1 Common Equity Required for Capital Adequacy $ 346,163 $ 285,959
Total Capital to Risk Weighted Assets, Regulatory Minimum Ratio 9.25% 8.625%
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Ratio 7.25% 6.625%
Tier I Capital to Average Assets, Regulatory Minimum Ratio 4.00% 4.00%
Tier 1 Common Equity Required for Capital Adequacy to Risk Weighted Assets 5.75% 5.125%
Minimum Capital Required - Basel III Fully Phased-In | First Commonwealth Financial Corporation    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount $ 634,232 $ 588,042
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount 513,426 476,034
Tier I Capital to Average Assets, Regulatory Minimum Capital Amount 284,100 257,776
Tier 1 Common Equity Required for Capital Adequacy $ 422,821 $ 392,028
Total Capital to Risk Weighted Assets, Regulatory Minimum Ratio 10.50% 10.50%
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Ratio 8.50% 8.50%
Tier I Capital to Average Assets, Regulatory Minimum Ratio 4.00% 4.00%
Tier 1 Common Equity Required for Capital Adequacy to Risk Weighted Assets 7.00% 7.00%
Minimum Capital Required - Basel III Fully Phased-In | First Commonwealth Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount $ 632,124 $ 585,867
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount 511,720 474,273
Tier I Capital to Average Assets, Regulatory Minimum Capital Amount 283,344 256,214
Tier 1 Common Equity Required for Capital Adequacy $ 421,416 $ 390,578
Total Capital to Risk Weighted Assets, Regulatory Minimum Ratio 10.50% 10.50%
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Ratio 8.50% 8.50%
Tier I Capital to Average Assets, Regulatory Minimum Ratio 4.00% 4.00%
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 $ 483,224 $ 448,032
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.00% 8.00%
Tier One Leverage Capital Required to be Well Capitalized $ 355,125 $ 322,220
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00% 5.00%
Total Capital to Risk Weighted Assets, Well Capitalized Regulatory Guidelines $ 604,030 $ 560,040
Total Capital to Risk Weighted Assets, Well Capitalized Regulatory Guidelines 10.00% 10.00%
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 $ 481,619 $ 446,375
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.00% 8.00%
Tier One Leverage Capital Required to be Well Capitalized $ 354,180 $ 320,268
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00% 5.00%
Total Capital to Risk Weighted Assets, Well Capitalized Regulatory Guidelines $ 602,023 $ 557,969
Total Capital to Risk Weighted Assets, Well Capitalized Regulatory Guidelines 10.00% 10.00%