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Regulatory Restrictions and Capital Adequacy - Schedule of Capital Amount and Ratio Considered to be Capitalized (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Well Capitalized Regulatory Guidelines [Member] | First Commonwealth Bank [Member]
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
First Commonwealth Bank $ 486,776 $ 487,715
First Commonwealth Bank 292,066 292,629
First Commonwealth Bank 285,680 274,534
Total Capital to Risk Weighted Assets 10.00% 10.00%
Teir I Capital to Risk Weighted Assets 6.00% 6.00%
Tier I Capital to Average Assets 5.00% 5.00%
Regulatory Minimum [Member] | First Commonwealth Bank [Member]
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk Weighted Assets 389,421 390,172
Teir I Capital to Risk Weighted Assets 194,710 195,086
Tier I Capital to Average Assets 228,544 219,627
Total Capital to Risk Weighted Assets 8.00% 8.00%
First Commonwealth Bank 4.00% 4.00%
First Commonwealth Bank 4.00% 4.00%
Regulatory Minimum [Member] | First Commonwealth Financial Corporation [Member]
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk Weighted Assets 390,173 391,709
Teir I Capital to Risk Weighted Assets 195,087 195,855
Tier I Capital to Average Assets 230,322 221,444
Total Capital to Risk Weighted Assets 8.00% 8.00%
First Commonwealth Bank 4.00% 4.00%
First Commonwealth Bank 4.00% 4.00%
Actual [Member] | First Commonwealth Bank [Member]
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk Weighted Assets 669,131 689,333
Teir I Capital to Risk Weighted Assets 608,176 628,346
Tier I Capital to Average Assets 608,176 628,346
Total Capital to Risk Weighted Assets 13.75% 14.13%
Teir I Capital to Risk Weighted Assets 12.49% 12.88%
Tier I Capital to Average Assets 10.64% 11.44%
Actual [Member] | First Commonwealth Financial Corporation [Member]
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk Weighted Assets 708,583 720,307
Teir I Capital to Risk Weighted Assets 647,460 659,083
Tier I Capital to Average Assets $ 647,460 $ 659,083
Total Capital to Risk Weighted Assets 14.53% 14.71%
Teir I Capital to Risk Weighted Assets 13.28% 13.46%
Tier I Capital to Average Assets 11.24% 11.91%