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Regulatory Restrictions and Capital Adequacy (Tables) | 12 Months Ended
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Dec. 31, 2017
Regulatory Capital Requirements [Abstract] |
Schedule of Capital Amount and Ratio Considered to be Capitalized | To be considered well-capitalized, the Company must maintain minimum Total risk-based capital, Tier I risk-based capital, Tier I leverage ratio and Common equity tier I risk-based capital as set forth in the table below:
| Actual |  | Minimum Capital Required - Basel III Phase-In Schedule |  | Minimum Capital Required - Basel III Fully Phased-In |  | Required to be Considered Well Capitalized
| Capital Amount |  | Ratio |  | Capital Amount |  | Ratio |  | Capital Amount |  | Ratio |  | Capital Amount |  | Ratio
| (dollars in thousands)
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital to Risk Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Commonwealth Financial Corporation | $ | 745,473 |  |  | 12.34 | % |  | $ | 558,728 |  |  | 9.25 | % |  | $ | 634,232 |  |  | 10.50 | % |  | $ | 604,030 |  |  | 10.00 | %
First Commonwealth Bank | 712,341 |  |  | 11.83 |  |  | 556,872 |  |  | 9.25 |  |  | 632,124 |  |  | 10.50 |  |  | 602,023 |  |  | 10.00 |
Tier I Capital to Risk Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Commonwealth Financial Corporation | $ | 691,993 |  |  | 11.46 | % |  | $ | 437,922 |  |  | 7.25 | % |  | $ | 513,426 |  |  | 8.50 | % |  | $ | 483,224 |  |  | 8.00 | %
First Commonwealth Bank | 658,861 |  |  | 10.94 |  |  | 436,467 |  |  | 7.25 |  |  | 511,720 |  |  | 8.50 |  |  | 481,619 |  |  | 8.00 |
Tier I Capital to Average Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Commonwealth Financial Corporation | $ | 691,993 |  |  | 9.74 | % |  | $ | 284,100 |  |  | 4.00 | % |  | $ | 284,100 |  |  | 4.00 | % |  | $ | 355,125 |  |  | 5.00 | %
First Commonwealth Bank | 658,861 |  |  | 9.30 |  |  | 283,344 |  |  | 4.00 |  |  | 283,344 |  |  | 4.00 |  |  | 354,180 |  |  | 5.00 |
Common Equity Tier I to Risk Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Commonwealth Financial Corporation | $ | 623,252 |  |  | 10.32 | % |  | $ | 347,317 |  |  | 5.75 | % |  | $ | 422,821 |  |  | 7.00 | % |  | $ | 392,620 |  |  | 6.50 | %
First Commonwealth Bank | 658,861 |  |  | 10.94 |  |  | 346,163 |  |  | 5.75 |  |  | 421,416 |  |  | 7.00 |  |  | 391,315 |  |  | 6.50 |
| Actual |  | Minimum Capital Required - Basel III Phase-In Schedule |  | Minimum Capital Required - Basel III Fully Phased-In |  | Required to be Considered Well Capitalized
| Capital Amount |  | Ratio |  | Capital Amount |  | Ratio |  | Capital Amount |  | Ratio |  | Capital Amount |  | Ratio
| (dollars in thousands)
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital to Risk Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Commonwealth Financial Corporation | $ | 687,554 |  |  | 12.28 | % |  | $ | 483,034 |  |  | 8.63 | % |  | $ | 588,042 |  |  | 10.50 | % |  | $ | 560,040 |  |  | 10.00 | %
First Commonwealth Bank | 617,076 |  |  | 11.06 |  |  | 481,248 |  |  | 8.63 |  |  | 585,867 |  |  | 10.50 |  |  | 557,969 |  |  | 10.00 |
Tier I Capital to Risk Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Commonwealth Financial Corporation | $ | 633,262 |  |  | 11.31 | % |  | $ | 371,026 |  |  | 6.63 | % |  | $ | 476,034 |  |  | 8.50 | % |  | $ | 448,032 |  |  | 8.00 | %
First Commonwealth Bank | 562,784 |  |  | 10.09 |  |  | 369,654 |  |  | 6.63 |  |  | 474,273 |  |  | 8.50 |  |  | 446,375 |  |  | 8.00 |
Tier I Capital to Average Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Commonwealth Financial Corporation | $ | 633,262 |  |  | 9.83 | % |  | $ | 257,776 |  |  | 4.00 | % |  | $ | 257,776 |  |  | 4.00 | % |  | $ | 322,220 |  |  | 5.00 | %
First Commonwealth Bank | 562,784 |  |  | 8.79 |  |  | 256,214 |  |  | 4.00 |  |  | 256,214 |  |  | 4.00 |  |  | 320,268 |  |  | 5.00 |
Common Equity Tier I to Risk Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Commonwealth Financial Corporation | $ | 563,262 |  |  | 10.06 | % |  | $ | 287,020 |  |  | 5.13 | % |  | $ | 392,028 |  |  | 7.00 | % |  | $ | 364,026 |  |  | 6.50 | %
First Commonwealth Bank | 562,784 |  |  | 10.09 |  |  | 285,959 |  |  | 5.13 |  |  | 390,578 |  |  | 7.00 |  |  | 362,680 |  |  | 6.50 |

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