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Regulatory Restrictions and Capital Adequacy (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 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 |
| 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, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital to Risk Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Commonwealth Financial Corporation | $ | 682,199 |  |  | 12.25 | % |  | $ | 445,650 |  |  | 8.00 | % |  | $ | 584,915 |  |  | 10.50 | % |  | $ | 557,062 |  |  | 10.00 | %
First Commonwealth Bank | 656,244 |  |  | 11.78 |  |  | 445,642 |  |  | 8.00 |  |  | 584,905 |  |  | 10.50 |  |  | 557,052 |  |  | 10.00 |
Tier I Capital to Risk Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Commonwealth Financial Corporation | $ | 626,939 |  |  | 11.25 | % |  | $ | 334,237 |  |  | 6.00 | % |  | $ | 473,503 |  |  | 8.50 | % |  | $ | 445,650 |  |  | 8.00 | %
First Commonwealth Bank | 600,984 |  |  | 10.79 |  |  | 334,231 |  |  | 6.00 |  |  | 473,494 |  |  | 8.50 |  |  | 445,642 |  |  | 8.00 |
Tier I Capital to Average Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Commonwealth Financial Corporation | $ | 626,939 |  |  | 9.85 | % |  | $ | 254,631 |  |  | 4.00 | % |  | $ | 254,631 |  |  | 4.00 | % |  | $ | 318,289 |  |  | 5.00 | %
First Commonwealth Bank | 600,984 |  |  | 9.46 |  |  | 254,095 |  |  | 4.00 |  |  | 254,095 |  |  | 4.00 |  |  | 317,618 |  |  | 5.00 |
Common Equity Tier I to Risk Weighted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Commonwealth Financial Corporation | $ | 556,939 |  |  | 10.00 | % |  | $ | 250,678 |  |  | 4.50 | % |  | $ | 389,944 |  |  | 7.00 | % |  | $ | 362,091 |  |  | 6.50 | %
First Commonwealth Bank | 535,814 |  |  | 9.62 |  |  | 250,673 |  |  | 4.50 |  |  | 389,937 |  |  | 7.00 |  |  | 362,084 |  |  | 6.50 |

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958577-112826 + Details
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