| **CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $)In Thousands, except Share data, unless otherwise specified** | Total                                                                                          | Common Stock [Member]                                                                                                                                          | Additional Paid-in-Capital [Member]                                                                                                                                          | Retained Earnings [Member]                                                                                                                                                | Accumulated Other Comprehensive Income (Loss), net [Member]                                                                                    | Treasury Stock [Member]                                                                                                                                              | Unearned ESOP Shares [Member]                                                                                                                                    |
|-----------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Beginning balance at Dec. 31, 2011                                                                                                | $ 758,543us-gaap_StockholdersEquity                                                            | $ 105,563us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                                          | $ 365,868us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                            | $ 294,056us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                                | $ 2,001us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                    | $ (7,345)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                              | $ (1,600)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_DeferredCompensationShareBasedPaymentsMember                                 |
| Beginning balance, Shares Outstanding at Dec. 31, 2011                                                                            |                                                                                           | 104,916,994us-gaap_CommonStockSharesOutstanding/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                              |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                                    |                                                                                           |                                                                                                                                                           |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Net Income                                                                                                                        | 41,954us-gaap_NetIncomeLoss                                                                    |                                                                                                                                                           |                                                                                                                                                                         | 41,954us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                                        |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Total other comprehensive (loss) Income                                                                                           | (742)us-gaap_OtherComprehensiveIncomeLossNetOfTax                                              |                                                                                                                                                           |                                                                                                                                                                         |                                                                                                                                                                      | (742)us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember    |                                                                                                                                                                 |                                                                                                                                                             |
| Cash dividends declared                                                                                                           | (18,759)us-gaap_DividendsCommonStockCash                                                       |                                                                                                                                                           |                                                                                                                                                                         | (18,759)us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                           |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Net decrease in unearned ESOP shares                                                                                              | 1,600us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan                            |                                                                                                                                                           |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 | 1,600us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan/ us-gaap_StatementEquityComponentsAxis= us-gaap_DeferredCompensationShareBasedPaymentsMember |
| ESOP market value adjustment                                                                                                      | (474)us-gaap_AdjustmentsToAdditionalPaidInCapitalMarkToMarket                                  |                                                                                                                                                           | (474)us-gaap_AdjustmentsToAdditionalPaidInCapitalMarkToMarket/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                  |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Discount on dividend reinvestment plan purchases                                                                                  | (92)fcf_DiscountOnDividendReinvestmentPlanPurchases                                            |                                                                                                                                                           | (92)fcf_DiscountOnDividendReinvestmentPlanPurchases/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                            |                                                                                                                                                                 |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Tax benefit of stock options exercised                                                                                            | 1us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation               |                                                                                                                                                           | 1us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember               |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Treasury stock acquired                                                                                                           | (37,464)us-gaap_TreasuryStockValueAcquiredCostMethod                                           |                                                                                                                                                           |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           | (37,464)us-gaap_TreasuryStockValueAcquiredCostMethod/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                             |                                                                                                                                                             |
| Treasury stock acquired, Shares Outstanding                                                                                       |                                                                                           | (5,662,700)us-gaap_TreasuryStockSharesAcquired/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                               |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Treasury stock reissued                                                                                                           | 1,028us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued                                 |                                                                                                                                                           | 0us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                     | (379)us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                     |                                                                                                                                           | 1,407us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                   |                                                                                                                                                             |
| Treasury stock reissued, Shares Outstanding                                                                                       |                                                                                           | 155,200us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                            |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Restricted stock                                                                                                                  | 412us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions | 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember | 51us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember  | (1,264)us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember |                                                                                                                                           | 1,625us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember |                                                                                                                                                             |
| Restricted stock, Shares Outstanding                                                                                              |                                                                                           | 220,000fcf_RestrictedStock/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                                                   |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Ending balance at Dec. 31, 2012                                                                                                   | 746,007us-gaap_StockholdersEquity                                                              | 105,563us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                                            | 365,354us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                              | 315,608us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                                  | 1,259us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                      | (41,777)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                               | 0us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_DeferredCompensationShareBasedPaymentsMember                                         |
| Ending balance, Shares Outstanding at Dec. 31, 2012                                                                               |                                                                                           | 99,629,494us-gaap_CommonStockSharesOutstanding/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                               |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                                    |                                                                                           |                                                                                                                                                           |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Net Income                                                                                                                        | 41,482us-gaap_NetIncomeLoss                                                                    |                                                                                                                                                           |                                                                                                                                                                         | 41,482us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                                        |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Total other comprehensive (loss) Income                                                                                           | (21,847)us-gaap_OtherComprehensiveIncomeLossNetOfTax                                           |                                                                                                                                                           |                                                                                                                                                                         |                                                                                                                                                                      | (21,847)us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember |                                                                                                                                                                 |                                                                                                                                                             |
| Cash dividends declared                                                                                                           | (22,344)us-gaap_DividendsCommonStockCash                                                       |                                                                                                                                                           |                                                                                                                                                                         | (22,344)us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                           |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Discount on dividend reinvestment plan purchases                                                                                  | (112)fcf_DiscountOnDividendReinvestmentPlanPurchases                                           |                                                                                                                                                           | (112)fcf_DiscountOnDividendReinvestmentPlanPurchases/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                           |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Treasury stock acquired                                                                                                           | (32,217)us-gaap_TreasuryStockValueAcquiredCostMethod                                           |                                                                                                                                                           |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           | (32,217)us-gaap_TreasuryStockValueAcquiredCostMethod/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                             |                                                                                                                                                             |
| Treasury stock acquired, Shares Outstanding                                                                                       |                                                                                           | (4,462,638)us-gaap_TreasuryStockSharesAcquired/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                               |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Treasury stock reissued                                                                                                           | 176us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued                                   |                                                                                                                                                           | 0us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                     | 0us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                         |                                                                                                                                           | 176us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                     |                                                                                                                                                             |
| Treasury stock reissued, Shares Outstanding                                                                                       |                                                                                           | 25,359us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                             |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Restricted stock                                                                                                                  | 552us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions | 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember | 91us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember  | 2us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember       |                                                                                                                                           | 459us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember   |                                                                                                                                                             |
| Restricted stock, Shares Outstanding                                                                                              |                                                                                           | 53,000fcf_RestrictedStock/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                                                    |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Ending balance at Dec. 31, 2013                                                                                                   | 711,697us-gaap_StockholdersEquity                                                              | 105,563us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                                            | 365,333us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                              | 334,748us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                                  | (20,588)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                   | (73,359)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                               |                                                                                                                                                             |
| Ending balance, Shares Outstanding at Dec. 31, 2013                                                                               | 95,245,215us-gaap_CommonStockSharesOutstanding                                                 | 95,245,215us-gaap_CommonStockSharesOutstanding/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                               |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                                    |                                                                                           |                                                                                                                                                           |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Net Income                                                                                                                        | 44,453us-gaap_NetIncomeLoss                                                                    |                                                                                                                                                           |                                                                                                                                                                         | 44,453us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                                        |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Total other comprehensive (loss) Income                                                                                           | 16,089us-gaap_OtherComprehensiveIncomeLossNetOfTax                                             |                                                                                                                                                           |                                                                                                                                                                         |                                                                                                                                                                      | 16,089us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember   |                                                                                                                                                                 |                                                                                                                                                             |
| Cash dividends declared                                                                                                           | (26,174)us-gaap_DividendsCommonStockCash                                                       |                                                                                                                                                           |                                                                                                                                                                         | (26,174)us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                           |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Discount on dividend reinvestment plan purchases                                                                                  | (65)fcf_DiscountOnDividendReinvestmentPlanPurchases                                            |                                                                                                                                                           | (65)fcf_DiscountOnDividendReinvestmentPlanPurchases/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                            |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Treasury stock acquired                                                                                                           | (30,956)us-gaap_TreasuryStockValueAcquiredCostMethod                                           |                                                                                                                                                           |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           | (30,956)us-gaap_TreasuryStockValueAcquiredCostMethod/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                             |                                                                                                                                                             |
| Treasury stock acquired, Shares Outstanding                                                                                       |                                                                                           | (3,636,634)us-gaap_TreasuryStockSharesAcquired/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                               |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Treasury stock reissued                                                                                                           | 192us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued                                   |                                                                                                                                                           | 35us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                    | 0us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                         |                                                                                                                                           | 157us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                     |                                                                                                                                                             |
| Treasury stock reissued, Shares Outstanding                                                                                       |                                                                                           | 21,960us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                             |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Restricted stock                                                                                                                  | 909us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions | 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember | 312us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember | 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember       |                                                                                                                                           | 597us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember   |                                                                                                                                                             |
| Restricted stock, Shares Outstanding                                                                                              |                                                                                           | 92,487fcf_RestrictedStock/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                                                    |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |
| Ending balance at Dec. 31, 2014                                                                                                   | $ 716,145us-gaap_StockholdersEquity                                                            | $ 105,563us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                                          | $ 365,615us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                            | $ 353,027us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                                | $ (4,499)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                  | $ (103,561)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                            |                                                                                                                                                             |
| Ending balance, Shares Outstanding at Dec. 31, 2014                                                                               | 91,723,028us-gaap_CommonStockSharesOutstanding                                                 | 91,723,028us-gaap_CommonStockSharesOutstanding/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                               |                                                                                                                                                                         |                                                                                                                                                                      |                                                                                                                                           |                                                                                                                                                                 |                                                                                                                                                             |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow associated with the 5% discount on the shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.
+ References
No definition available.
+ Details**Name:**fcf_DiscountOnDividendReinvestmentPlanPurchases**Namespace Prefix:**fcf_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Restricted stock.
+ References
No definition available.
+ Details**Name:**fcf_RestrictedStock**Namespace Prefix:**fcf_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase (decrease) to additional paid in capital (APIC) resulting from changes in fair value of common and preferred stock issued to employee benefit trust but unearned.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770
+ Details**Name:**us-gaap_AdjustmentsToAdditionalPaidInCapitalMarkToMarket**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Changes in additional paid in capital related to exercise of share-based payments awards (such as stock options) and the amount of recognized equity-based compensation during the period (such as nonvested shares).
+ References
No definition available.
+ Details**Name:**us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945
+ Details**Name:**us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5
+ Details**Name:**us-gaap_CommonStockSharesOutstanding**Namespace Prefix:**us-gaap_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
+ References
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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Amount after tax and reclassification adjustments of other comprehensive income (loss).
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| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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| - Definition
Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.
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Aggregate value of stock issued during the period as a result of employee stock ownership plan (ESOP).
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Equity impact of the value of treasury stock (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.
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Number of shares that have been repurchased during the period and are being held in treasury.
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| - Definition
Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.
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