XML 117 R80.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Impairment of Investment Securities - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 Security Bank | Dec. 31, 2011 | Dec. 31, 2010
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Non-credit related gains on securities | $ 2,200,000 | $ 400,000 |
Corporate/Mortgage-Backed Securities, Amortized cost | 1,169,613,000 | 1,140,212,000 |
Corporate/Mortgage-Backed Securities, Estimated fair value | 1,171,303,000 | 1,142,776,000 |
Gross unrealized loss | 28,960,000 | 32,486,000 |
Available for sale securities book value | 51,866,000 |  |
Number of banks and other financial institutions comprising the security | 335 |  |
Number of pooled securities representing senior tranches | 2 |  |
Amount of pooled issues that remained above investment grade | 2,200,000 |  |
Amount of book value of the pooled issues | 51,900,000 |  |
Collateral issued by financial institutions | 15,000,000,000 |  |
Estimate of future cash flows prepayment percentage in year three | 40.00% |  |
Estimate of future cash flows prepayment percentage thereafter | 2.00% |  |
Coupon interest rate | 7.00% |  |
Prepayment rate | 5.00% |  |
Probability of default | 100.00% |  |
Projected recovery rate | 0.00% |  |
Probability percentage assigned to default bank subject to market indicators | 10.00% |  |
Probability percentage assigned to default bank | 100.00% |  |
Excess recognized as an adjustment to yield | (1,462,000) | (114,000) | 0
Minimum [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Subordinated tranches range | 7.00% |  |
Total principal amount of the respective securities | 5.00% |  |
Excess subordination as a percentage of current performing collateral | 6.00% |  |
Collateral issued by financial institutions | 15,000,000,000 |  |
Probabilities for performing collateral range | 0.33% |  |
Excess percent value of future cash flows over current book value | 13.00% |  |
Maximum [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Subordinated tranches range | 35.00% |  |
Excess subordination as a percentage of current performing collateral | 573.00% |  |
Collateral issued by financial institutions | 2,000,000,000 |  |
Probabilities for performing collateral range | 75.00% |  |
Excess percent value of future cash flows over current book value | 148.00% |  |
Over fifteen billion [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Prepayment rate | 100.00% |  |
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Pooled trust preferred collateralized debt obligations | 98.00% |  |
Corporate/Mortgage-Backed Securities, Amortized cost | 51,866,000 | 54,762,000 |
Corporate/Mortgage-Backed Securities, Estimated fair value | 23,373,000 | 22,980,000 |
Gross unrealized loss | 28,496,000 | 31,785,000 |
Nonperforming securities | 15,800,000 |  |
Obligations of U.S. Government [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total unrealized losses | 2.00% |  |
Equities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Corporate/Mortgage-Backed Securities, Amortized cost | 1,859,000 | 1,860,000 |
Corporate/Mortgage-Backed Securities, Estimated fair value | 1,975,000 | 1,860,000 |
Gross unrealized loss | 0 | 0 |
Impairment recognized on equity securities | 0 | 0 |
Other than-temporary impairment charge |  |  | 400,000
Corporate Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Corporate/Mortgage-Backed Securities, Amortized cost | 6,700,000 | 11,800,000 |
Corporate/Mortgage-Backed Securities, Estimated fair value | 7,000,000 | 11,400,000 |
Gross unrealized loss |  | 600,000 |
Trust preferred collateralized debt obligations [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Corporate/Mortgage-Backed Securities, Estimated fair value | 23,400,000 |  |
Available for sale securities book value | $ 51,900,000 |  |
Percentage of Current Performing Collateral | 0.00% |  |

X
- Definition Amount of book value of the pooled issues. + References No definition available. + Details
Name: | fcf_AmountOfBookValueOfPooledIssues
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of pooled issues that remained above investment grade. + References No definition available. + Details
Name: | fcf_AmountOfPooledIssuesThatRemainedAboveInvestmentGrade
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Asset Size Of Financial Institution + References No definition available. + Details
Name: | fcf_AssetSizeOfFinancialInstitution
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Assets Under Management Which Are Collateralized Debt Obligations Percentage + References No definition available. + Details
Name: | fcf_AssetsUnderManagementWhichAreCollateralizedDebtObligationsPercentage
Namespace Prefix: | fcf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Available for sale securities book value. + References No definition available. + Details
Name: | fcf_AvailableForSaleSecuritiesBookValue
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Coupon Interest Rate + References No definition available. + Details
Name: | fcf_CouponInterestRate
Namespace Prefix: | fcf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Estimate of future cash flows prepayment percentage in year three. + References No definition available. + Details
Name: | fcf_EstimateOfFutureCashFlowsPercentageInYearThree
Namespace Prefix: | fcf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimate of future cash flows prepayment percentage thereafter. + References No definition available. + Details
Name: | fcf_EstimateOfFutureCashFlowsPrepaymentPercentageThereafter
Namespace Prefix: | fcf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Excess present value of future cash flows over our current book value. + References No definition available. + Details
Name: | fcf_ExcessPresentValueOfFutureCashFlowsOverOurCurrentBookValue
Namespace Prefix: | fcf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Excess subordination as a percentage of current performing collateral. + References No definition available. + Details
Name: | fcf_ExcessSubordinationAsPercentageOfCurrentPerformingCollateral
Namespace Prefix: | fcf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Impairment Charges + References No definition available. + Details
Name: | fcf_ImpairmentCharges
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Available-for-sale securities recognized on a nonaccrual basis due to performance of the asset. + References No definition available. + Details
Name: | fcf_NonaccrualAvailableForSaleSecurities
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Non-credit related gains on securities + References No definition available. + Details
Name: | fcf_NonCreditRelatedGainsOnSecurities
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of banks and other financial institutions comprising the security. + References No definition available. + Details
Name: | fcf_NumberOfBanksAndOtherFinancialInstitutionsComprisingSecurity
Namespace Prefix: | fcf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of pooled securities representing senior tranches. + References No definition available. + Details
Name: | fcf_NumberOfPooledSecuritiesRepresentingSeniorTranches
Namespace Prefix: | fcf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Current performing collateral related to the security. + References No definition available. + Details
Name: | fcf_PercentageOfCurrentPerformingCollateral
Namespace Prefix: | fcf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of principal amount in pooled security securities. + References No definition available. + Details
Name: | fcf_PercentageOfPrincipalAmountInPooledSecuritySecurities
Namespace Prefix: | fcf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage Of Total Unrealized Losses + References No definition available. + Details
Name: | fcf_PercentageOfTotalUnrealizedLosses
Namespace Prefix: | fcf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Probabilities for performing collateral range. + References No definition available. + Details
Name: | fcf_ProbabilitiesForPerformingCollateralRange
Namespace Prefix: | fcf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Probability of default. + References No definition available. + Details
Name: | fcf_ProbabilityOfDefault
Namespace Prefix: | fcf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Probability percentage assigned to default bank. + References No definition available. + Details
Name: | fcf_ProbabilityPercentageAssignedToDefaultBank
Namespace Prefix: | fcf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Probability percentage assigned to default bank subject to market indicators. + References No definition available. + Details
Name: | fcf_ProbabilityPercentageAssignedToDefaultBankSubjectToMarketIndicators
Namespace Prefix: | fcf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Projected recovery rate. + References No definition available. + Details
Name: | fcf_ProjectedRecoveryRate
Namespace Prefix: | fcf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Subordinated tranches range. + References No definition available. + Details
Name: | fcf_SubordinatedTranchesRange
Namespace Prefix: | fcf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
Name: | us-gaap_AvailableForSaleSecuritiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLosses1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsPrepaymentRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held due to increases in cash flows expected to be collected and recognized over the remaining life of the security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27340-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 18B -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security because of the sale of impaired securities during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27340-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 18B -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration