Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net Income	$ 14,221us-gaap_NetIncomeLoss	$ 12,300us-gaap_NetIncomeLoss
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for credit losses	1,159us-gaap_ProvisionForLoanAndLeaseLosses	3,231us-gaap_ProvisionForLoanAndLeaseLosses
Deferred tax expense	4,219us-gaap_DeferredIncomeTaxExpenseBenefit	2,646us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation and amortization	1,899	4,310
Net gains on securities and other assets	(267)fcf_GainLossOnSecuritiesAndOtherAssets	(1,086)fcf_GainLossOnSecuritiesAndOtherAssets
Net amortization of premiums and discounts on securities	441	538
Net accretion of premiums and discounts on long term debt	0	(30)
Income from increase in cash surrender value of bank owned life insurance	(1,354)fcf_IncreaseInCashSurrenderValueofBOLI	(1,369)fcf_IncreaseInCashSurrenderValueofBOLI
(Increase) decrease in interest receivable	(127)	689
Mortgage loans originated for sale	(15,382)	0
Proceeds from sale of mortgage loans	15,472	0
Decrease in interest payable	(92)	(163)
Increase in income taxes payable	290	2,231
Other-net	(4,748)	(2,420)
Net cash provided by operating activities	15,731	20,877
Investing Activities
Payments to Acquire Held-to-maturity Securities	(29,616)	0
Proceeds from maturities and redemptions	50,568	101,125
Purchases	(500)	(114,706)
Purchases of FHLB stock	(13,801)	(6,579)
Proceeds from the redemption of FHLB stock	11,270	7,976
Proceeds from bank owned life insurance	291	939
Proceeds from sale of loans	0	716
Proceeds from sale of other assets	1,008	4,443
Net decrease in loans	9,540	26,564
Purchases of premises and equipment	(1,665)	(2,240)
Net cash provided by investing activities	27,095	18,238
Financing Activities
Net increase (decrease) in federal funds purchased	6,000	(500)
Net increase (decrease) in other short-term borrowings	13,644	(53,149)
Net (decrease) increase in deposits	(21,761)us-gaap_IncreaseDecreaseInDeposits	43,955us-gaap_IncreaseDecreaseInDeposits
Repayments of other long-term debt	(25,134)us-gaap_RepaymentsOfOtherLongTermDebt	(87)us-gaap_RepaymentsOfOtherLongTermDebt
Discount on dividend reinvestment plan purchases	0	(33)
Dividends paid	(6,407)us-gaap_PaymentsOfDividends	(6,618)us-gaap_PaymentsOfDividends
Purchase of treasury stock	(18,421)	(8,708)
Net cash used in financing activities	(52,079)	(25,140)
Net (decrease) increase in cash and cash equivalents	(9,253)	13,975
Cash and cash equivalents at January 1	74,538	77,439
Cash and cash equivalents at March 31	$ 65,285	$ 91,414

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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- Definition

The cash inflow for proceeds from life insurance policies for which the entity is the beneficiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

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-Glossary Investing Activities

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

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-Section 45

-Paragraph 11

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-SubTopic 10

-Section 45

-Paragraph 12

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- Definition

The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph (c)

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- Definition

Amount of cash inflow from sale of Federal Home Loan Bank (FHLB) stock.

+ References

No definition available.

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The cash inflow associated with the sale of loans receivables arising from the financing of goods and services.

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- Definition

The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 21

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-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (c)

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The cash inflow from the sale of other tangible or intangible assets used to produce goods or deliver services not otherwise defined in the taxonomy.

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

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- Definition

The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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