CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities
Net Income	$ 44,453us-gaap_NetIncomeLoss	$ 41,482us-gaap_NetIncomeLoss	$ 41,954us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	11,196us-gaap_ProvisionForLoanAndLeaseLosses	19,227us-gaap_ProvisionForLoanAndLeaseLosses	20,544us-gaap_ProvisionForLoanAndLeaseLosses
Deferred tax expense	4,862us-gaap_DeferredIncomeTaxExpenseBenefit	12,704us-gaap_DeferredIncomeTaxExpenseBenefit	2,551us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation and amortization	13,721	11,090	7,912
Net losses on securities and other assets	2,832fcf_GainLossOnSecuritiesAndOtherAssets	431fcf_GainLossOnSecuritiesAndOtherAssets	1,838fcf_GainLossOnSecuritiesAndOtherAssets
Net amortization of premiums and discounts on securities	2,233	543	1,381
Net amortization of premiums and discounts on long-term debt	(37)	(117)	(113)
Income from increase in cash surrender value of bank owned life insurance	5,275fcf_ProceedsfromBankOwnedLifeInsurance	5,539fcf_ProceedsfromBankOwnedLifeInsurance	5,850fcf_ProceedsfromBankOwnedLifeInsurance
Payments for Origination of Mortgage Loans Held-for-sale	(17,697)	0	0
Proceeds from Sale of Mortgage Loans Held-for-sale	15,598	0	0
Decrease in interest receivable	542	921	2,689
Decrease in interest payable	(404)	(1,172)	(1,280)
Decrease in prepaid FDIC insurance	0	9,205	4,693
Decrease (increase) in income taxes payable	1,860	(615)	6,484
Other—net	8,253	(2,426)	(4,079)
Net cash provided by operating activities	82,137	85,734	78,724
Transactions with securities available for sale:
Proceeds from sales	132,868	671	0
Proceeds from maturities and redemptions	242,895	356,667	574,846
Purchases	(339,649)	(539,894)	(605,435)
Purchases of FHLB stock	(40,920)	(18,120)	0
Proceeds from the redemption of FHLB stock	31,819	10,904	11,568
Proceeds from bank owned life insurance	2,080	2,092	2,501
Proceeds from the sale of loans	3,112	20,760	15,981
Proceeds from sales of other assets	12,882	12,713	17,660
Payments to Acquire Businesses, Net of Cash Acquired	(3,042)	0	0
Net increase in loans	(195,120)	(143,438)	(178,321)
Purchases of premises and equipment	(10,980)	(9,635)	(10,182)
Net cash used in investing activities	(164,055)	(307,280)	(171,382)
Financing Activities
Net decrease in federal funds purchased	(7,000)	(18,000)	(41,300)
Net increase in other short-term borrowings	486,261	288,387	84,750
Net (decrease) increase in deposits	(288,352)us-gaap_IncreaseDecreaseInDeposits	46,006us-gaap_IncreaseDecreaseInDeposits	53,256us-gaap_IncreaseDecreaseInDeposits
Repayments of other long-term debt	(59,889)us-gaap_RepaymentsOfOtherLongTermDebt	(29,969)us-gaap_RepaymentsOfOtherLongTermDebt	(25,480)us-gaap_RepaymentsOfOtherLongTermDebt
Proceeds from issuance of long-term debt	5,000	0	100,000
Repayments of subordinated debentures	0	(34,702)	0
Discount on dividend reinvestment plan purchases	(65)	(112)	(92)
Dividends paid	(26,174)us-gaap_PaymentsOfDividends	(22,344)us-gaap_PaymentsOfDividends	(18,759)us-gaap_PaymentsOfDividends
Proceeds from reissuance of treasury stock	192us-gaap_ProceedsFromSaleOfTreasuryStock	176us-gaap_ProceedsFromSaleOfTreasuryStock	1,028us-gaap_ProceedsFromSaleOfTreasuryStock
Purchase of treasury stock	(30,956)	(33,439)	(36,242)
Stock option tax benefit	0fcf_StockOptionTaxBenefit	0fcf_StockOptionTaxBenefit	1fcf_StockOptionTaxBenefit
Net cash provided by financing activities	79,017	196,003	117,162
Net (decrease) increase in cash and cash equivalents	(2,901)	(25,543)	24,504
Cash and cash equivalents at January 1	77,439	102,982	78,478
Cash and cash equivalents at December 31	$ 74,538	$ 77,439	$ 102,982

Gain (loss) on securities and other assets.

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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.

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Proceeds from Bank Owned Life Insurance

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Stock option tax benefit.

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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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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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The increase (decrease) during the reporting period in the amount of outstanding money paid in advance for goods or services that bring economic benefits for future periods.

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The cash outflow to reacquire common stock during the period.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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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.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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- Definition

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

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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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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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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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- Definition

Amount of cash inflow from sale of Federal Reserve Bank (FRB) stock.

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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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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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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

The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity.

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-Publisher FASB

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

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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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