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Earnings per Share - Composition of Weighted-Average Common Shares (Denominator) Used in Basic and Diluted Earnings Per Share (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Weighted average common shares issued	105,563,455fcf_WeightedAverageNumberOfSharesIssuedBasicAndDiluted	105,563,455fcf_WeightedAverageNumberOfSharesIssuedBasicAndDiluted	105,563,455fcf_WeightedAverageNumberOfSharesIssuedBasicAndDiluted
Average treasury shares	(12,294,217)us-gaap_WeightedAverageNumberOfSharesTreasuryStock	(8,363,083)us-gaap_WeightedAverageNumberOfSharesTreasuryStock	(1,456,953)us-gaap_WeightedAverageNumberOfSharesTreasuryStock
Averaged unearned ESOP shares	0us-gaap_WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased	0us-gaap_WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased	(38,393)us-gaap_WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased
Average unearned nonvested shares	(154,584)us-gaap_WeightedAverageNumberOfSharesContingentlyIssuable	(172,215)us-gaap_WeightedAverageNumberOfSharesContingentlyIssuable	(182,713)us-gaap_WeightedAverageNumberOfSharesContingentlyIssuable
Weighted average common shares and common stock equivalents used to calculate basic earnings per share	93,114,654us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	97,028,157us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	103,885,396us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share	0fcf_WeightedAverageNumberOfAdditionalSharesNonVested	1,675fcf_WeightedAverageNumberOfAdditionalSharesNonVested	171fcf_WeightedAverageNumberOfAdditionalSharesNonVested
Additional common stock equivalents (stock options) used to calculate diluted earnings per share	0fcf_WeightedAverageNumberOfAdditionalShares	0fcf_WeightedAverageNumberOfAdditionalShares	96fcf_WeightedAverageNumberOfAdditionalShares
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share	93,114,654us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	97,029,832us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	103,885,663us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

X

- Definition

Weighted average number of additional shares.

+ References

No definition available.

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Weighted average number of additional shares non vested.

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- Definition

Weighted average number of shares issued, basic and diluted.

+ References

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256

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- Definition

Shares issuable for little or no cash consideration upon the satisfaction of certain conditions (contingently issuable shares) are considered outstanding common shares and included in the computation of basic Earnings Per Share as of the date that all necessary conditions have been satisfied (in essence, when issuance of the shares is no longer contingent). Outstanding common shares that are contingently returnable (that is, subject to recall) are treated in the same manner as contingently issuable shares. Contingently issuable shares include shares that (a) will be issued in the future upon the satisfaction of specified conditions, (b) have been placed in escrow and all or part must be returned if specified conditions are not met, or (c) have been issued but the holder must return all or part if specified conditions are not met. The number of contingently issuable shares is determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2646-109256

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- Definition

Number of employee stock ownership plan (ESOP) shares that have not been committed to be released determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6418601&loc=d3e17400-113927

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

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-Section 45

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-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256



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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

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Number of shares of treasury stock determined by relating the portion of time within a reporting period that treasury shares have been outstanding to the total time in that period. Treasury stock is stock that the Entity has issued but subsequently reacquired.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256

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