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Securities Purchased Under Agreements To Resell and Investment Securities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Fair value of securities held as collateral		$ 64.6us-gaap_SecuritiesHeldAsCollateralAtFairValue
Puerto Rico Government obligation with mandatory tender offer repaid by user	98.7ofg_VariableRateDemandObligation
Investments Guaranteed by US Treasury and Sponsored Agencies in Unrealized Loss on Position	336.3ofg_InvestmentsGuaranteedByUsTreasuryAndSponsoredAgenciesinUnrealizedLossPosition
Investments Guaranteed by Puerto Rico Government and its Political Subdivisions in Unrealized Loss On Position	$ 20.9ofg_InvestmentsGuaranteedByPuertoRicoGovernmentAndItsPoliticalSubdivisionsInUnrealizedLossOnPosition
Investments Guaranteed By Us Treasury And Sponsored Agencies in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position	94.00%ofg_Investmentsguaranteedbyustreasuryandsponsoredagenciesinunrealizedlosspositionpercentagetototalinvestmentinunrealizedlossposition
Investments Guaranteed By Puerto Rico Government and Its Political Subdivisions in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position	6.00%ofg_InvestmentsGuaranteedByPuertoRicoGovernmentAndItsPoliticalSubdivisionsInUnrealizedLossPositionPercentageToTotalInvestmentInUnrealizedLossPosition
Minimum Government Bond Probability of Default	2.509%ofg_MinimumGovernmentBondProbabilityOfDefault
Maximum GovernmentBond Probability Of Default	15.34%ofg_MaximumGovernmentbondProbabilityOfDefault
Minimum Government Bond Recovery Rate	84.66%ofg_MinimumGovernmentBondRecoveryRate
Maximum Government Bond Recovery Rate	97.491%ofg_MaximumGovernmentBondRecoveryRate

X

- Definition

Investments in Unrealized Loss on Positions Guaranteed by Puerto Rico Government and its political subdivisions subject to credit risk and decline on market value due to puerto Rico Government market conditions.

+ References

No definition available.

+ Details

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X

- Definition

Investments guaranteed by Puerto Rico Government and its political subdivisions in unrealized loss position percentage to total investment in unrealized loss position

+ References

No definition available.

+ Details

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X

- Definition

Investments in unrealized loss on positions guaranteed by US Treasury and sponsored agencies which are not subject to credit risk due to market conditions.

+ References

No definition available.

+ Details

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- Definition

Investments guaranteed by US Treasury and sponsored agencies in unrealized loss position percentage to total investment in unrealized loss position

+ References

No definition available.

+ Details

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- Definition

Maximum percentage amount of likelihood a government bond will not be repaid and instead default.

+ References

No definition available.

+ Details

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- Definition

Maximum percentage rate of likelihood a government bond will be recovered.

+ References

No definition available.

+ Details

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- Definition

Minimum percentage amount of likelihood a government bond will not be repaid and instead default.

+ References

No definition available.

+ Details

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- Definition

Minimum percentage rate of likelihood a government bond will be recovered.

+ References

No definition available.

+ Details

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X

- Definition

Debt securities that permit the holder to require the trustee or tender agent to repurchase the security at specified dates before maturity. This type of bond is also known as a multimaturity bond, an option tender bond, or a put bond.

+ References

No definition available.

+ Details

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- Details

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- Definition

The carrying amount (fair value) as of the balance sheet date of securities held that had been pledged by counterparties under financing and lending arrangements, pursuant to which the entity has the right by agreement or custom to sell or re-pledge such securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5086-111524

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