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Derivative Instruments - Schedule of settlement of fair value hedges (Details) (Fair value hedges, Deposit liabilities, USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Fair value hedges | Deposit liabilities
    
Derivative [Line Items]    
Cumulative reduction to interest expense $ 97,705xlgroup_FairValueHedgeCumulativeReductionToExpense
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ xlgroup_DerivativeInstrumentsHedgedItemsAxis
= xlgroup_DepositLiabilitiesMember		 $ 41,270xlgroup_FairValueHedgeCumulativeReductionToExpense
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ xlgroup_DerivativeInstrumentsHedgedItemsAxis
= xlgroup_DepositLiabilitiesMember
Remaining balance $ 135,490xlgroup_FairValueHedgeRemainingBalance
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ xlgroup_DerivativeInstrumentsHedgedItemsAxis
= xlgroup_DepositLiabilitiesMember		 $ 191,925xlgroup_FairValueHedgeRemainingBalance
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ xlgroup_DerivativeInstrumentsHedgedItemsAxis
= xlgroup_DepositLiabilitiesMember
Weighted average years remaining to maturity 22 years 8 months 12 days 22 years 2 months 12 days