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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Net income (loss)3true 3us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Adjustments to reconcile net income (loss) to net cash provided by operating activities:4false 4us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestmentsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse15670001567falsefalsefalse2truefalsefalse1419900014199falsefalsefalsexbrli:monetaryItemTypemonetaryThe sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. 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Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 false2Restricted stock amortization expense6false 4us-gaap_UnrealizedGainOnSecuritiesus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-2983000-2983falsefalsefalse2truefalsefalse211045000211045falsefalsefalsexbrli:monetaryItemTypemonetaryThe increase (decrease), resulting in a gain, in the difference between the fair value and the carrying value, or in the comparative fair values, of securities held at each balance sheet date, that was included in earnings for the period.No definition available.false2Unrealized loss (gain) on Residential mortgage-backed securities and other securities, net7false 4wmc_UnrealizedInterestIncomeSecuritiesPurchasedUnderAgreementsToResellwmc_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1falsefalsefalse00falsefalsefalse2truefalsefalse-711000-711falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the amount of unrealized interest income derived from securities purchased under agreements to resell.No definition available.false2Mark-to-market adjustments on linked transactions8false 4us-gaap_UnrealizedGainLossOnDerivativesus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse52690005269falsefalsefalse2truefalsefalse-90303000-90303falsefalsefalsexbrli:monetaryItemTypemonetaryThe net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 false2Mark-to-market adjustments on derivative instruments9false 4wmc_OtherGainLossOnResidentialMortgageBackedSecuritieswmc_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse8700087falsefalsefalse2truefalsefalse58010005801falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of adjustment resulting from difference between fair value and carrying amount of residential mortgage-backed securities during the reporting period.No definition available.false2Other loss on Residential mortgage-backed securities10false 4us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNetus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-1157000-1157falsefalsefalse2truefalsefalse1774300017743falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. 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This element refers to the gain (loss) included in earnings.No definition available.false2Realized gain on sale of swaptions, net14false 4wmc_RealizedGainLossOnExpirationOfOptionDerivativeswmc_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1falsefalsefalse00falsefalsefalse2truefalsefalse925000925falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the amount of realized gain or loss on expiration of option derivatives, net.No definition available.false2Realized loss on expiration of option derivatives, net15false 4wmc_RealizedGainLossOnLinkedTransactionwmc_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1falsefalsefalse00falsefalsefalse2truefalsefalse-3748000-3748falsefalsefalsexbrli:monetaryItemTypemonetaryThe difference between the book value and the sale price of securities as part of linked transaction. This element refers to the gain (loss) included in earnings.No definition available.false2Realized gain on linked transaction, net16false 4wmc_RealizedGainLossOnTerminationOfSwapswmc_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1falsefalsefalse00falsefalsefalse2truefalsefalse-8895000-8895falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the amount of realized gain or loss on termination of swaps.No definition available.false2Realized gain on termination of swaps17true 4us-gaap_IncreaseDecreaseInOperatingCapitalAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Changes in operating assets and liabilities:18false 5us-gaap_IncreaseDecreaseInAccruedInterestReceivableNetus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-7076000-7076falsefalsefalse2truefalsefalse22530002253falsefalsefalsexbrli:monetaryItemTypemonetaryThe increase (decrease) during the reporting period in the amount due from borrowers for interest payments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 false2Decrease (increase) in accrued interest receivable19false 5us-gaap_IncreaseDecreaseInOtherOperatingAssetsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-552000-552falsefalsefalse2truefalsefalse-406000-406falsefalsefalsexbrli:monetaryItemTypemonetaryThe increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 false2Increase in other assets20false 5us-gaap_IncreaseDecreaseInInterestPayableNetus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse10000001000falsefalsefalse2truefalsefalse-674000-674falsefalsefalsexbrli:monetaryItemTypemonetaryThe increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 false2Increase in accounts payable and accrued expenses22false 5us-gaap_IncreaseDecreaseInDueToRelatedPartiesus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse407000407falsefalsefalse2truefalsefalse9200092falsefalsefalsexbrli:monetaryItemTypemonetaryThe increase (decrease) during the reporting period in the aggregate amount of obligations to be paid to the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entities' management; an entity and its principal owners, management, or member of their immediate families; affiliates; or other parties with the ability to exert significant influence.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 false2Increase in payable to related party23false 3us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse13090001309falsefalsefalse2truefalsefalse9362000093620falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of net cash from (used in) the entity's continuing operations, excluding cash flows derived by the entity from its discontinued operations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. true2Net cash provided by operating activities24true 2us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Cash flows from investing activities:25false 3us-gaap_PaymentsToAcquireMortgageBackedSecuritiesMBSCategorizedAsAvailableForSaleus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-2158676000-2158676falsefalsefalse2truefalsefalse-1725304000-1725304falsefalsefalsexbrli:monetaryItemTypemonetaryThe cash outflow for the purchase of securities issued by a governmental agency or corporation (for example, GNMA or FHLMC) or by private issuers (for example, banks and mortgage banking enterprises) secured by and repaid from underlying mortgages, which were designated as available for sale when acquired.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3574-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26, 31 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 false2Purchase of Residential mortgage-backed securities and other securities26false 3wmc_PaymentForSecuritiesSoldUnderRepurchaseAgreementsToRepurchaseUnderlyingLinkedTransactionswmc_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1falsefalsefalse00falsefalsefalse2truefalsefalse-76408000-76408falsefalsefalsexbrli:monetaryItemTypemonetaryThe cash outflow for the purchase of securities underlying linked transactions.No definition available.false2Purchase of securities underlying linked transactions27false 3us-gaap_ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSaleus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse237390000237390falsefalsefalse2truefalsefalse22096070002209607falsefalsefalsexbrli:monetaryItemTypemonetaryThe cash inflow from the sale of securities issued by a governmental agency or corporation (for example, GNMA or FHLMC) or by private issuers (for example, banks and mortgage banking enterprises) secured by and repaid from underlying mortgages, which were designated as available for sale when acquired.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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Cash and cash equivalents end of period55true 2us-gaap_AdditionalCashFlowElementsAndSupplementalCashFlowInformationAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Supplemental disclosure of operating cash flow information:56false 3us-gaap_InterestPaidus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse446000446falsefalsefalse2truefalsefalse1168100011681falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of cash paid for interest during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 false2Interest paid57false 3wmc_InterestRateSwapsTerminatedNotSettledwmc_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse88950008895falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of cash received due to interest rate swaps terminated, not settled during the period.No definition available.false2Interest rate swaps terminated, not settled58false 3wmc_MortgageBackedSecuritiesRecordedUponUnlinkingOfLinkedTransactionswmc_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse5315900053159falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the mortgage-backed securities recorded upon unlinking of linked transactions.No definition available.false2Mortgage-backed securities recorded upon unlinking of linked transactions59true 2us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Supplemental disclosure of non-cash financing/investing activities:60false 3us-gaap_DeferredOfferingCostsus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse12000001200falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetarySpecific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6955238&loc=d3e105025-122735 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section A false2Offering costs to be settled with related party61false 3wmc_MortgageBackedSecuritiesSoldNotSettledwmc_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse102336000102336falsefalsefalse2truefalsefalse34650003465falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the receivables for RMBS sold for which settlement has not taken place.No definition available.false2Mortgage-backed securities sold, not settled62false 3wmc_MortgageBackedSecuritiesPurchasedNotSettledwmc_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-106019000-106019falsefalsefalse2truefalsefalse-22167000-22167falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the payables for RMBS purchased for which settlement has not taken place.No definition available.false2Mortgage-backed securities purchased, not settled63false 3wmc_MortgageBackedSecuritiesUsedToSettleSecuritiesYetToBeAnnouncedwmc_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse208817000208817falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the mortgage-backed securities used to settle securities, which are yet to be announced.No definition available.false2Mortgage-backed securities used to settle TBAs64false 3wmc_DividendsAndDistributionsDeclaredButNotYetPaidwmc_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1falsefalsefalse00falsefalsefalse2truefalsefalse2187800021878USD$falsetruefalsexbrli:monetaryItemTypemonetaryRepresents the future cash outflow to pay for dividends and distributions that have declared.No definition available.false2Dividends and distributions declared, not paidfalseStatement of Cash Flows (USD $)ThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.westernassetmcc.com/role/CashFlows264