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Financial Information by Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 65,251 us-gaap_InterestAndDividendIncomeOperating |  | $ 63,351 us-gaap_InterestAndDividendIncomeOperating | $ 57,993 us-gaap_InterestAndDividendIncomeOperating | $ 55,475 us-gaap_InterestAndDividendIncomeOperating | $ 57,492 us-gaap_InterestAndDividendIncomeOperating |  | $ 57,420 us-gaap_InterestAndDividendIncomeOperating | $ 57,719 us-gaap_InterestAndDividendIncomeOperating | $ 53,525 us-gaap_InterestAndDividendIncomeOperating | $ 242,070 us-gaap_InterestAndDividendIncomeOperating |  | $ 226,156 us-gaap_InterestAndDividendIncomeOperating |  | $ 231,384 us-gaap_InterestAndDividendIncomeOperating
Interest expense | (23,903)us-gaap_InterestExpense |  | (23,350)us-gaap_InterestExpense | (21,151)us-gaap_InterestExpense | (19,059)us-gaap_InterestExpense | (19,528)us-gaap_InterestExpense |  | (21,725)us-gaap_InterestExpense | (21,416)us-gaap_InterestExpense | (18,302)us-gaap_InterestExpense | (87,463)us-gaap_InterestExpense |  | (80,971)us-gaap_InterestExpense |  | (120,705)us-gaap_InterestExpense
Net interest income (loss) | 41,348 us-gaap_InterestIncomeExpenseNet |  | 40,001 us-gaap_InterestIncomeExpenseNet | 36,842 us-gaap_InterestIncomeExpenseNet | 36,416 us-gaap_InterestIncomeExpenseNet | 37,964 us-gaap_InterestIncomeExpenseNet |  | 35,695 us-gaap_InterestIncomeExpenseNet | 36,303 us-gaap_InterestIncomeExpenseNet | 35,223 us-gaap_InterestIncomeExpenseNet | 154,607 us-gaap_InterestIncomeExpenseNet |  | 145,185 us-gaap_InterestIncomeExpenseNet |  | 110,679 us-gaap_InterestIncomeExpenseNet
Provision for loan losses |  |  |  |  |  |  |  |  |  |  | (961)us-gaap_ProvisionForLoanLeaseAndOtherLosses |  | (4,737)us-gaap_ProvisionForLoanLeaseAndOtherLosses |  | (3,648)us-gaap_ProvisionForLoanLeaseAndOtherLosses
Non interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage banking activities, net |  |  |  |  |  |  |  |  |  |  | 34,938 rwt_MortgageBankingActivitiesNet |  | 102,494 rwt_MortgageBankingActivitiesNet |  | 36,593 rwt_MortgageBankingActivitiesNet
MSR income (loss) |  |  |  |  |  |  |  |  |  |  | (4,261)rwt_MortgageServicingRightsIncomeIncludingMarketValuationChangesOfMSRs |  | 20,309 rwt_MortgageServicingRightsIncomeIncludingMarketValuationChangesOfMSRs |  | (1,391)rwt_MortgageServicingRightsIncomeIncludingMarketValuationChangesOfMSRs
Other market valuation adjustments, net |  |  |  |  |  |  |  |  |  |  | (10,146)rwt_OtherMarketValuationAdjustments |  | (5,709)rwt_OtherMarketValuationAdjustments |  | 1,539 rwt_OtherMarketValuationAdjustments
Realized gains, net |  |  |  |  |  |  |  |  |  |  | 15,478 us-gaap_RealizedInvestmentGainsLosses |  | 25,259 us-gaap_RealizedInvestmentGainsLosses |  | 54,921 us-gaap_RealizedInvestmentGainsLosses
Total non interest income, net | 10,686 us-gaap_NoninterestIncome |  | 28,519 us-gaap_NoninterestIncome | 1,475 us-gaap_NoninterestIncome | (4,671)us-gaap_NoninterestIncome | 24,918 us-gaap_NoninterestIncome |  | 5,346 us-gaap_NoninterestIncome | 53,568 us-gaap_NoninterestIncome | 58,522 us-gaap_NoninterestIncome | 36,009 us-gaap_NoninterestIncome |  | 142,353 us-gaap_NoninterestIncome |  | 91,662 us-gaap_NoninterestIncome
Direct operating expenses | 26,462 us-gaap_OperatingExpenses |  | 21,406 us-gaap_OperatingExpenses | 22,282 us-gaap_OperatingExpenses | 19,973 us-gaap_OperatingExpenses | 19,670 us-gaap_OperatingExpenses |  | 22,320 us-gaap_OperatingExpenses | 24,430 us-gaap_OperatingExpenses | 20,187 us-gaap_OperatingExpenses | (90,123)us-gaap_OperatingExpenses |  | (86,607)us-gaap_OperatingExpenses |  | (65,633)us-gaap_OperatingExpenses
Other income |  |  |  |  |  |  |  |  |  |  | 1,781 us-gaap_OtherNonoperatingIncome |  | (12,000)us-gaap_OtherNonoperatingIncome |  |
Other expense |  |  |  |  |  |  |  |  |  |  |  |  | (12,000)us-gaap_OtherNoninterestExpense |  |
(Provision for) benefit from income taxes |  |  |  |  |  |  |  |  |  |  | (744)us-gaap_IncomeTaxExpenseBenefit |  | (10,948)us-gaap_IncomeTaxExpenseBenefit |  | (1,291)us-gaap_IncomeTaxExpenseBenefit
Net income | 27,122 us-gaap_NetIncomeLoss |  | 45,097 us-gaap_NetIncomeLoss | 16,017 us-gaap_NetIncomeLoss | 12,333 us-gaap_NetIncomeLoss | 25,135 us-gaap_NetIncomeLoss |  | 21,929 us-gaap_NetIncomeLoss | 65,573 us-gaap_NetIncomeLoss | 60,160 us-gaap_NetIncomeLoss | 100,569 us-gaap_NetIncomeLoss |  | 173,246 us-gaap_NetIncomeLoss |  | 131,769 us-gaap_NetIncomeLoss
Supplemental Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential loans | 3,398,573 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer |  |  |  |  | 2,166,434 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer |  |  |  |  | 3,398,573 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer |  | 2,166,434 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer |  | 2,835,470 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer
Commercial loans | 566,927 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial |  |  |  |  | 432,455 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial |  |  |  |  | 566,927 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial |  | 432,455 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial |  | 313,010 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
Real estate securities | 1,379,230 us-gaap_MarketableSecurities |  |  |  |  | 1,682,861 us-gaap_MarketableSecurities |  |  |  |  | 1,379,230 us-gaap_MarketableSecurities |  | 1,682,861 us-gaap_MarketableSecurities |  | 1,108,753 us-gaap_MarketableSecurities
Mortgage servicing rights | 139,293 us-gaap_ServicingAssetAtFairValueAmount |  |  |  |  | 64,824 us-gaap_ServicingAssetAtFairValueAmount |  |  |  |  | 139,293 us-gaap_ServicingAssetAtFairValueAmount |  | 64,824 us-gaap_ServicingAssetAtFairValueAmount |  | 5,315 us-gaap_ServicingAssetAtFairValueAmount
Total assets | 5,918,966 us-gaap_Assets | [1] |  |  |  | 4,608,528 us-gaap_Assets | [1] |  |  |  | 5,918,966 us-gaap_Assets | [1] | 4,608,528 us-gaap_Assets | [1] | 4,444,098 us-gaap_Assets
Non-cash amortization expense |  |  |  |  |  |  |  |  |  |  | 33,698 us-gaap_AmortizationOfIntangibleAssets |  | 26,442 us-gaap_AmortizationOfIntangibleAssets |  | 24,660 us-gaap_AmortizationOfIntangibleAssets
Operating Segments | Residential Mortgage Banking |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 58,272 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 52,517 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 19,714 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Interest expense |  |  |  |  |  |  |  |  |  |  | (12,776)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | (10,167)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | (3,179)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Net interest income (loss) |  |  |  |  |  |  |  |  |  |  | 45,496 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 42,350 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 16,535 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Non interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage banking activities, net |  |  |  |  |  |  |  |  |  |  | 21,498 rwt_MortgageBankingActivitiesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 79,393 rwt_MortgageBankingActivitiesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 35,438 rwt_MortgageBankingActivitiesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Other market valuation adjustments, net |  |  |  |  |  |  |  |  |  |  | 56 rwt_OtherMarketValuationAdjustments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 38 rwt_OtherMarketValuationAdjustments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 623 rwt_OtherMarketValuationAdjustments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Total non interest income, net |  |  |  |  |  |  |  |  |  |  | 21,554 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 79,431 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 35,793 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Direct operating expenses |  |  |  |  |  |  |  |  |  |  | (37,664)us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | (22,880)us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | (13,214)us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
(Provision for) benefit from income taxes |  |  |  |  |  |  |  |  |  |  | (1,774)us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | (5,947)us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  |
Segment Contribution |  |  |  |  |  |  |  |  |  |  | 27,612 us-gaap_IncomeLossFromContinuingOperations / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 92,954 us-gaap_IncomeLossFromContinuingOperations / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 39,382 us-gaap_IncomeLossFromContinuingOperations / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Supplemental Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential loans | 1,342,519 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  |  |  |  | 404,267 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  |  |  |  | 1,342,519 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 404,267 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 562,658 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Real estate securities | 93,802 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  |  |  |  | 110,505 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  |  |  |  | 93,802 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 110,505 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 10,409 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Mortgage servicing rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,315 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Total assets | 1,468,856 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  |  |  |  | 531,092 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  |  |  |  | 1,468,856 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 531,092 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  | 583,117 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember
Non-cash amortization expense |  |  |  |  |  |  |  |  |  |  | (181)us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialMortgageBankingMember |  |  |  |
Operating Segments | Residential Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 110,433 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 96,399 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 93,266 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Interest expense |  |  |  |  |  |  |  |  |  |  | (11,848)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | (10,067)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | (11,065)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Net interest income (loss) |  |  |  |  |  |  |  |  |  |  | 98,585 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 86,332 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 82,201 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Non interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MSR income (loss) |  |  |  |  |  |  |  |  |  |  | (4,261)rwt_MortgageServicingRightsIncomeIncludingMarketValuationChangesOfMSRs / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 20,309 rwt_MortgageServicingRightsIncomeIncludingMarketValuationChangesOfMSRs / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | (1,391)rwt_MortgageServicingRightsIncomeIncludingMarketValuationChangesOfMSRs / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Other market valuation adjustments, net |  |  |  |  |  |  |  |  |  |  | (9,178)rwt_OtherMarketValuationAdjustments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | (5,134)rwt_OtherMarketValuationAdjustments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | (5,228)rwt_OtherMarketValuationAdjustments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Realized gains, net |  |  |  |  |  |  |  |  |  |  | 13,777 us-gaap_RealizedInvestmentGainsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 24,765 us-gaap_RealizedInvestmentGainsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 32,451 us-gaap_RealizedInvestmentGainsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Total non interest income, net |  |  |  |  |  |  |  |  |  |  | 338 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 39,940 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 25,832 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Direct operating expenses |  |  |  |  |  |  |  |  |  |  | (3,681)us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | (4,035)us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | (5,711)us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Other income |  |  |  |  |  |  |  |  |  |  | 181 us-gaap_OtherNonoperatingIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  |  |  |
(Provision for) benefit from income taxes |  |  |  |  |  |  |  |  |  |  | 1,340 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | (3,027)us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  |
Segment Contribution |  |  |  |  |  |  |  |  |  |  | 96,763 us-gaap_IncomeLossFromContinuingOperations / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 119,210 us-gaap_IncomeLossFromContinuingOperations / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 102,322 us-gaap_IncomeLossFromContinuingOperations / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Supplemental Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential loans | 581,668 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  |  |  |  |  |  |  |  |  | 581,668 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  |  |  |
Real estate securities | 1,285,428 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  |  |  |  | 1,572,356 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  |  |  |  | 1,285,428 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 1,572,356 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 1,098,344 us-gaap_MarketableSecurities / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Mortgage servicing rights | 139,293 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  |  |  |  | 64,824 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  |  |  |  | 139,293 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 64,824 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  |
Total assets | 2,057,256 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  |  |  |  | 1,655,209 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  |  |  |  | 2,057,256 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 1,655,209 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 1,112,948 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Non-cash amortization expense |  |  |  |  |  |  |  |  |  |  | 42,784 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 34,578 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember |  | 30,576 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_ResidentialInvestmentsMember
Operating Segments | Commercial Mortgage Banking and Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 47,567 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 43,420 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 26,048 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Interest expense |  |  |  |  |  |  |  |  |  |  | (15,836)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | (12,677)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | (1,123)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Net interest income (loss) |  |  |  |  |  |  |  |  |  |  | 31,731 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 30,743 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 24,925 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Provision for loan losses |  |  |  |  |  |  |  |  |  |  | (84)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | (3,288)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | (3,477)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Non interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage banking activities, net |  |  |  |  |  |  |  |  |  |  | 13,440 rwt_MortgageBankingActivitiesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 23,102 rwt_MortgageBankingActivitiesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 1,155 rwt_MortgageBankingActivitiesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Realized gains, net |  |  |  |  |  |  |  |  |  |  |  |  | 210 us-gaap_RealizedInvestmentGainsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  |
Total non interest income, net |  |  |  |  |  |  |  |  |  |  | 13,440 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 23,311 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 1,423 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Direct operating expenses |  |  |  |  |  |  |  |  |  |  | (11,324)us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | (9,580)us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | (11,085)us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
(Provision for) benefit from income taxes |  |  |  |  |  |  |  |  |  |  | (234)us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | (3,827)us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | (13)us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Segment Contribution |  |  |  |  |  |  |  |  |  |  | 33,529 us-gaap_IncomeLossFromContinuingOperations / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 37,360 us-gaap_IncomeLossFromContinuingOperations / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 11,505 us-gaap_IncomeLossFromContinuingOperations / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Supplemental Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans | 566,927 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  |  |  |  | 432,455 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  |  |  |  | 566,927 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 432,455 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 313,010 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Total assets | 575,943 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  |  |  |  | 439,139 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  |  |  |  | 575,943 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 439,139 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 320,670 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Non-cash amortization expense |  |  |  |  |  |  |  |  |  |  | (673)us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | (798)us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember |  | 556 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = rwt_CommercialMortgageBankingAndInvestmentsMember
Corporate/Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 25,798 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 33,820 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 92,356 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Interest expense |  |  |  |  |  |  |  |  |  |  | (47,003)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | (48,060)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | (105,338)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Net interest income (loss) |  |  |  |  |  |  |  |  |  |  | (21,205)us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | (14,240)us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | (12,982)us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Provision for loan losses |  |  |  |  |  |  |  |  |  |  | (877)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | (1,449)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | (171)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Non interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other market valuation adjustments, net |  |  |  |  |  |  |  |  |  |  | (1,024)rwt_OtherMarketValuationAdjustments / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | (613)rwt_OtherMarketValuationAdjustments / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 6,144 rwt_OtherMarketValuationAdjustments / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Realized gains, net |  |  |  |  |  |  |  |  |  |  | 1,701 us-gaap_RealizedInvestmentGainsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 284 us-gaap_RealizedInvestmentGainsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 22,470 us-gaap_RealizedInvestmentGainsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Total non interest income, net |  |  |  |  |  |  |  |  |  |  | 677 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | (329)us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 28,614 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Direct operating expenses |  |  |  |  |  |  |  |  |  |  | (37,454)us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | (50,113)us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | (35,623)us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Other income |  |  |  |  |  |  |  |  |  |  | 1,600 us-gaap_OtherNonoperatingIncome / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  |  |  |
Other expense |  |  |  |  |  |  |  |  |  |  |  |  | (12,000)us-gaap_OtherNoninterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  |
(Provision for) benefit from income taxes |  |  |  |  |  |  |  |  |  |  | (76)us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 1,853 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | (1,278)us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Segment Contribution |  |  |  |  |  |  |  |  |  |  | (57,334)us-gaap_IncomeLossFromContinuingOperations / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | (76,278)us-gaap_IncomeLossFromContinuingOperations / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | (21,440)us-gaap_IncomeLossFromContinuingOperations / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Supplemental Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential loans | 1,474,386 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  |  |  |  | 1,762,167 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  |  |  |  | 1,474,386 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 1,762,167 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 2,272,812 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Total assets | 1,816,911 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  |  |  |  | 1,983,088 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  |  |  |  | 1,816,911 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 1,983,088 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 2,427,363 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Non-cash amortization expense |  |  |  |  |  |  |  |  |  |  | $ (8,232)us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | $ (7,338)us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | $ (3,472)us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
[1] | Our consolidated balance sheets include assets of consolidated variable interest entities ("VIEs") that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to the primary beneficiary (Redwood Trust, Inc.). At December 31, 2014 and 2013, assets of consolidated VIEs totaled $1,900,208 and $2,299,576, respectively, and liabilities of consolidated VIEs totaled $1,546,490 and $1,944,911, respectively. See Note 4 for further discussion.

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- Definition The net income attributable to mortgage banking activities. This includes market valuations related to residential and commercial loans, Sequoia IOs, and mortgage banking derivatives, as well as realized gains or losses associated with mortgage loan sales. + References No definition available. + Details
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- Definition Includes income from mortgage banking servicing real estate mortgages, net of subservicing costs, and market valuation changes of MSRs held at fair value. + References No definition available. + Details
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- Definition The aggregate net change in market value for certain assets and liabilities that was included in earnings for the period. This includes changes in market values for assets and liabilities accounted for at fair value and impairments on loans held-for-sale and real estate owned. This excludes valuation adjustments recorded in Mortgage Banking Activities, Net. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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