Debt Disclosure [Abstract] Asset-Backed Securities Issued Secured Borrowings Disclosure [Text Block] This item represents the disclosure related to the asset-backed securities issued under the Sequoia and Acacia securitization entities, and the Residential Resecuritization and Commercial Securitization entities, including their respective components, collateral, and accrued interest payable. Receivables [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Multifamily loans Multifamily Loans [Member] Multifamily Loans [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Multifamily Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Abstract] Schedule IV - Mortgage Loans On Real Estate SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Text Block] Single-family rental loans, held-for-sale at fair value Single-Family Rental Loans, Held-For-Sale At Fair Value [Member] Single-Family Rental Loans, Held-For-Sale At Fair Value [Member] Residential bridge loans held-for-investment Residential Bridge Loans Held-for-investment [Member] Residential Bridge Loans Held-for-investment [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Florida FLORIDA Texas TEXAS California CALIFORNIA Utah UTAH Other states (none greater than 5%) Other State [Member] Other State [Member] Concentration risk percentage Concentration Risk, Percentage Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Incentive Plans Incentive Plans [Member] Incentive Plans [Member] Employee Stock Purchase Plan Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock Restricted Stock [Member] Deferred Stock Units Deferred Stock Units [Member] Deferred Stock Units [Member] Performance Stock Units Performance Shares [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] Unrecognized compensation cost at beginning of period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Equity grants Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount Equity grant forfeitures Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost, Forfeitures Represents the amount of equity grant forfeitures during the period. Equity compensation expense Allocated Share-based Compensation Expense, Including Restructuring Allocated Share-based Compensation Expense, Including Restructuring Unrecognized Compensation Cost at End of Period Accounting Policies [Abstract] Offsetting Asset and Liabilities [Table] Offsetting Asset and Liabilities [Table] Offsetting Asset and Liabilities [Table] Interest Rate Agreement, TBAs, And Futures Interest Rate Agreement, TBAs, And Futures [Member] Interest Rate Agreement, TBAs, And Futures [Member] Interest rate agreements Interest Rate Swap [Member] TBAs TBA Contracts [Member] TBA Contracts [Member] Futures Future [Member] Loan warehouse debt Warehouse Agreement Borrowings [Member] Security repurchase agreements Repurchase Agreements [Member] Offsetting Asset and Liabilities [Line Items] Offsetting Asset and Liabilities [Line Items] Offsetting Asset and Liabilities [Line Items] Gross Amounts of Recognized Assets Derivative Asset, Fair Value, Gross Asset Gross Amounts Offset in Consolidated Balance Sheet Derivative Asset, Fair Value, Gross Liability Derivative assets Derivative Asset Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments Derivative, Collateral, Obligation to Return Securities Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received Derivative, Collateral, Obligation to Return Cash Net Amount Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election Gross Amounts of Recognized Liabilities - Derivatives Derivative Liability, Fair Value, Gross Liability Gross Amounts of Recognized Liabilities - Other Securities Sold under Agreements to Repurchase, Gross Gross Amounts of Recognized Liabilities Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Gross Gross Amounts Offset in Consolidated Balance Sheet - Derivatives Derivative Liability, Fair Value, Gross Asset Gross Amounts Offset in Consolidated Balance Sheet - Other Securities Sold under Agreements to Repurchase, Asset Gross Amounts Offset in Consolidated Balance Sheet Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Asset Net Amounts of Liabilities Presented in Consolidated Balance Sheet - Derivatives Derivative Liability Net Amounts of Liabilities Presented in Consolidated Balance Sheet - Other Securities Sold under Agreements to Repurchase Net Amounts of Liabilities Presented in Consolidated Balance Sheet Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments - Derivatives Derivative, Collateral, Right to Reclaim Securities Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments - Other Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Securities Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged - Derivatives Derivative, Collateral, Right to Reclaim Cash Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged - Other Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Cash Net Amount - Derivatives Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election Net Amount - Other Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral Net Amount Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Amount Offset Against Collateral Long-Term Debt Long-term Debt [Text Block] Equity [Abstract] Changes to Accumulated Other Comprehensive Income (Loss) by Component Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Reclassifications out of Accumulated Other Comprehensive Income (Loss) Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Basic and Diluted Earnings (Loss) Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Guarantee Obligations Guarantee Obligations [Member] Residential Residential Mortgage Backed Securities [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Other Income Other Income [Member] Mortgage Banking And Investment Activities Mortgage Banking And Investment Activities [Member] Mortgage Banking And Investment Activities [Member] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] Financing Receivables, Equal to Greater than 90 Days Past Due Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] Residential Loans Residential Loans at Fair Value [Member] Residential Loans at Fair Value [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Sequoia Entities Sequoia Securitization Entities [Member] Sequoia Securitization Entities [Member] Loss Contingencies by Name of Plaintiff [Axis] Loss Contingencies by Name of Plaintiff [Axis] Loss Contingencies by Name of Plaintiff [Axis] Loss Contingencies by Name of Plaintiff [Domain] Loss Contingencies by Name of Plaintiff [Domain] Loss Contingencies by Name of Plaintiff [Domain] FHLB Seattle Federal Home Loan Bank of Seattle [Member] Schwab Charles Schwab Corporation [Member] Charles Schwab Corporation [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Morgan Stanley and Company Morgan Stanley And Company [Member] Morgan Stanley And Company [Member] Sequoia Residential Funding Sequoia Residential Funding [Member] Sequoia Residential Funding [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of non-cancelable leases Operating Leases, Number Of Leases, Noncancelable Operating Leases, Number Of Leases, Noncancelable Lease expiration year Lease Expiration Year The date upon which a lease or a group of leases is set to expire. Future lease commitments with expiration date Operating Leases, Future Minimum Payments Due Operating lease expense Operating Leases, Rent Expense, Net Unamortized leasehold improvements Leasehold Improvements, Gross Leasehold amortization expense (less than) Amortization of Leasehold Improvement Amortization of Leasehold Improvement Commitment to fund partnership Commitment To Fund Partnership Commitment To Fund Partnership Commitment to fund partnership, funded amount Commitment To Fund Partnership, Funded Amount Commitment To Fund Partnership, Funded Amount Loan held-for-investment, amount Loan Held-for-investment, Amount Loan Held-for-investment, Amount Long term commitment, additional liability Long Term Commitment, Additional Liability Long Term Commitment, Additional Liability Original principal balance of loans sold subject to risk sharing agreement Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement, Original Principal Balance Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement, Original Principal Balance Potential future payments on risk sharing agreements Potential Future Payments Potential Future Payments Fee income from risk sharing agreement Fee Income, Risk Sharing Agreement Fee Income, Risk Sharing Agreement Market valuation changes in fair value of guarantee asset Market Valuation Changes In Fair Value Of Guarantee Asset Market Valuation Changes In Fair Value Of Guarantee Asset Principal amount outstanding on loans securitized Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement FICO credit score Financing Receivable, Credit Score, FICO, Weighted Average The weighted average FICO score for borrowers at the time loans were originated. Loan to value ratio Financing Receivable, Loan To Value Ratio Financing Receivable, Loan To Value Ratio Loans past due Financing Receivable, Recorded Investment, Past Due Loans held as assets amount in foreclosure Fair Value, Option, Loans Held As Assets, Aggregate Amount In Foreclosure Fair Value, Option, Loans Held As Assets, Aggregate Amount In Foreclosure Guarantee obligations Guaranty Liabilities Guarantee obligation, credit reserve Guarantee Obligation, Credit Reserve Guarantee Obligation, Credit Reserve SPE, assets Special Purpose Entities, Assets Special Purpose Entities, Assets SPE, liabilities Special Purpose Entities, Liabilities Special Purpose Entities, Liabilities Residential loan and MSR repurchase reserve Mortgage Loan On Real Estate, Repurchase Reserve Mortgage Loan On Real Estate, Repurchase Reserve Residential loans repurchase requests Mortgage Loans On Real Estate, Repurchase Requests Mortgage Loans On Real Estate, Repurchase Requests Residential loans, number of loans repurchased Mortgage Loans On Real Estate, Number Of Loans Repurchased Mortgage Loans On Real Estate, Number Of Loans Repurchased Residential loans repurchase provision (reversal) Mortgage Loans On Real Estate, Repurchase Provision Mortgage Loans On Real Estate, Repurchase Provision Residential loans repurchased during period Mortgage Loans On Real Estate, Loans Repurchased Mortgage Loans On Real Estate, Loans Repurchased Statutory interest rate per annum Percentage Interest Plaintiff The percentage at which the plaintiff would like to collect interest on their initial investment. Original principal amount of securities Debt Instrument, Face Amount Debt instrument principal payment amount Repayments of Bank Debt Debt instrument interest payment amount Debt Instrument Unpaid Interest Paid By Cash Debt Instrument Unpaid Interest Paid By Cash Number of other named defendants along with SRF Loss Contingency, Number of Defendants Principal balance of securities Debt Instrument Aggregate Principal Amount Debt Instrument Aggregate Principal Amount Debt instrument interest amount Debt Instrument Accrued Interest Debt Instrument Accrued Interest Number of mortgage pass through certificates issued Number Of Mortgage Pass Through Certificates Issued Number Of Mortgage Pass Through Certificates Issued Aggregate amount of loss contingency reserves Estimated Litigation Liability Equity Compensation Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Principles of Consolidation Variable Interest Entity Disclosure [Text Block] Investments, All Other Investments [Abstract] Summary of Other Investments Summary Of Other Investments [Table Text Block] Summary Of Other Investments [Table Text Block] Components of Servicer Advance Investments Schedule of Servicing Assets at Fair Value [Table Text Block] Income from Mortgage Servicing Rights, Net Schedule Of Components Of Mortgage Backed Securities Interest Income [Table Text Block] Schedule Of Components Of Mortgage Backed Securities Interest Income [Table Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Statement of Comprehensive Income [Abstract] Net income Net Income (Loss) Attributable to Parent Other comprehensive (loss) income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Net unrealized (loss) gain on available-for-sale securities Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Reclassification of unrealized gain on available-for-sale securities to net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Net unrealized gain on interest rate agreements Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Reclassification of unrealized loss on interest rate agreements to net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Total other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax Total Comprehensive Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets Assets, Fair Value Disclosure [Abstract] Residential loans Receivables, Fair Value Disclosure Business purpose residential loans Business Purpose Loans, Fair Value Disclosure Business Purpose Loans, Fair Value Disclosure Multifamily loans Multifamily Loans, Fair Value Disclosure Multifamily Loans, Fair Value Disclosure Trading securities Debt Securities, Trading, and Equity Securities, FV-NI Available-for-sale securities Debt Securities, Available-for-sale Servicer advance investments Servicer Advance Investments Servicer Advance Investments MSR Fair Value Servicing Asset at Fair Value, Amount Excess MSRs Excess Mortgage Servicing Rights, IOs Excess Mortgage Servicing Rights, IOs Derivative assets Pledged collateral Pledged Assets Separately Reported, Other Assets Pledged as Collateral, at Fair Value FHLBC stock Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Guarantee asset Guarantees Asset, Fair Value Disclosure Guarantees Asset, Fair Value Disclosure Liabilities Liabilities, Fair Value Disclosure [Abstract] Derivative liabilities ABS issued Debt Instrument, Fair Value Disclosure Investments, Debt and Equity Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Option Indexed to Issuer's Equity [Axis] Option Indexed to Issuer's Equity [Axis] Option Indexed to Issuer's Equity, Type [Domain] Option Indexed to Issuer's Equity, Type [Domain] Sales Put Option [Member] Calls Call Option [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Gross realized gains Debt Securities, Available-for-sale, Realized Gain Gross realized losses Debt Securities, Available-for-sale, Realized Loss Total Realized Gains on Sales and Calls of AFS Securities, net Available-for-sale Securities, Gross Realized Gain (Loss) On Sales And Calls Available-for-sale Securities, Gross Realized Gain (Loss) On Sales And Calls Arizona ARIZONA Georgia GEORGIA Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate Schedule [Table] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate Schedule [Table] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Investment Fair Value Changes, Net Investment Activities [Member] Investment Activities [Member] Residential Mortgage Banking Activities, Net Residential Mortgage Banking Activities [Member] Residential Mortgage Banking Activities [Member] Commercial Mortgage Banking Activities, Net Commercial Mortgage Banking Activities [Member] Commercial Mortgage Banking Activities [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Residential loans at fair value Sequoia securities Risk management derivatives, net Price Risk Derivative [Member] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] Changes in fair value of assets Increase (Decrease) in Fair Value Adjustments on Assets Increase (Decrease) in Fair Value Adjustments on Assets Changes in fair value of risk management derivatives Increase (Decrease) in Fair Value of Price Risk Fair Value Hedging Instruments Other income, net Other Income Mortgage Banking Activities, Net Mortgage Banking Activities, Net 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. Investment [Table] Investment [Table] Residential Loans Servicer Advance Financing [Member] Servicer Advance Financing [Member] Investment [Line Items] Investment [Line Items] Principal and interest advances Servicing Assets At Fair Value, Principal And Interest Advances Servicing Assets At Fair Value, Principal And Interest Advances Escrow advances (taxes and insurance advances) Servicing Assets At Fair Value, Escrow Advances Servicing Assets At Fair Value, Escrow Advances Corporate advances Servicing Assets At Fair Value, Corporate Advances Servicing Assets At Fair Value, Corporate Advances Total Servicer Advance Receivables Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Data - Unaudited Quarterly Financial Information [Text Block] Short-Term Debt Short-term Debt [Text Block] Quarterly Financial Data Quarterly Financial Information [Table Text Block] Fair Values of Real Estate Securities by Collateral Type and Entity Fair Value And Investments In Debt And Marketable Equity Securities And Certain Trading Assets Disclosures [Table Text Block] Tabular disclosure of fair value and investments in debt and marketable equity securities. Trading Securities by Collateral Type Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Available for Sale Securities by Collateral Type Debt Securities, Available-for-sale [Table Text Block] Components of Carrying Value (Which Equals Fair Value) of Residential Available for Sale Securities Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities Unamortized Discount and Designated Credit Reserves on Available for Sale Securities [Table Text Block] Tabular disclosure of the changes in the unamortized discount and designated credit reserves on Available for Sale securities for the period. Components of Carrying Value of Available for Sale Securities in Unrealized Loss Position Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] Summary of Significant Valuation Assumptions for Available for Sale Securities Schedule Of Significant Valuation Assumptions For Available For Sale Securities [Table Text Block] Tabular disclosure of the significant valuation assumptions used by management for available for sale securities. Activity of Credit Component of Other-than-Temporary Impairments Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block] Gross Realized Gains and Losses on Sales and Calls of Available for Sale Securities Realized Gain (Loss) on Investments [Table Text Block] Income Statement [Abstract] Operating results: Operating Income (Loss) [Abstract] Interest income Interest and Dividend Income, Operating Interest expense Interest Expense Net Interest Income Interest Income (Expense), Net Non-interest income Noninterest Income Operating expenses Operating Expenses Net Income Per share data: Earnings Per Share [Abstract] Net income - basic (in dollars per share) Earnings Per Share, Basic Net Income - diluted (in dollars per share) Earnings Per Share, Diluted Regular dividends declared per common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Derivative Instruments and Hedging Activities Disclosure [Abstract] Aggregate Fair Value and Notional Amount of Derivative Financial Instruments Schedule of Derivative Instruments [Table Text Block] Impact on Interest Expense of Interest Rate Agreements Accounted for as Cash Flow Hedges Derivative Instruments, Gain (Loss) [Table Text Block] Carrying Value of ABS Issued by Consolidated Securitization Entities Sponsored, along with Other Selected Information Schedule of Asset Backed Securities [Table Text Block] Tabular disclosure of information pertaining to asset backed securities, including but not limited to identification of components, terms, features, and other information necessary to a fair presentation. Schedule of Interest Payable On Asset-Backed Securities Issued Schedule Of Interest Payable On Asset-Backed Securities Issued [Table Text Block] Schedule Of Interest Payable On Asset-Backed Securities Issued [Table Text Block] Summary of Carrying Value Components of Collateral for ABS Issued and Outstanding Schedule Of Collateral For Asset Backed Securities [Table Text Block] Tabular disclosure of the collateral for asset backed securities. Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Trading securities Trading Securities1 [Member] Trading Securities [Member] AFS Securities Available-for-sale Securities [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Principal balance of loans transferred Principal Amount Of Loans Securitized During Period Principal Amount Of Loans Securitized During Period Securities retained, at fair value Securities Retained At Fair Value During Period Securities Retained At Fair Value During Period MSRs recognized Servicing Asset at Fair Value, Additions Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Shell Company Entity Shell Company Number of partnerships consolidated Number Of Partnerships Consolidated Number Of Partnerships Consolidated Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] VIE, ownership interest rate Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Net income attributable to Redwood Less: Dividends and undistributed earnings allocated to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Net income allocated to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Basic weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Basic earnings per common share (in dollars per share) Less: Dividends and undistributed earnings allocated to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted Add back: Interest expense on convertible notes for the period, net of tax Interest on Convertible Debt, Net of Tax Net income allocated to common shareholders Net Income (Loss) Available to Common Stockholders, Diluted Net effect of dilutive equity awards (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Net effect of assumed convertible notes conversion to common shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Diluted weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Diluted earnings per common share (in dollars per share) Statement of Cash Flows [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash and Cash Equivalents Segment Reporting [Abstract] Financial Information by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule Of Corporate And Other Schedule Of Corporate And Other [Table Text Block] Schedule Of Corporate And Other [Table Text Block] Supplemental Balance Sheet Supplemental Balance Sheet [Table Text Block] Supplemental Balance Sheet [Table Text Block] Real estate securities Real Estate Investment [Member] Senior IO Securities Senior Securities [Member] Senior Securities [Member] Mezzanine Real Estate Securities, Prime Mezzanine [Member] Real Estate Securities, Prime Mezzanine [Member] Subordinate Securities Subordinate Securities [Member] Subordinate Securities [Member] Excess MSRs Excess Mortgage Servicing Rights [Member] Excess Mortgage Servicing Rights [Member] Assets Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Collateral [Axis] Collateral [Axis] Collateral [Domain] Collateral [Domain] Sequoia Choice Sequoia Choice Securitization Entities [Member] Sequoia Choice Securitization Entities [Member] Freddie Mac SLST Freddie Mac SLST [Member] Freddie Mac SLST [Member] Freddie Mac K-Series Freddie Mac K-Series Securitization Entities [Member] Freddie Mac K-Series Securitization Entities [Member] Investment Securities Class [Axis] Investment Securities Class [Axis] Investment Securities Class [Domain] Investment Securities Class [Domain] Sequoia Securities Sequoia Securities [Member] Sequoia Securities [Member] Servicer advance financing Residential loans Residential Loans [Member] Residential Loans [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Convertible senior notes due 2018 Convertible Senior Notes Due 2018 [Member] Convertible Senior Notes Due 2018 [Member] Exchangeable senior notes due 2019 Exchangeable Senior Notes Due 2019 [Member] Exchangeable Senior Notes Due 2019 [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Convertible notes Convertible Debt [Member] Short-term Debt [Line Items] Short-term Debt [Line Items] Loan pledged as collateral Loans Pledged as Collateral AFS securities pledged as collateral Debt Securities, Available-for-sale, Restricted Trading securities pledged as collateral Debt Securities, Trading, Restricted Collateral amounts Debt Instrument, Collateral Amount Average balance of short-term debt Short-term Debt, Average Outstanding Amount Accrued interest payable on short-term debt Interest Payable, Current Unamortized capitalized commitment costs Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums Convertible notes Convertible Notes Payable Debt instrument interest rate Debt Instrument, Interest Rate, Stated Percentage Deferred debt issuance costs Debt Issuance Costs, Net Repurchased debt instrument, face amount Debt Instrument, Repurchased Face Amount Gain (loss) on extinguishment of debt Gain (Loss) on Extinguishment of Debt Convertible notes Convertible Notes Payable, Current Committed line of credit Line of Credit Facility, Current Borrowing Capacity Collateral at fair value Financial Instruments, Owned and Pledged as Collateral, at Fair Value Committed line of credit with financial institutions, outstanding Long-term Line of Credit Stockholders Equity Note [Table] Stockholders Equity Note [Table] Stockholders Equity Note [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock Common Stock [Member] ATM Offerings At The Market Offerings [Member] At The Market Offerings [Member] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Convertible debt securities Convertible Debt Securities [Member] Equity awards Stock Compensation Plan [Member] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Share Repurchase Plan, February 2016 Share Repurchase Plan, February 2016 [Member] Share Repurchase Plan, February 2016 [Member] Share Repurchase Plan, February 2018 Share Repurchase Program, February 2018 [Member] Share Repurchase Program, February 2018 [Member] Stockholders Equity Note [Line Items] Stockholders Equity Note [Line Items] Stockholders Equity Note [Line Items] Issuance of common stock (in shares) Stock Issued During Period, Shares, New Issues Net proceeds from issuance of common stock Proceeds from Issuance of Common Stock Aggregate value of common stock issuable Stock Issuance Program, Authorized Amount Stock Issuance Program, Authorized Amount Outstanding for future offerings, amount Stock Issuance Program, Shares Outstanding, Value Stock Issuance Program, Shares Outstanding, Value Securities excluded in the calculation of diluted earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Stock repurchase program, authorized amount Stock Repurchase Program, Authorized Amount Share repurchased during period (in shares) Stock Repurchased During Period, Shares Share repurchases Stock Repurchased During Period, Value Stock repurchase program, remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Increase in authorized repurchase amount Stock Repurchase Program, Increase In Authorized Repurchase Amount Stock Repurchase Program, Increase In Authorized Repurchase Amount Future Lease Commitments Lessee, Operating Lease, Disclosure [Table Text Block] Mortgage servicing rights Mortgage Servicing Rights [Member] Mortgage Servicing Rights [Member] Servicing Asset at Fair Value, Amount [Roll Forward] Servicing Asset at Fair Value, Amount [Roll Forward] Balance at beginning of period Additions Sales Servicing Asset at Fair Value, Disposals Changes in fair value due to: Changes in assumptions Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions Changes in fair value due to: Other changes Servicing Asset at Fair Value, Other Changes in Fair Value Balance at End of Period Servicing income Contractually Specified Servicing Fees, Amount Cost of sub-servicer Mortgage Servicing Expense Mortgage Servicing Expense Net servicing fee income Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset Market valuation changes of MSRs Total Net Change In Market Value Related to Mortgage Servicing Rights Total net change in market value related to mortgage servicing rights. Market valuation changes of associated derivatives Market Valuation Changes In Associated Derivatives Market Valuation Changes In Associated Derivatives MSR reversal of provision for repurchases Provision For Mortgage Servicing Rights Repurchases Provision For Mortgage Servicing Rights Repurchases MSR Income (Loss), Net Mortgage Servicing Rights Income Including Market Valuation Changes of MSRs Includes income from mortgage banking servicing real estate mortgages, net of subservicing costs, and market valuation changes of MSRs held at fair value. Other Investments Investments and Other Noncurrent Assets [Text Block] Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Securitization Activity Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood Schedule of Gain (Loss) on Securitizations or Asset-backed Financing Arrangements of Financial Assets Accounted for as Sale [Table Text Block] Cash Flows Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood Cash Flows between Transferee and Transferor Current Period [Table Text Block] Cash Flows between a transferor and a transferee attributable to transferred assets related to either a securitization 0r asset-backed financing arrangement in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets). MSR Assumptions Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood Schedule of Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Table Text Block] Unconsolidated Variable Interest Entity's Sponsored by Redwood Summary Qualitative and Quantitative Information, Transferor's Continuing Involvement [Table Text Block] Key Assumptions and Sensitivity Analysis for Assets Retained from Unconsolidated Variable Interest Entity's Sponsored by Redwood Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] Loan Transfers Accounted for as Secured Borrowings Schedule of Secured Borrowings [Table Text Block] Tabular disclosure of loans accounted for as secured borrowings. Other Income and Expenses [Abstract] Components of Operating Expenses Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Income Tax Disclosure [Abstract] Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Federal Internal Revenue Service (IRS) [Member] State and Local Jurisdiction State and Local Jurisdiction [Member] Income Taxes [Line Items] Income Taxes [Line Items] Income Taxes [Line Items] Estimated operating loss carry forwards Estimated Operating Loss Carryforwards Estimated Operating Loss Carryforwards NOL carry forwards, expiring year Operating Loss Carryforwards, Expiration Year Operating Loss Carryforwards, Expiration Year NOL carry forwards Operating Loss Carryforwards Percentage prohibited transaction tax for not meeting the requirements of statutory relief Prohibited Transaction Tax Rate Prohibited Transaction Tax Rate Margin receivable Margin Deposit Assets FHLBC stock Federal Home Loan Bank Stock Investment receivable Accrued Investment Income Receivable Fixed assets and leasehold improvements Property, Plant and Equipment, Net REO Real Estate Acquired Through Foreclosure Other Other Assets, Miscellaneous Total Other Assets Other Assets Fixed assets basis Property, Plant and Equipment, Gross Fixed assets, accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Proceeds from new transfers Cash Flows Between Transferor and Transferee, Proceeds from New Transfers MSR fees received Cash Flows Between Transferor and Transferee, Servicing Fees Funding of compensating interest, net Cash Flows Between Transferor and Transferee, Servicing Fee Advances Cash flows received on retained securities Cash Flows Between Transferor and Transferee, Beneficial Interest Summary of Other Assets Schedule of Other Assets [Table Text Block] Summary of Accrued Expenses and Other Liabilities Accrued Expenses and Other Liabilities [Table Text Block] Accrued Expenses and Other Liabilities [Table Text Block] Equity Stockholders' Equity Note Disclosure [Text Block] Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Business purpose residential loans Business Purpose Loans [Member] Business Purpose Loans [Member] Servicer advance investments Servicer Advance Investments [Member] Servicer Advance Investments [Member] MSRs Guarantee Asset Asset Value Guarantees [Member] Asset Value Guarantees [Member] Derivatives Derivative Financial Instruments, Assets [Member] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] ABS issued Asset-backed Securities [Member] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Assets Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Acquisitions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Principal paydowns Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Calls, Maturities, Paydowns Principal paydowns, including calls and maturities, that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. Gains (losses) in net income, net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Unrealized losses in OCI, net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Other settlements, net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Ending Balance Liabilities Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Acquisitions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales Principal paydowns Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Paydowns Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Paydowns Gains (losses) in net income, net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Unrealized losses in OCI, net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) Other settlements, net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Ending Balance Employee Stock Purchase Plan (ESPP) Activity [Roll Forward] Employee Stock Purchase Plan (ESPP) Activity [Roll Forward] Employee Stock Purchase Plan (ESPP) Activity [Roll Forward] Balance at beginning of period Employee Stock Ownership Plan (ESOP), Repurchase Obligation Amount Employee purchases Stock Issued During Period, Value, Employee Stock Purchase Plan Cost of common stock issued Employee Stock Ownership Plan (ESOP), Compensation Expense Balance at End of Period Financial Instruments Owned and Pledged as Collateral [Table] Financial Instruments Owned and Pledged as Collateral [Table] Legacy Sequoia Legacy Sequoia Securitization Entities [Member] Legacy Sequoia Securitization Entities [Member] Restricted cash Cash and Cash Equivalents [Domain] Accrued interest receivable Interest Receivable [Member] Interest Receivable [Member] REO Other Real Estate Owned [Member] Other Real Estate Owned [Member] Financial Instruments Owned and Pledged as Collateral [Line Items] Financial Instruments Owned and Pledged as Collateral [Line Items] Collateral for ABS Issued Collateral for Asset Backed Securities Issued The carrying value of collateral as of the balance sheet date for the asset-backed securities issued. Investment Holdings [Table] Investment Holdings [Table] Subordinate Real Estate Securities, Prime Subordinate [Member] Real Estate Securities, Prime Subordinate [Member] Investment Holdings [Line Items] Investment Holdings [Line Items] Leases [Abstract] 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2020 Operating Leases, Future Minimum Payments, Due in Two Years 2021 Operating Leases, Future Minimum Payments, Due in Three Years 2022 and thereafter Operating Leases, Future Minimum Payments, Due In Four Years And Thereafter Operating Leases, Future Minimum Payments, Due In Four Years And Thereafter Total Lease Commitments Business Purpose Residential Loans Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Net Unrealized Gains on Available-for-Sale Securities Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Balance at beginning of period Stockholders' Equity Attributable to Parent Other comprehensive income (loss) before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Amounts reclassified from other accumulated comprehensive income Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Net current-period other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Balance at End of Period Other comprehensive income (loss). before reclassification adjustments, tax benefit (provision) Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Contract Interest Rate Contract [Member] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Investment fair value changes, net Unrealized Gain (Loss) on Investments Realized gains, net Realized Investment Gains (Losses) Provision for income taxes Income Tax Expense (Benefit) Interest expense Net income before provision for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Other than temporary impairments Other than Temporary Impairment Losses, Investments Other than temporary impairment losses, income statement Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net Accumulated other comprehensive income, other-than-temporary impairments Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table] Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table] Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table] Fair Value, Measurements, Nonrecurring Fair Value, Measurements, Nonrecurring [Member] Residential loans, at lower of cost or fair value Residential Loans at Lower of Cost or Fair Value [Member] Residential Loans at Lower of Cost or Fair Value [Member] Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] Loans, at lower of cost or fair value Loans Held-for-sale, Fair Value Disclosure Other assets Other Assets, Fair Value Disclosure Gain (loss) on assets measured at fair value on a non-recurring basis Fair Value, Option, Changes in Fair Value, Gain (Loss) Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Legacy Sequoia Servicing Investment Excess Servicing Entities [Member] Excess Servicing Entities [Member] Total Consolidated VIEs Residential loans, held-for-investment Residential Loans Held for Investment [Member] Residential Loans Held for Investment [Member] Multifamily loans, held-for-investment Multifamily Loans Held for Investment [Member] Multifamily Loans Held for Investment [Member] Other investments Other Investments [Member] Restricted cash Restricted Cash [Member] Restricted Cash [Member] REO Short-term debt Short-term Debt [Member] Accrued interest payable Interest Payable [Member] Interest Payable [Member] Accrued expenses and other liabilities Accrued Liabilities [Member] Asset-backed securities issued Assets Variable Interest Entity, Consolidated, Carrying Amount, Assets Liabilities Variable Interest Entity, Consolidated, Carrying Amount, Liabilities Number of VIEs Number of Variable Interest Entities, Acquired and Consolidated Number of Variable Interest Entities, Acquired and Consolidated Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Residential Loans Held For Sale Residential Loans Held For Sale [Member] Residential Loans Held For Sale [Member] Residential Loans Held For Investment Residential Loans Held For Investment At Fair Value, Including Loans At Historical Cost [Member] Residential Loans Held For Investment At Fair Value, Including Loans At Historical Cost [Member] Statement [Line Items] Statement [Line Items] ASSETS Assets [Abstract] Loan market valuation adjustment Loans and Leases Receivable, Net Amount Real estate securities, at fair value Marketable Securities Other investments Other Investments Accrued interest receivable Interest Receivable Other assets Total Assets Assets LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Liabilities Liabilities [Abstract] Short-term debt Short-term Debt Accrued interest payable Interest Payable Accrued expenses and other liabilities Accrued Liabilities Asset-backed securities issued, at fair value Secured Debt Long-term debt, net Long-term Debt Total liabilities Liabilities Commitments and Contingencies (see Note 16) Commitments and Contingencies Equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Common stock, par value $0.01 per share, 180,000,000 shares authorized; 84,884,344 and 76,599,972 issued and outstanding Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Cumulative earnings Retained Earnings (Accumulated Deficit) Cumulative distributions to stockholders Cumulative Dividends Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total Liabilities and Equity Liabilities and Equity Fixed compensation expense Fixed Compensation Expense Fixed Compensation Expense Variable compensation expense Variable Compensation Expense Variable Compensation Expense Equity compensation expense Allocated Share-based Compensation Expense Total compensation expense Labor and Related Expense Systems and consulting Communications and Information Technology Loan acquisition costs Loan Acquisition Costs Loan Acquisition Costs Office costs General and Administrative Expense Accounting and legal Professional Fees Corporate costs Other General Expense Other operating expenses Other Cost and Expense, Operating Operating expenses before restructuring charges Operating Expenses, Excluding Restructuring Charges Operating Expenses, Excluding Restructuring Charges Restructuring charges Restructuring Charges Total Operating Expenses Upfront costs associated with hiring new executive officer Salary and Wage, Officer, Excluding Cost of Good and Service Sold Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Fixed Compensation Expense Employee Severance, Fixed Compensation [Member] Employee Severance, Fixed Compensation [Member] Equity Compensation Expense Employee Severance, Equity Compensation [Member] Employee Severance, Equity Compensation [Member] Contract Termination Costs Contract Termination [Member] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Line of Credit Line of Credit [Member] Convertible notes, net Convertible Notes Payable [Member] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Within 30 days Maturity Less than 30 Days [Member] 31 to 90 days Maturity 30 to 90 Days [Member] Over 90 days Maturity Greater than 90 Days [Member] Held-for sale residential loans Residential Loan Warehouse [Member] Residential Loan Warehouse [Member] Real estate securities Real Estate Securities Repo [Member] Real Estate Securities Repo [Member] Single-family rental loan warehouse Single-Family Rental Loan Warehouse Facilities [Member] Single-Family Rental Loan Warehouse Facilities [Member] Residential bridge loan warehouse Residential Bridge Loan Warehouse Facilities [Member] Residential Bridge Loan Warehouse Facilities [Member] Mortgage Banking Activities Mortgage Banking Activities Disclosure [Text Block] The entire disclosure for Mortgage Banking Activities, Net. Mortgage banking activities include the components of the contribution to net income from our residential and commercial loan business activities. This includes valuation changes related to residential and commercial loans and the derivatives used to manage certain risks associated with the residential and commercial loans we own or plan to acquire and securitize, valuation changes of retained Sequoia IO securities, and gains from mortgage loan sales. Summary of Classifications and Carrying Value of Loans Carrying Value Of Loans [Table Text Block] Tabular disclosure of the net carrying value for loans by entity as of the balance sheet date. Geographic Concentration of Loans Recorded on Consolidated Balance Sheet Schedule Of Percentage Of Principal Loan By Geographical Area [Table Text Block] Schedule Of Percentage Of Principal Loan By Geographical Area. Loan Product Type and Accompanying Loan Characteristics of Loans Schedule of Loans Receivable [Table Text Block] Schedule of Loans Receivable. Credit Reserve Available For Sale Securities Unamortized Discounts Premiums [Abstract] [Roll Forward] Available For Sale Securities Unamortized Discounts Premiums [Abstract] [Roll Forward] Beginning balance Available For Sale Securities Credit Reserve Balance of credit reserve on available-for-sale securities. Amortization of net discount Available For Sale Securities Credit Reserve, Amortization of net (Discount) Premium Changes to credit reserve on available-for-sale securities due to the amortization of net discount Realized credit losses Available For Sale Securities Credit Reserve, Realized Credit Gains Losses Changes to the credit reserve on available-for-sale securities due to realized credit losses. Acquisitions Available For Sale Securities Credit Reserve, Acquisitions Changes to the credit reserve on available-for-sale securities due to security acquisitions. Sales, calls, other Available For Sale Securities Credit Reserve, Sales, Calls, Other Changes to the credit reserve on available-for-sale securities due to sales, calls, and other items. Impairments Available for Sale Securities Credit Reserve, Impairments Changes to the credit reserve on available-for-sale securities due to impairments. Transfers to (release of) credit reserves, net Available For Sale Securities Credit Reserve, Transfers to (Release of) Credit Reserves Transfers to or releases of the credit reserve on available-for-sale securities. Ending Balance Unamortized Discount, Net Available For Sale Securities Credit Reserve [Roll Forward] Available For Sale Securities Credit Reserve [Roll Forward] Beginning balance Available For Sale Securities Unamortized Discounts Premiums Balance of net unamortized discount on available-for-sale securities. Amortization of net discount Available For Sale Securities Unamortized Discounts Premiums, Amortization of net (discount) premium Changes to the net unamortized discount on available-for-sale securities due to the amortization of net discount. Realized credit losses Available For Sale Securities Unamortized Discounts Premiums, Realized Credit Gains Losses Changes to the net unamortized discount on available-for-sale securities due to realized credit losses. Acquisitions Available For Sale Securities Unamortized Discounts Premiums, Acquisitions Changes to the net unamortized discount on available-for-sale securities due to security acquisitions. Sales, calls, other Available For Sale Securities Unamortized Discounts Premiums, Sales, Calls, Other Changes to the net unamortized discount on available-for-sale securities due to sales, calls, and other items. Impairments Available For Sale Securities Unamortized Discounts Premiums, Impairments Changes to the net unamortized discount on available-for-sale securities due to impairments. Transfers to (release of) credit reserves, net Available For Sale Securities Unamortized Discounts Premiums, Transfers to (Release of) Credit Reserves Transfers to or releases of the credit reserve on available-for-sale securities. Ending Balance SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] Balance at beginning of period SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate Additions during period: Mortgage Loans On Real Estate, Additions [Abstract] Mortgage Loans On Real Estate, Additions [Abstract] Originations/acquisitions SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, New Mortgage Loan Net discount accretion Mortgage Loans On Real Estate, Net Discount Accretion Mortgage Loans On Real Estate, Net Discount Accretion Deductions during period: Mortgage Loans On Real Estate, Deductions [Abstract] Mortgage Loans On Real Estate, Deductions [Abstract] Sales SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Cost of Mortgage Sold Principal repayments SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Collections of Principal Reversal of provision for loan losses Mortgage Loans on Real Estate, Reversal Of Provision For Loan Losses Mortgage Loans on Real Estate, Reversal Of Provision For Loan Losses Transfers to REO Mortgage Loans on Real Estate, Transfers To Real Estate Other Mortgage Loans on Real Estate, Transfers To Real Estate Other Deconsolidation adjustments Mortgage Loans on Real Estate, Deconsolidation Adjustment Mortgage Loans on Real Estate, Deconsolidation Adjustment Changes in fair value, net Mortgage Loans on Real Estate, Unrealized Gain (Loss) On Change In Fair Value Mortgage Loans on Real Estate, Unrealized Gain (Loss) On Change In Fair Value Balance at end of period Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] Balance at beginning of period Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held Initial credit impairments Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment Subsequent credit impairments Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses Securities sold, or expected to sell Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold Securities with no outstanding principal at period end Other Than Temporary Impairment Credit Losses Recognized In Earnings Matured Called Written Down This item represents reductions in the amount of cumulative losses recognized in earnings for other than temporary impairments (OTTI) for which a portion of the impairment had been recognized in other comprehensive income (a component of shareholders' equity) due to securities maturing, being called or fully written down. Balance at End of Period Derivative [Table] Derivative [Table] Residential and Commercial Loans Residential and Commercial Loans [Member] Residential and Commercial Loans [Member] Loan purchase commitments Loan Purchase Commitments [Member] Mortgage Banking Activities, Net Mortgage Banking Activities [Member] Mortgage Banking Activities [Member] Derivative Liabilities Derivative Financial Instruments, Liabilities [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Cash Flow Hedging Cash Flow Hedging [Member] Derivative [Line Items] Derivative [Line Items] Notional Amount Derivative, Notional Amount Valuation adjustments on derivatives Derivative, Gain (Loss) on Derivative, Net Stockholders' equity attributable to parent Number of counterparties Derivative, Number Of Counterparties Derivative, Number Of Counterparties Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Fair Value Measurements Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value Option Accounting Policy For Electing Fair Value Option For Financial Instruments [Policy Text Block] Disclosure of accounting policy for electing the fair value option for financial instruments. Real Estate Loans Finance, Loans and Leases Receivable, Policy [Policy Text Block] Real Estate Securities, at Fair Value Marketable Securities, Policy [Policy Text Block] Other Investments Other Investments, Policy [Policy Text Block] Other Investments, Policy [Policy Text Block] MSRs Mortgage Servicing Rights [Policy Text Block] Disclosure of accounting policy for mortgage servicing rights. Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Accrued Interest Receivable Accrued Interest Receivable [Policy Text Block] Disclosure of accounting policy for accrued interest receivable. Derivative Financial Instruments Derivatives, Policy [Policy Text Block] Deferred Tax Assets and Liabilities Income Tax, Policy [Policy Text Block] Other Assets and Other Liabilities Other Assets And Other Liabilities Policy [Policy Text Block] Other Assets And Other Liabilities Policy Textblock Short-Term Debt Short Term Debt [Policy Text Block] Disclosure of accounting policy for short-term debt. Accrued Interest Payable Accrued Liabilities [Policy Text Block] Disclosure of accounting policy for accrued interest payable. Asset-Backed Securities Issued Asset Backed Securities [Policy Text Block] Disclosure of accounting policy for costs incurred to obtain or issue asset-backed securities, the effects of refinancing, method of amortizing deferred financing costs and original issue discount, and classifications of asset-backed securities on the balance sheet. Long-Term Debt Debt, Policy [Policy Text Block] Equity Stockholders' Equity, Policy [Policy Text Block] Incentive Plans Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Taxes Regulatory Income Taxes, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Balance Sheet Netting Balance Sheet Netting [Policy Text Block] Balance Sheet Netting Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Carrying Value Reported Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Residential Loans Residential Mortgage [Member] Residential Loans Held For Investment at Fair Value Residential Loans Held For Investment At Fair Value [Member] Residential Loans Held For Investment At Fair Value [Member] Credit facilities Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Loans, held-for-sale Loans, held-for-investment Loans Receivable, Fair Value Disclosure Participation in loan warehouse facility Lines of Credit, Fair Value Disclosure Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Restricted cash Restricted Cash and Cash Equivalents, Fair Value Disclosure Restricted Cash and Cash Equivalents, Fair Value Disclosure Accrued interest receivable Interest Receivable, Fair Value Disclosure Interest Receivable, Fair Value Disclosure Margin receivable Accounts Receivable, Fair Value Disclosure Liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Short-term debt facilities Short-term Debt, Fair Value Accrued interest payable Interest Payable, Fair Value Disclosure Interest Payable, Fair Value Disclosure Margin payable Margin Payable, Fair Value Disclosure Margin Payable, Fair Value Disclosure Guarantee obligation Guarantees, Fair Value Disclosure ABS issued at fair value FHLBC long-term borrowings Federal Home Loan Bank Borrowings, Fair Value Disclosure Convertible notes, net Convertible Debt, Fair Value Disclosures Trust preferred securities and subordinated notes, net Trust Preferred Securities And Subordinated Notes, Net, Fair Value Disclosure Trust Preferred Securities And Subordinated Notes, Net, Fair Value Disclosure Other Income, Net Mortgage Servicing Rights Income (Loss), Including Risk Management Derivatives [Member] Mortgage Servicing Rights Income (Loss), Including Risk Management Derivatives [Member] Single-family rental loans held-for-sale, at fair value Single-Family Residential Loans Held-for-sale at Fair Value [Member] Single-Family Residential Loans Held-for-sale at Fair Value [Member] Loan purchase commitments Commercial loans, at fair value Commercial Loans at Fair Value [Member] Commercial Loans at Fair Value [Member] Sequoia securities Investments In Consolidated Variable Interest Entity [Member] Investments In Consolidated Variable Interest Entity [Member] Commercial loans held-for-sale Commercial Loans Held For Investment [Member] Commercial Loans Held For Investment [Member] Risk-sharing investments Risk Sharing Investments [Member] Risk Sharing Investments [Member] Impairments on AFS securities Impaired Securities [Member] Impaired Securities [Member] Mortgage servicing rights income (loss), net Mortgage Servicing Rights Income (Loss), Net Includes income (loss) from mortgage banking servicing real estate mortgages, net of subservicing costs, and market valuation changes of MSRs held at fair value. Total Market Valuation Gains (Losses), Net Market Valuation Adjustments, Net 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, as well as the credit portion of other-than-temporary impairments on securities available for sale, impairments on loans held-for-sale and real estate owned. Interest-only, senior and subordinate securities, classified as trading Interest Only Strip And Senior Securities [Member] Interest Only Strip And Senior Securities [Member] Subordinate securities, classified as AFS Senior and Subordinated Securities [Member] Senior and Subordinated Securities [Member] On-balance sheet assets, at fair value: Securities Maximum loss exposure Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Principal balance of loans outstanding Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding Principal balance of loans 30 days delinquent Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together, Delinquent Amount at End of Period Concentration Risk [Table] Concentration Risk [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Redwood Parent Company [Member] Washington WASHINGTON New Jersey NEW JERSEY New York NEW YORK Concentration Risk [Line Items] Concentration Risk [Line Items] Schedule of Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Table] Schedule of Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Table] Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] Prepayment rates Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities, Prepayment Speed Discount rates Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities, Discount Rate Credit loss assumptions Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities, Expected Credit Losses Investment Fair Value Changes Investments Fair Value Changes, Net [Text Block] Investments Fair Value Changes, Net [Text Block] Net interest expense on cash flows hedges Interest Expense Cash Flow Hedge Amount of interest expense recognized in earnings on cash flow hedge. Realized net losses reclassified from other comprehensive income Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion Total interest expense Loan forward sale commitments Forward Sales Commitments [Member] Forward Sales Commitments [Member] Other assets - Guarantee asset Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Residential loans at Redwood Residential Loans Held At Redwood [Member] Residential Loans Held At Redwood [Member] Residential loans at consolidated Sequoia entities Residential Loans At Consolidated Sequoia Entities [Member] Residential Loans At Consolidated Sequoia Entities [Member] Net gain (loss) attributable to Level 3 asset Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included In Earnings, Excluding Sold, Matured, Called, Or Written Down Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included In Earnings, Excluding Sold, Matured, Called, Or Written Down Net gain (loss) attributable to Level 3 liability Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included In Earnings, Excluding Sold, Matured, Called, Or Written Down Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included In Earnings, Excluding Sold, Matured, Called, Or Written Down SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Axis] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Axis] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Domain] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Domain] Hybrid ARM Loans Hybrid ARM Loan [Member] Hybrid ARM Loan [Member] Fixed Loans Fixed Loans [Member] Fixed Loans [Member] ARM Loans ARM Loans [Member] ARM Loans [Member] Loan Balance Range [Axis] Loan Balance Range [Axis] Loan Balance Range [Axis] Loan Balance Range [Domain] Loan Balance Range [Domain] [Domain] for Loan Balance Range [Axis] $0 to $250 Range One [Member] Range One [Member] $251 to $500 Range Two [Member] Range Two [Member] $501 to $750 Range Three [Member] Range Three [Member] $751 to $1,000 Range Four [Member] Range Four [Member] Over $1,000 Range Five [Member] Range Five [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum