Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Mortgage Banking Activities, Net 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. Debt Disclosure [Abstract] Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] 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] Components of Net Deferred Tax Assets Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Provision for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Reconciliation of Statutory Tax Rate to Effective Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Mortgage Loans on Real Estate Schedule [Table] 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 Residential Loans at Fair Value [Member] Residential Loans at Fair Value [Member] Sequoia securities Sequoia Securitization Entities [Member] Sequoia Securitization Entities [Member] Risk management derivatives, net Price Risk Derivative [Member] Mortgage Loans on Real Estate [Line Items] 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 (expense), net Revenue, Other Financial Services 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. Current Provision for Income Taxes Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Total Current Provision for Income Taxes Current Income Tax Expense (Benefit) Deferred Provision for Income Taxes Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Total Deferred Provision for (Benefit from) Income Taxes Deferred Income Tax Expense (Benefit) Total Provision for Income Taxes Income Tax Expense (Benefit) Mortgage Loans on Real Estate [Abstract] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities Axis [Domain] Consolidated Entities Axis [Domain] [Domain] for Consolidated Entities Axis [Axis] Redwood Parent Company [Member] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Legacy Sequoia Legacy Sequoia Securitization Entities [Member] Legacy Sequoia Securitization Entities [Member] Sequoia Choice Sequoia Choice Securitization Entities [Member] Sequoia Choice Securitization Entities [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, held-for-investment Residential Loans Held for Investment [Member] Residential Loans Held for Investment [Member] Residential Loans Held For Sale Residential Loans Held For Sale [Member] Residential Loans Held For Sale [Member] Mortgage Loans on Real Estate, Loan Type [Axis] Mortgage Loans on Real Estate, Loan Type [Axis] Mortgage Loans on Real Estate, Loan Type [Domain] 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] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Number of Loans Mortgage Loans on Real Estate, Number of Loans Interest Rate Mortgage Loans on Real Estate, Interest Rate Carrying Amount Mortgage Loans on Real Estate, Carrying Amount of Mortgages Principal Amount Subject to Delinquent Principal or Interest Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans Short-Term Debt Short-term Debt [Text Block] Receivables [Abstract] Concentration Risk [Table] Concentration Risk [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] California CALIFORNIA Texas TEXAS Washington WASHINGTON Florida FLORIDA Georgia GEORGIA New York NEW YORK Other states (none greater than 5%) Other State [Member] Other State [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Concentration risk percentage Concentration Risk, Percentage 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] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Equity Compensation Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Accounting Policies [Abstract] Significant Accounting Policies [Table] Significant Accounting Policies [Table] Significant Accounting Policies [Table] Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Percentage of losses assumed on pool of loans sold Loss Contingency, Percentage Of Losses Assumed On Pool Of Loans Sold Loss Contingency, Percentage Of Losses Assumed On Pool Of Loans Sold Risk-sharing arrangement term Risk-Sharing Arrangement Term Risk-Sharing Arrangement Term SPE, assets Special Purpose Entities, Assets Special Purpose Entities, Assets SPE, liabilities Special Purpose Entities, Liabilities Special Purpose Entities, Liabilities Incentive Plan, awards vesting period (in years) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Incentive Plan, mandatory holding period before awards vest Share-Based Compensation Arrangement By Share-Based Payment Award, Award Holding Period Share-Based Compensation Arrangement By Share-Based Payment Award, Award Holding Period Employee Stock Purchase Plan, percentage of common stock fair value that employees can purchase Employee Stock Purchase Plan, Minimum Percentage of Common Stock Fair Value Defined to Purchase Shares By Eligible Participants Employee Stock Purchase Plan, Minimum Percentage of Common Stock Fair Value Defined to Purchase Shares By Eligible Participants Employees maximum 401(k) contribution Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Employer matching contributions Defined Contribution Plan, Employer Discretionary Contribution Amount Future lease commitments with expiration date Operating Leases, Future Minimum Payments Due Fair Value Disclosures [Abstract] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] 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] Loan Balance, minimum Mortgage Loan On Real Estate Minimum Amount Mortgage Loan On Real Estate Minimum Amount Loan Balance, maximum Mortgage Loan On Real Estate Maximum Amount Mortgage Loan On Real Estate Maximum Amount Total Principal Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement 30-89 Days DQ Mortgage Loans On Real Estate Principal Amount Of Delinquent Loans For Thirty To Ninety Days Amount of principal due on loans that have been delinquent thirty to eighty-nine days as of the balance sheet date. 90 Days DQ Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] 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 Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] 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] Financial Instruments Owned and Pledged as Collateral by Type [Axis] Financial Instruments Owned and Pledged as Collateral by Type [Axis] Financial Instruments Owned and Pledged as Collateral, Type [Domain] Financial Instruments Owned and Pledged as Collateral, Type [Domain] 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] Short-term Debt [Line Items] Short-term Debt [Line Items] Short-term debt Short-term Debt 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] Organization Nature of Operations [Text Block] Federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State statutory rate, net of Federal tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Differences in taxable (loss) income from GAAP income Effective Income Tax Rate Reconciliation, Deduction, Percent Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Dividends paid deduction Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent Federal statutory rate change Effective Income Tax Rate Reconciliation, Tax Cuts And Jobs Act Of 2017, Percent Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) in income tax rate and transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017. Effective Tax Rate Effective Income Tax Rate Reconciliation, Percent Investments, Debt and Equity Securities [Abstract] Investment Holdings [Table] Investment Holdings [Table] Senior IO Securities Senior Securities [Member] Senior Securities [Member] Re-REMIC Resecuritization of Real Estate Mortgage Investment Securities [Member] Resecuritization of Real Estate Mortgage Investment Securities [Member] Subordinate Securities Subordinate Securities [Member] Subordinate Securities [Member] Investment Securities Class [Axis] Investment Securities Class [Axis] Investment Securities Class [Domain] Investment Securities Class [Domain] Mezzanine Real Estate Securities, Prime Mezzanine [Member] Real Estate Securities, Prime Mezzanine [Member] Subordinate Real Estate Securities, Prime Subordinate [Member] Real Estate Securities, Prime Subordinate [Member] Investment Holdings [Line Items] Investment Holdings [Line Items] Available-for-sale securities Available-for-sale Securities Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] 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 Derivative [Table] Derivative [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Contract Interest Rate Contract [Member] TBAs TBA Contracts [Member] TBA Contracts [Member] Futures Future [Member] Residential and Commercial Loans Residential and Commercial Loans [Member] Residential and Commercial Loans [Member] Interest rate agreements Interest Rate Swap [Member] Loan purchase commitments Loan Purchase Commitments [Member] Mortgage Banking Activities, Net Mortgage Banking Activities [Member] Mortgage Banking Activities [Member] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] 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] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] 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] Derivative [Line Items] Derivative [Line Items] Notional Amount Derivative, Notional Amount Valuation adjustments on derivatives Derivative, Gain (Loss) on Derivative, Net Net unrealized gain (loss) on interest rate agreements Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Stockholders' equity attributable to parent Stockholders' Equity Attributable to Parent Number of counterparties Derivative, Number Of Counterparties Derivative, Number Of Counterparties Transfers and Servicing [Abstract] Schedule of Servicing Assets at Fair Value [Table] Schedule of Servicing Assets at Fair Value [Table] Mortgage servicing rights Mortgage Servicing Rights [Member] Mortgage Servicing Rights [Member] Conforming Loans Conforming Loan [Member] Conforming Loan [Member] Jumbo Loans Jumbo Loan [Member] Jumbo Loan [Member] Servicing Assets at Fair Value [Line Items] Servicing Assets at Fair Value [Line Items] MSR Fair Value Servicing Asset at Fair Value, Amount Associated Principal Servicing Asset Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Net Unrealized Gains on Available-for-Sale Securities Accumulated Net Investment Gain (Loss) 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 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 Schedule of Fair Value of MSRs and Aggregate Principal Amounts of Associated Loans Schedule Of Mortgage Servicing Rights and Their Associated Principal Amounts [Table Text Block] Schedule Of Mortgage Servicing Rights and Their Associated Principal Amounts [Table Text Block] Activity for Residential First-Lien Mortgage Servicing Rights Schedule of Servicing Assets at Fair Value [Table Text Block] Details of Retention and Purchase of MSRs Schedule Of Mortgage Servicing Rights M S R Table [Text Block] Schedule Of Mortgage Servicing Rights M S R 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] 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] Call Option Call Option [Member] Put Option Put Option [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Gross realized gains Available-for-sale Securities, Gross Realized Gains Gross realized losses Available-for-sale Securities, Gross Realized Losses 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 Income Statement [Abstract] Interest Income Interest and Dividend Income, Operating [Abstract] Residential loans Interest and Fee Income, Loans, Consumer, Real Estate Commercial loans Interest and Fee Income, Loans, Commercial, Real Estate Real estate securities Interest Income, Securities, Mortgage Backed Other interest income Interest Income, Other Total interest income Interest and Dividend Income, Operating Interest Expense Interest Expense [Abstract] Short-term debt Interest Expense, Short-term Borrowings Asset-backed securities issued Interest Expense, Beneficial Interests Issued by Consolidated Variable Interest Entities Long-term debt Interest Expense, Long-term Debt Total interest expense Interest Expense Net Interest Income Interest Income (Expense), Net Reversal of provision for loan losses Provision for Loan, Lease, and Other Losses Net Interest Income after Provision Interest Income (Expense), after Provision for Loan Loss Non-interest Income Noninterest Income [Abstract] Mortgage banking activities, net 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. Investment fair value changes, net Unrealized Gain (Loss) on Investments Other income Other Income Realized gains, net Realized Investment Gains (Losses) Total non-interest income, net Noninterest Income Operating expenses Operating Expenses Net Income before Provision for Income Taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest (Provision for) benefit from income taxes Net Income Net Income (Loss) Attributable to Parent Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Regular dividends declared per common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Basic weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Equity Compensation Plans Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] Restricted Stock Outstanding Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Deferred Stock Units Activity Schedule Of Share Based Compensation Deferred Stock Units Activity [Table Text Block] Tabular disclosure of the number and weighted-average grant date fair value for deferred stock units that were outstanding at the beginning and end of the year, and the number of deferred stock units that were granted, vested, or forfeited during the year. Summary of Activity Related to ESPP Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] Summary of Activity Related to Executive Deferred Compensation Plan Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table Text Block] Trading Securities Trading Securities [Member] AFS Securities Available-for-sale Securities [Member] 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 Residential Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Trading securities Trading Securities Principles of Consolidation Variable Interest Entity Disclosure [Text Block] Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Data - Unaudited Quarterly Financial Information [Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Corporate/ Other Corporate, Non-Segment [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Investment Portfolio Residential Investments [Member] Residential Investments [Member] Residential Mortgage Banking Residential Mortgage Banking [Member] Residential Mortgage Banking [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Interest income Interest expense Reversal of provision for loan losses Non-interest income MSR income (loss), net Direct operating expenses Benefit from income taxes Non-cash amortization income (expense), net Amortization Hedging allocations Gain (Loss) on Hedging Activity Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table] Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Executive Deferred Compensation Plan Executive Deferred Compensation Plan [Member] Executive Deferred Compensation Plan [Member] Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent [Roll Forward] Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent [Roll Forward] Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent [Roll Forward] Balance at beginning of period Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent New deferrals Deferred Compensation Arrangement with Individual, New Deferrals Deferred Compensation Arrangement with Individual, New Deferrals Accrued interest Deferred Compensation Arrangement with Individual, Accrued Interest Deferred Compensation Arrangement with Individual, Accrued Interest Withdrawals Deferred Compensation Arrangement with Individual, Withdrawals Deferred Compensation Arrangement with Individual, Withdrawals Balance at End of Period 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] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Residential Loans Residential Mortgage [Member] Commercial Loans Commercial Loan [Member] Residential Loans 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] 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] Commercial Loans At Lower Of Cost Or Market Commercial Loans At Lower Of Cost Or Market [Member] Commercial Loans At Lower Of Cost Or Market [Member] 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-sale, Fair Value Disclosure Loans, held-for-investment Loans Receivable, 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 Derivative assets Derivative Asset REO Other Assets, Fair Value Disclosure Margin receivable Accounts Receivable, Fair Value Disclosure FHLBC stock Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Guarantee asset Guarantees Asset, Fair Value Disclosure Guarantees Asset, Fair Value Disclosure Pledged collateral Pledged Assets Separately Reported, Other Assets Pledged as Collateral, at Fair Value 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 Derivative liabilities Derivative Liability ABS issued at fair value, net Debt Instrument, Fair Value Disclosure 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 Number of operating segments Number of Operating Segments Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Legacy Sequoia Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Asset-backed securities issued Asset-backed Securities [Member] Investment Secondary Categorization [Axis] Investment Secondary Categorization [Axis] Investments by Secondary Categorization [Domain] Investments by Secondary Categorization [Domain] Contractual maturities of over five years Maturity over Five Years [Member] Maturity over Five Years [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Contractual maturities of ABS (in years) Long Term Marketable Securities Maturities Term Long Term Marketable Securities Maturities Term Amortization of deferred ABS issuance costs Amortization of Debt Issuance Costs Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Long-Term Debt Long-term Debt [Text Block] 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] Investments Fair Value Changes Schedule Of Investments Fair Value Changes, Net [Table Text Block] Schedule Of Investments Fair Value Changes, Net [Table Text Block] Accrued compensation Employee-related Liabilities Guarantee obligations Guaranty Liabilities Deferred tax liabilities Deferred Income Tax Liabilities, Net Residential loan and MSR repurchase reserve Mortgage Loan On Real Estate, Repurchase Reserve Mortgage Loan On Real Estate, Repurchase Reserve Legal reserve Estimated Litigation Liability Accrued operating expenses Accrued Expenses Accrued Expenses Current accounts payable Accounts Payable, Current Margin payable Margin Payable Margin Payable Restructuring liabilities Restructuring Reserve Other Other Liabilities, Miscellaneous Other Liabilities, Miscellaneous Total Other Liabilities Other Liabilities Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table] Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table] MSRs Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items] Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items] Fair value Transferor's Interests in Transferred Financial Assets, Fair Value Expected life (in years) Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Weighted Average Life Prepayment speed assumption (annual CPR) Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Prepayment Speed, Percent Decrease in fair value from: Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Adverse Change In Prepayment Speed [Abstract] Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Adverse Change In Prepayment Speed [Abstract] 10% adverse change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed 25% adverse change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Prepayment Speed Impact of adverse change in prepayment speed Sensitivity Analysis Of Fair Value, Transferor's Interests In Transferred Financial Assets, Impact Of Adverse Change In Prepayment Speed, Percent Sensitivity Analysis Of Fair Value, Transferor's Interests In Transferred Financial Assets, Impact Of Adverse Change In Prepayment Speed, Percent Discount rate assumption Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Discount Rate, Percent Decrease in fair value from: Sensitivity Analysis of Fair Value of Interests that Continue to be Held by Transferor, Servicing Assets or Liabilities [Abstract] Sensitivity Analysis of Fair Value of Interests that Continue to be Held by Transferor, Servicing Assets or Liabilities [Abstract] 100 basis point increase Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Discount Rate 200 basis point increase Sensitivity Analysis of Fair Value of Interests Continued to Be Held by Transferor Servicing Assets or Liabilities Impact of Two Hundred Basis Point Adverse Change in Discount Rate The hypothetical financial impact of a 200 basis point adverse change of the discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. Impact on discount rate of basis point increase Sensitivity Analysis Of Fair Value, Transferor's Interests In Transferred Financial Assets, Impact On Discount Rate Of Basis Point Increase, Percent Sensitivity Analysis Of Fair Value, Transferor's Interests In Transferred Financial Assets, Impact On Discount Rate Of Basis Point Increase, Percent Credit loss assumption Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact Other than 10 or 20 Percent Adverse Change in Expected Credit Loss, Percent Decrease in fair value from: Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Adverse Change In Expected Credit Losses [Abstract] Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Adverse Change In Expected Credit Losses [Abstract] 10% higher losses Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Expected Credit Losses 25% higher losses Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact Other than 10 or 20 Percent Adverse Change in Expected Credit Loss Impact of adverse change in expected credit losses (as a percent) Sensitivity Analysis Of Fair Value, Transferor's Interests In Transferred Financial Assets, Impact Of Adverse Change In Expected Credit Losses, Percent Sensitivity Analysis Of Fair Value, Transferor's Interests In Transferred Financial Assets, Impact Of Adverse Change In Expected Credit Losses, Percent Other Assets and Liabilities Other Assets And Other Liabilities Disclosure [Text Block] Other Assets And Other Liabilities Disclosure Federal Home Loan Bank Branch [Axis] Federal Home Loan Bank Branch [Axis] Federal Home Loan Bank Branch [Domain] Federal Home Loan Bank Branch [Domain] FHLB Chicago Federal Home Loan Bank of Chicago [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Subsidiaries Subsidiaries [Member] 2024 Long-term Debt, Maturities, Repayments of Principal in Year Eight Long-term Debt, Maturities, Repayments of Principal in Year Eight 2025 Long-term Debt, Maturities, Repayments of Principal in Year Nine Long-term Debt, Maturities, Repayments of Principal in Year Nine 2026 Long-term Debt, Maturities, Repayments of Principal in Year Ten Long-term Debt, Maturities, Repayments of Principal in Year Ten Total FHLBC Borrowings Long-term Debt Residential Residential Mortgage Backed Securities [Member] 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 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 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 Trading Securities [Table Text Block] Available for Sale Securities by Collateral Type Available-for-sale Securities [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 Available-for-sale Securities, Continuous 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] 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] Held-for sale residential loans Fixed Rate Residential Mortgage Fixed Rate Residential Mortgage [Member] Hybrid Residential Mortgages Hybrid Or ARM Loans [Member] Hybrid Or ARM Loans [Member] Mortgage Loans on Real Estate, Description, Loan Category [Axis] Mortgage Loans on Real Estate, Description, Loan Category [Axis] Mortgage Loans on Real Estate, Loan Category [Domain] Mortgage Loans on Real Estate, Loan Category [Domain] Originated Between 2013 and 2017 Originated Between Twenty Thirteen And Twenty Seventeen [Member] Originated Between Twenty Thirteen And Twenty Seventeen [Member] Originated In 2012 And Prior Years Originated During Twenty Twelve And Prior Years [Member] Originated During Twenty Twelve And Prior Years [Member] Mortgage servicing rights Servicing Asset at Amortized Cost Loan market valuation adjustment Loans and Leases Receivable, Net Amount Number of loans past due Financing Receivable, Number Of Loans Past Due Financing Receivable, Number Of Loans Past Due Loans held as assets, 90 days or more past due Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due Number of loans in foreclosure Financing Receivable, Number Of Loans In Foreclosure Financing Receivable, Number Of Loans In Foreclosure Principal value Principal Balance of Loans Acquired During Period Principal Balance of Loans Acquired During Period Principal balance of loans sold during period Principal Balance of Loans Sold During Period Principal Balance of Loans Sold During Period Valuation adjustments Fair Value, Option, Changes in Fair Value, Gain (Loss) Loan pledged as collateral Loans Pledged as Collateral Transfers from loans held-for-sale to loans held-for-investment Transfer of Loans Held-for-sale to Portfolio Loans Transfers from loans held-for-investment to loans held-for-sale Transfer of Portfolio Loans and Leases to Held-for-sale Residential mortgage loans securing FHLB advances Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged Percentage of loan portfolio Percentage Of Loan Portfolio Percentage Of Loan Portfolio 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 Percentage of loans with fixed interest rate Loans Receivable, Percentage Bearing Fixed Interest, Percentage Rate Loans Receivable, Percentage Bearing Fixed Interest, Percentage Rate Weighted average rate on loans Financing Receivables, Weighted Average Interest Rate Financing Receivables, Weighted Average Interest Rate 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 Valuation adjustments Mortgage Loans on Real Estate, Period Increase (Decrease) Prime Real Estate Securities, Prime [Member] Real Estate Securities, Prime [Member] Prepayment rates Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Prepayment Rates This item represents a significant valuation assumption on prepayment rates, represented as a percentage, which was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired. Projected losses Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Default Rate 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] 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 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 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 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 Subsequent Event [Table] Subsequent Event [Table] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Share Repurchase Plan, February 2018 Share Repurchase Program, February 2018 [Member] Share Repurchase Program, February 2018 [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Increase in authorized repurchase amount Stock Repurchase Program, Increase In Authorized Repurchase Amount Stock Repurchase Program, Increase In Authorized Repurchase Amount Stock repurchase program, authorized amount Stock Repurchase Program, Authorized Amount 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] 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 Servicing income Contractually Specified Servicing Fees, Amount Cost of sub-servicer Mortgage Servicing Expense Mortgage Servicing Expense Net servicing fee income Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets 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. Total Consolidated VIEs Restricted cash Restricted Cash [Member] Restricted Cash [Member] Accrued interest receivable Interest Receivable [Member] Interest Receivable [Member] REO Real Estate Investment [Member] Accrued interest payable Interest Payable [Member] Interest Payable [Member] Accrued expenses and other liabilities Accrued Liabilities [Member] 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 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] Guarantee Asset Asset Value Guarantees [Member] Asset Value Guarantees [Member] Derivatives Derivative Financial Instruments, Assets [Member] Commercial Secured Borrowings Commercial Secured Loan [Member] Commercial Secured Loan [Member] ABS issued 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 Reconciliations, 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 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: Assets, Fair Value Disclosure [Abstract] Securities Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets 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 Earnings Per Share [Abstract] 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) 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) Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Common Stock Common Stock [Member] Additional Paid-In Capital Additional Paid-in Capital [Member] Accumulated Other Comprehensive Income AOCI Attributable to Parent [Member] Cumulative Earnings Retained Earnings [Member] Cumulative Distributions to Stockholders Accumulated Distributions in Excess of Net Income [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Previously Reported Scenario, Previously Reported [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance (in shares) Shares, Issued Cumulative effect adjustment - adoption of ASU 2014-13 Cumulative Effect of New Accounting Principle in Period of Adoption Net income Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Dividend reinvestment & stock purchase plans Stock Issued During Period, Value, Dividend Reinvestment and Stock Purchase Plan Value of stock issued as a result of dividend reinvestment and stock purchase plan recorded above par value. Dividend reinvestment & stock purchase plans (in shares) Stock Issued During Period, Shares, Dividend Reinvestment and Stock Purchase Plan Stock Issued During Period, Shares, Dividend Reinvestment and Stock Purchase Plan Employee stock purchase and incentive plans Stock Issued During Period, Value, Employee Stock Purchase Plans And Other Incentive Plans Stock Issued During Period, Value, Employee Stock Purchase Plans And Other Incentive Plans Employee stock purchase and incentive plans (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans And Other Incentive Plans Stock Issued During Period, Shares, Employee Stock Purchase Plans And Other Incentive Plans Non-cash equity award compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Share repurchases Stock Repurchased During Period, Value Share repurchases (in shares) Stock Repurchased During Period, Shares Common dividends declared Dividends, Common Stock Ending balance (in shares) Trading Carrying Value Total Real Estate Securities Marketable Securities Deferred Tax Assets Deferred Tax Assets, Gross [Abstract] Net operating loss carryforward – state Deferred Tax Assets, Operating Loss Carryforwards, State and Local Net capital loss carryforward – state Deferred Tax Assets, Capital Loss Carryforwards, State and Local Deferred Tax Assets, Capital Loss Carryforwards, State and Local Net operating loss carryforward – federal Deferred Tax Assets, Operating Loss Carryforwards, Domestic Net capital loss carryforward – federal Deferred Tax Assets, Capital Loss Carryforwards, Domestic Deferred Tax Assets, Capital Loss Carryforwards, Domestic Real estate assets Deferred Tax Assets, Real Estate Assets Deferred Tax Assets, Real Estate Assets Interest rate agreements Deferred Tax Assets, Interest Rate Agreements Deferred Tax Assets, Interest Rate Agreements Allowances and accruals Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals Other Deferred Tax Assets, Other Total Deferred Tax Assets Deferred Tax Assets, Gross Deferred Tax Liabilities Deferred Tax Liabilities, Gross [Abstract] Real estate assets Deferred Tax Liabilities, Real Estate Assets Deferred Tax Liabilities, Real Estate Assets Mortgage Servicing Rights Deferred Tax Liabilities, Mortgage Servicing Rights Interest rate agreements Deferred Tax Liabilities, Derivatives Tax effect of unrealized gains – OCI Deferred Tax Liabilities, Other Comprehensive Income Total Deferred Tax Liabilities Deferred Tax Liabilities, Gross Valuation allowance Deferred Tax Assets, Valuation Allowance Total Deferred Tax Asset (Liability), net of Valuation Allowance Deferred Tax Liabilities, Net Segment Information Segment Reporting Disclosure [Text Block] 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. Operating Expenses Other Income and Other Expense Disclosure [Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] MSR Income (Loss), Net Mortgage Servicing Rights Income (Loss), Including Risk Management Derivatives [Member] Mortgage Servicing Rights Income (Loss), Including Risk Management Derivatives [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] Trading securities Trading Securities1 [Member] Trading Securities [Member] Valuation adjustments on 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] 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] 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. Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table] Residential Senior Securities Residential Senior Securities [Member] Residential Senior Securities [Member] Residential Subordinate Securities Residential Subordinate Securities [Member] Residential Subordinate Securities [Member] Residential loans Residential Loans [Member] Residential Loans [Member] Real estate securities Real Estate Securities [Member] Real Estate Securities [Member] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] Fair value option elected aggregate carrying amount, asset Fair Value, Option, Assets, Aggregate Carrying Amount During Period Fair Value, Option, Assets, Aggregate Carrying Amount During Period Dealer marks of securities Percentage of Dealer Quotes Received on Securities Percentage of Third-party Dealer Quotes Received on Securities. Percentage of carrying value for which dealer quotes were received on securities Percentage of Carrying Value for Which Dealer Quotes Were Received on Securities Percentage of Carrying Value for Which Dealer Quotes Were Received on Securities Percentage difference of internal valuation than dealer marks Percentage Difference Of Internal Valuation Than Dealer Marks Percentage Difference Of Internal Valuation Than Dealer Marks Residential loan warehouse Real estate securities repo Number of Facilities Number of Facilities Number of Facilities Outstanding Balance Limit Line of Credit Facility, Maximum Borrowing Capacity Weighted Average Interest Rate Short-term Debt, Weighted Average Interest Rate Weighted Average Days Until Maturity Debt Instrument Average, Maturity Term Debt Instrument Average, Maturity Term Real estate securities Assets Taxes Income Tax Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Net unrealized gain (loss) on available-for-sale securities Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of 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 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 income (loss) Total Comprehensive Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Statement of Cash Flows [Abstract] Cash Flows From Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Amortization of premiums, discounts, and debt issuance costs, net Accretion (Amortization) of Discounts and Premiums, Investments Depreciation and amortization of non-financial assets Depreciation, Depletion and Amortization, Nonproduction Purchases of held-for-sale loans Payments to Purchase Loans Held-for-sale Proceeds from sales of held-for-sale loans Proceeds from Sale of Loans Held-for-sale Principal payments on held-for-sale loans Proceeds from Collection of Loans Held-for-sale Net settlements of derivatives Payments For Proceeds From Derivative Instrument Operating Activities The net cash outflow or inflow from derivative instruments during the period, which are classified as operating activities. Reversal of provision for loan losses Non-cash equity award compensation expense Share-based Compensation Market valuation adjustments Realized gains, net Gain (Loss) on Sale of Investments Net change in: Increase (Decrease) in Operating Capital [Abstract] Accrued interest receivable and other assets Increase (Decrease) in Operating Assets Accrued interest payable, deferred tax liabilities, and accrued expenses and other liabilities Increase (Decrease) in Operating Liabilities Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Cash Flows From Investing Activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of loans held-for-investment Payments to Acquire Loans and Leases Held-for-investment Proceeds from sales of loans held-for-investment Proceeds from Sale of Loans Held-for-investment Principal payments on loans held-for-investment Proceeds from Principal Repayments on Loans and Leases Held-for-investment Purchases of real estate securities Payments to Acquire Marketable Securities Proceeds from sales of real estate securities Proceeds from Sale and Maturity of Marketable Securities Principal payments on real estate securities Proceeds from Principal Repayments on Securities The cash inflow from repayments of the balance excluding interest (principal) on real estate securities. Purchase of mortgage servicing rights Payments to Acquire Mortgage Servicing Rights (MSR) Proceeds from sales of mortgage servicing rights Proceeds from Sale of Mortgage Servicing Rights (MSR) Net change in restricted cash Increase (Decrease) in Restricted Cash Net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Cash Flows From Financing Activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from borrowings on short-term debt Proceeds from Short-term Debt Repayments on short-term debt Repayments of Short-term Debt Proceeds from issuance of asset-backed securities Proceeds from Issuance of Secured Debt Repayments on asset-backed securities issued Repayments of Secured Debt Deferred debt issuance costs Payments of Debt Issuance Costs Proceeds from issuance of long-term debt Proceeds from Issuance of Long-term Debt Repayments on long-term debt Repayments of Long-term Debt Net settlements of derivatives Payments for (Proceeds from) Derivative Instrument, Financing Activities Net proceeds from issuance of common stock Proceeds from Issuance of Common Stock Net payments on repurchase of common stock Payments for Repurchase of Common Stock Taxes paid on equity award distributions Payments Related to Tax Withholding for Share-based Compensation Dividends paid Payments of Dividends Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Net decrease in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Supplemental Cash Flow Information: Supplemental Cash Flow Information [Abstract] Cash paid during the period for: Cash Paid During Period [Abstract] Cash Paid During Period [Abstract] Interest Interest Paid Taxes Income Taxes Paid Supplemental Noncash Information: Noncash Investing and Financing Items [Abstract]