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Residential Loans - Loan Product Type and Accompanying Loan Characteristics of Residential Loans (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 1,486 2,013
Total Principal $ 1,034,434,000 $ 1,409,179,000
30-89 Days DQ 559,000 1,913,000
90 Days DQ 747,000 $ 459,000
Residential loans, held-for-investment    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
90 Days DQ $ 67,612,000  
Residential loans, held-for-investment | Fixed Loans | Over $1,000 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.88%  
Residential Loans Held For Sale    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
90 Days DQ $ 747,000  
Residential Loans Held For Sale | Hybrid ARM Loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 108 93
Total Principal $ 87,144,000 $ 78,884,000
30-89 Days DQ 0 0
90 Days DQ $ 0 0
Residential Loans Held For Sale | Hybrid ARM Loans | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.50%  
Residential Loans Held For Sale | Hybrid ARM Loans | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 7.38%  
Residential Loans Held For Sale | Hybrid ARM Loans | $251 to $500    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 251,000 251,000
Loan Balance, maximum $ 500,000 $ 500,000
Number of Loans | loan 8 8
Total Principal $ 3,795,000 $ 3,708,000
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Residential Loans Held For Sale | Hybrid ARM Loans | $251 to $500 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.88% 3.25%
Residential Loans Held For Sale | Hybrid ARM Loans | $251 to $500 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.38% 3.88%
Residential Loans Held For Sale | Hybrid ARM Loans | $501 to $750    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 501,000 $ 501,000
Loan Balance, maximum $ 750,000 $ 750,000
Number of Loans | loan 50 44
Total Principal $ 31,759,000 $ 28,165,000
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Residential Loans Held For Sale | Hybrid ARM Loans | $501 to $750 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.63% 3.00%
Residential Loans Held For Sale | Hybrid ARM Loans | $501 to $750 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 7.38% 3.88%
Residential Loans Held For Sale | Hybrid ARM Loans | $751 to $1,000    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 751,000 $ 751,000
Loan Balance, maximum $ 1,000,000 $ 1,000,000
Number of Loans | loan 27 19
Total Principal $ 23,478,000 $ 16,675,000
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Residential Loans Held For Sale | Hybrid ARM Loans | $751 to $1,000 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.88% 2.88%
Residential Loans Held For Sale | Hybrid ARM Loans | $751 to $1,000 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.25% 4.00%
Residential Loans Held For Sale | Hybrid ARM Loans | Over $1,000    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, maximum $ 1,000,000 $ 1,000,000
Number of Loans | loan 23 22
Total Principal $ 28,112,000 $ 30,336,000
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Residential Loans Held For Sale | Hybrid ARM Loans | Over $1,000 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.50% 3.25%
Residential Loans Held For Sale | Hybrid ARM Loans | Over $1,000 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.50% 4.00%
Residential Loans Held For Sale | Fixed Loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 1,376 1,917
Total Principal $ 947,140,000 $ 1,329,851,000
30-89 Days DQ 559,000 1,913,000
90 Days DQ $ 747,000 459,000
Residential Loans Held For Sale | Fixed Loans | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.13%  
Residential Loans Held For Sale | Fixed Loans | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 7.00%  
Residential Loans Held For Sale | Fixed Loans | $0 to $250    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 0 0
Loan Balance, maximum $ 250,000 $ 250,000
Number of Loans | loan 6 1
Total Principal $ 1,180,000 $ 132,000
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Residential Loans Held For Sale | Fixed Loans | $0 to $250 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 4.38% 4.40%
Residential Loans Held For Sale | Fixed Loans | $0 to $250 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.75% 4.40%
Residential Loans Held For Sale | Fixed Loans | $251 to $500    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 251,000 $ 251,000
Loan Balance, maximum $ 500,000 $ 500,000
Number of Loans | loan 188 330
Total Principal $ 88,204,000 $ 153,021,000
30-89 Days DQ 0 495,000
90 Days DQ $ 0 $ 459,000
Residential Loans Held For Sale | Fixed Loans | $251 to $500 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.13% 3.25%
Residential Loans Held For Sale | Fixed Loans | $251 to $500 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 6.38% 5.63%
Residential Loans Held For Sale | Fixed Loans | $501 to $750    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 501,000 $ 501,000
Loan Balance, maximum $ 750,000 $ 750,000
Number of Loans | loan 788 1,005
Total Principal $ 475,935,000 $ 613,647,000
30-89 Days DQ 559,000 540,000
90 Days DQ $ 747,000 $ 0
Residential Loans Held For Sale | Fixed Loans | $501 to $750 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.75% 2.88%
Residential Loans Held For Sale | Fixed Loans | $501 to $750 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 7.00% 6.00%
Residential Loans Held For Sale | Fixed Loans | $751 to $1,000    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 751,000 $ 751,000
Loan Balance, maximum $ 1,000,000 $ 1,000,000
Number of Loans | loan 295 423
Total Principal $ 255,429,000 $ 370,379,000
30-89 Days DQ 0 878,000
90 Days DQ $ 0 $ 0
Residential Loans Held For Sale | Fixed Loans | $751 to $1,000 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.25% 3.00%
Residential Loans Held For Sale | Fixed Loans | $751 to $1,000 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 6.63% 6.25%
Residential Loans Held For Sale | Fixed Loans | Over $1,000    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, maximum $ 1,000,000 $ 1,000,000
Number of Loans | loan 99 158
Total Principal $ 126,392,000 $ 192,672,000
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Residential Loans Held For Sale | Fixed Loans | Over $1,000 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.75% 3.25%
Residential Loans Held For Sale | Fixed Loans | Over $1,000 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 6.13% 5.75%
Residential Loans Held For Sale | ARM Loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 2 3
Total Principal   $ 444,000
30-89 Days DQ   0
90 Days DQ $ 0 0
Residential Loans Held For Sale | ARM Loans | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 4.00%  
Residential Loans Held For Sale | ARM Loans | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 4.13%  
Residential Loans Held For Sale | ARM Loans | $0 to $250    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 0 0
Loan Balance, maximum $ 250,000 $ 250,000
Number of Loans | loan 2 2
Total Principal $ 150,000 $ 158,000
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Residential Loans Held For Sale | ARM Loans | $0 to $250 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 4.00% 2.88%
Residential Loans Held For Sale | ARM Loans | $0 to $250 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 4.13% 3.00%
Residential Loans Held For Sale | ARM Loans | $251 to $500    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum   $ 251,000
Loan Balance, maximum   $ 500,000
Number of Loans | loan   1
Total Principal   $ 286,000
30-89 Days DQ   0
90 Days DQ   $ 0
Residential Loans Held For Sale | ARM Loans | $251 to $500 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate   1.50%
Residential Loans Held For Sale | ARM Loans | $251 to $500 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate   1.50%
Legacy Sequoia | Residential loans, held-for-investment    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 2,641 3,178
Total Principal $ 545,209,000 $ 697,922,000
30-89 Days DQ 16,291,000 20,303,000
90 Days DQ $ 13,955,000 $ 25,457,000
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 21 33
Total Principal $ 9,466,000 $ 15,211,000
30-89 Days DQ 0 0
90 Days DQ $ 0 641,000
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.63%  
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.00%  
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $0 to $250    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 0 0
Loan Balance, maximum $ 250,000 $ 250,000
Number of Loans | loan 4 4
Total Principal $ 769,000 $ 530,000
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $0 to $250 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 4.63% 3.25%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $0 to $250 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.00% 3.75%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $251 to $500    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 251,000 $ 251,000
Loan Balance, maximum $ 500,000 $ 500,000
Number of Loans | loan 10 17
Total Principal $ 3,675,000 $ 6,170,000
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $251 to $500 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.63% 2.63%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $251 to $500 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 4.88% 3.75%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $501 to $750    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 501,000 $ 501,000
Loan Balance, maximum $ 750,000 $ 750,000
Number of Loans | loan 6 11
Total Principal $ 3,667,000 $ 7,091,000
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 641,000
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $501 to $750 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 4.38% 3.38%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $501 to $750 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.00% 3.75%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | Over $1,000    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum  
Loan Balance, maximum $ 1,000,000 $ 1,000,000
Number of Loans | loan 1 1
Total Principal $ 1,355,000 $ 1,420,000
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | Over $1,000 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 4.88% 3.75%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | Over $1,000 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 4.88% 3.75%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 2,620 3,145
Total Principal $ 535,743,000 $ 682,711,000
30-89 Days DQ 16,291,000 20,303,000
90 Days DQ $ 13,955,000 24,816,000
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 1.25%  
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.63%  
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $0 to $250    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 0 0
Loan Balance, maximum $ 250,000 $ 250,000
Number of Loans | loan 1,988 2,324
Total Principal $ 206,490,000 $ 253,438,000
30-89 Days DQ 7,179,000 7,436,000
90 Days DQ $ 3,952,000 $ 7,284,000
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $0 to $250 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 1.25% 1.25%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $0 to $250 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.50% 5.16%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $251 to $500    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 251,000 $ 251,000
Loan Balance, maximum $ 500,000 $ 500,000
Number of Loans | loan 424 541
Total Principal $ 148,154,000 $ 189,360,000
30-89 Days DQ 5,989,000 9,082,000
90 Days DQ $ 4,368,000 $ 9,178,000
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $251 to $500 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 1.25% 1.00%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $251 to $500 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.63% 5.63%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $501 to $750    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 501,000 $ 501,000
Loan Balance, maximum $ 750,000 $ 750,000
Number of Loans | loan 110 151
Total Principal $ 67,471,000 $ 91,244,000
30-89 Days DQ 1,309,000 1,995,000
90 Days DQ $ 1,880,000 $ 2,589,000
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $501 to $750 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 1.63% 1.63%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $501 to $750 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 4.50% 4.00%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $751 to $1,000    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 751,000 $ 751,000
Loan Balance, maximum $ 1,000,000 $ 1,000,000
Number of Loans | loan 61 76
Total Principal $ 51,918,000 $ 65,276,000
30-89 Days DQ 791,000 1,790,000
90 Days DQ $ 2,561,000 $ 1,725,000
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $751 to $1,000 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 1.63% 1.38%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $751 to $1,000 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 4.38% 3.38%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | Over $1,000    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum  
Loan Balance, maximum $ 1,000,000 $ 1,000,000
Number of Loans | loan 37 53
Total Principal $ 61,710,000 $ 83,393,000
30-89 Days DQ 1,023,000 0
90 Days DQ $ 1,194,000 $ 4,040,000
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | Over $1,000 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 1.63% 1.00%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | Over $1,000 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 4.38% 4.63%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 2,800 806
Total Principal $ 2,041,010,000 $ 604,747,000
30-89 Days DQ 10,789,000 1,158,000
90 Days DQ $ 1,905,000 0
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.75%  
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 6.50%  
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $0 to $250    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 0 0
Loan Balance, maximum $ 250,000 $ 250,000
Number of Loans | loan 29 4
Total Principal $ 5,484,000 $ 641,000
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $0 to $250 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.75% 2.75%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $0 to $250 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.63% 4.75%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $251 to $500    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 251,000 $ 251,000
Loan Balance, maximum $ 500,000 $ 500,000
Number of Loans | loan 336 85
Total Principal $ 149,917,000 $ 38,900,000
30-89 Days DQ 1,419,000 486,000
90 Days DQ $ 925,000 $ 0
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $251 to $500 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.13% 3.13%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $251 to $500 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 6.13% 5.75%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $501 to $750    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 501,000 $ 501,000
Loan Balance, maximum $ 750,000 $ 750,000
Number of Loans | loan 1,363 388
Total Principal $ 841,692,000 $ 240,538,000
30-89 Days DQ 3,633,000 672,000
90 Days DQ $ 0 $ 0
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $501 to $750 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.13% 3.13%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $501 to $750 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 6.38% 6.25%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $751 to $1,000    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 751,000 $ 751,000
Loan Balance, maximum $ 1,000,000 $ 1,000,000
Number of Loans | loan 761 239
Total Principal $ 659,845,000 $ 210,235,000
30-89 Days DQ 3,549,000 0
90 Days DQ $ 980,000 $ 0
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $751 to $1,000 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.25% 3.25%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $751 to $1,000 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 6.50% 6.50%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | Over $1,000    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, maximum $ 1,000,000 $ 1,000,000
Number of Loans | loan 311 90
Total Principal $ 384,072,000 $ 114,433,000
30-89 Days DQ 2,188,000 0
90 Days DQ $ 0 $ 0
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | Over $1,000 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.13% 3.13%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | Over $1,000 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.88% 5.88%
Freddie Mac SLST | Residential loans, held-for-investment | Fixed Loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 7,900  
Total Principal $ 1,310,974,000  
30-89 Days DQ 198,945,000  
90 Days DQ $ 50,528,000  
Freddie Mac SLST | Residential loans, held-for-investment | Fixed Loans | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.00%  
Freddie Mac SLST | Residential loans, held-for-investment | Fixed Loans | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 10.50%  
Freddie Mac SLST | Residential loans, held-for-investment | Fixed Loans | $0 to $250    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 0  
Loan Balance, maximum $ 250,000  
Number of Loans | loan 6,404  
Total Principal $ 830,118,000  
30-89 Days DQ 130,608,000  
90 Days DQ $ 30,686,000  
Freddie Mac SLST | Residential loans, held-for-investment | Fixed Loans | $0 to $250 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.00%  
Freddie Mac SLST | Residential loans, held-for-investment | Fixed Loans | $0 to $250 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 10.50%  
Freddie Mac SLST | Residential loans, held-for-investment | Fixed Loans | $251 to $500    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 251,000  
Loan Balance, maximum $ 500,000  
Number of Loans | loan 1,469  
Total Principal $ 466,222,000  
30-89 Days DQ 66,706,000  
90 Days DQ $ 19,319,000  
Freddie Mac SLST | Residential loans, held-for-investment | Fixed Loans | $251 to $500 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.00%  
Freddie Mac SLST | Residential loans, held-for-investment | Fixed Loans | $251 to $500 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 7.38%  
Freddie Mac SLST | Residential loans, held-for-investment | Fixed Loans | $501 to $750    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 501,000  
Loan Balance, maximum $ 750,000  
Number of Loans | loan 27  
Total Principal $ 14,634,000  
30-89 Days DQ 1,631,000  
90 Days DQ $ 523,000  
Freddie Mac SLST | Residential loans, held-for-investment | Fixed Loans | $501 to $750 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.00%  
Freddie Mac SLST | Residential loans, held-for-investment | Fixed Loans | $501 to $750 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.88%  
Redwood | Residential loans, held-for-investment    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 3,296 3,292
Total Principal $ 2,385,330,000 $ 2,407,993,000
30-89 Days DQ 6,086,000 10,978,000
90 Days DQ $ 1,224,000 $ 0
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 385 259
Total Principal $ 303,566,000 $ 203,461,000
30-89 Days DQ 1,863,000 3,214,000
90 Days DQ $ 0 0
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.63%  
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 6.38%  
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $0 to $250    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 0 0
Loan Balance, maximum $ 250,000 $ 250,000
Number of Loans | loan 12 7
Total Principal $ 2,190,000 $ 1,589,000
30-89 Days DQ 59,000 438,000
90 Days DQ $ 0 $ 0
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $0 to $250 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.88% 3.50%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $0 to $250 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 4.88% 3.88%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $251 to $500    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 251,000 $ 251,000
Loan Balance, maximum $ 500,000 $ 500,000
Number of Loans | loan 59 43
Total Principal $ 23,986,000 $ 16,703,000
30-89 Days DQ 0 566,000
90 Days DQ $ 0 $ 0
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $251 to $500 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.63% 2.63%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $251 to $500 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.75% 4.88%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $501 to $750    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 501,000 $ 501,000
Loan Balance, maximum $ 750,000 $ 750,000
Number of Loans | loan 116 87
Total Principal $ 73,360,000 $ 55,709,000
30-89 Days DQ 692,000 1,226,000
90 Days DQ $ 0 $ 0
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $501 to $750 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.88% 2.88%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $501 to $750 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.75% 5.13%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $751 to $1,000    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 751,000 $ 751,000
Loan Balance, maximum $ 1,000,000 $ 1,000,000
Number of Loans | loan 129 82
Total Principal $ 111,879,000 $ 71,819,000
30-89 Days DQ 0 984,000
90 Days DQ $ 0 $ 0
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $751 to $1,000 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.88% 2.88%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $751 to $1,000 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 6.38% 6.00%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | Over $1,000    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, maximum $ 1,000,000 $ 1,000,000
Number of Loans | loan 69 40
Total Principal $ 92,151,000 $ 57,641,000
30-89 Days DQ 1,112,000 0
90 Days DQ $ 0 $ 0
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | Over $1,000 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.00% 3.00%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | Over $1,000 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.50% 5.00%
Redwood | Residential loans, held-for-investment | Fixed Loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 2,911 3,033
Total Principal $ 2,081,764,000 $ 2,204,532,000
30-89 Days DQ 4,223,000 7,764,000
90 Days DQ $ 1,224,000 0
Redwood | Residential loans, held-for-investment | Fixed Loans | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.75%  
Redwood | Residential loans, held-for-investment | Fixed Loans | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 6.75%  
Redwood | Residential loans, held-for-investment | Fixed Loans | $0 to $250    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 0 0
Loan Balance, maximum $ 250,000 $ 250,000
Number of Loans | loan 36 34
Total Principal $ 6,737,000 $ 6,758,000
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Redwood | Residential loans, held-for-investment | Fixed Loans | $0 to $250 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.30% 3.13%
Redwood | Residential loans, held-for-investment | Fixed Loans | $0 to $250 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.08% 5.08%
Redwood | Residential loans, held-for-investment | Fixed Loans | $251 to $500    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 251,000 $ 251,000
Loan Balance, maximum $ 500,000 $ 500,000
Number of Loans | loan 679 681
Total Principal $ 292,730,000 $ 296,950,000
30-89 Days DQ 0 1,380,000
90 Days DQ $ 0 $ 0
Redwood | Residential loans, held-for-investment | Fixed Loans | $251 to $500 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.75% 2.80%
Redwood | Residential loans, held-for-investment | Fixed Loans | $251 to $500 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 5.75% 6.13%
Redwood | Residential loans, held-for-investment | Fixed Loans | $501 to $750    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 501,000 $ 501,000
Loan Balance, maximum $ 750,000 $ 750,000
Number of Loans | loan 1,213 1,261
Total Principal $ 746,503,000 $ 777,103,000
30-89 Days DQ 1,320,000 3,818,000
90 Days DQ $ 1,224,000 $ 0
Redwood | Residential loans, held-for-investment | Fixed Loans | $501 to $750 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.75% 2.75%
Redwood | Residential loans, held-for-investment | Fixed Loans | $501 to $750 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 6.75% 6.75%
Redwood | Residential loans, held-for-investment | Fixed Loans | $751 to $1,000    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum $ 751,000 $ 751,000
Loan Balance, maximum $ 1,000,000 $ 1,000,000
Number of Loans | loan 599 649
Total Principal $ 517,075,000 $ 559,426,000
30-89 Days DQ 903,000 2,566,000
90 Days DQ $ 0 $ 0
Redwood | Residential loans, held-for-investment | Fixed Loans | $751 to $1,000 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.75% 2.75%
Redwood | Residential loans, held-for-investment | Fixed Loans | $751 to $1,000 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 6.13% 5.00%
Redwood | Residential loans, held-for-investment | Fixed Loans | Over $1,000    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Loan Balance, minimum  
Loan Balance, maximum $ 1,000,000 $ 1,000,000
Number of Loans | loan 384 408
Total Principal $ 518,719,000 $ 564,295,000
30-89 Days DQ 2,000,000 0
90 Days DQ $ 0 $ 0
Redwood | Residential loans, held-for-investment | Fixed Loans | Over $1,000 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 2.80% 2.80%
Redwood | Residential loans, held-for-investment | Fixed Loans | Over $1,000 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate   5.00%