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Residential Loans - Loan Product Type and Accompanying Loan Characteristics of Residential Loans (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 669 1,484
Total Principal $ 524,928 $ 1,034,284
30-89 Days DQ 1,650 559
90 Days DQ 747 $ 747
Residential loans, held-for-investment    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
90 Days DQ $ 153,319  
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, at fair value    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
90 Days DQ $ 747  
Residential loans, held-for-sale, at fair value | Fixed loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 554 1,376
Total Principal $ 433,045 $ 947,140
30-89 Days DQ 1,650 559
90 Days DQ $ 747 747
Residential loans, held-for-sale, at fair value | Fixed loans | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.20%  
Residential loans, held-for-sale, at fair value | Fixed loans | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 7.13%  
Residential loans, held-for-sale, at fair value | 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 $ 250
Number of Loans | loan 2 6
Total Principal $ 481 $ 1,180
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Residential loans, held-for-sale, at fair value | Fixed loans | $0 to $250 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.88% 4.38%
Residential loans, held-for-sale, at fair value | Fixed loans | $0 to $250 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 7.13% 5.75%
Residential loans, held-for-sale, at fair value | 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 $ 251
Loan Balance, maximum $ 500 $ 500
Number of Loans | loan 13 188
Total Principal $ 6,234 $ 88,204
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Residential loans, held-for-sale, at fair value | Fixed loans | $251 to $500 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.63% 3.13%
Residential loans, held-for-sale, at fair value | Fixed loans | $251 to $500 | Maximum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 6.50% 6.38%
Residential loans, held-for-sale, at fair value | 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 $ 501
Loan Balance, maximum $ 750 $ 750
Number of Loans | loan 301 788
Total Principal $ 186,251 $ 475,935
30-89 Days DQ 0 559
90 Days DQ $ 747 $ 747
Residential loans, held-for-sale, at fair value | Fixed loans | $501 to $750 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.20% 3.75%
Residential loans, held-for-sale, at fair value | 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% 7.00%
Residential loans, held-for-sale, at fair value | 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 $ 751
Loan Balance, maximum $ 1,000 $ 1,000
Number of Loans | loan 161 295
Total Principal $ 139,786 $ 255,429
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Residential loans, held-for-sale, at fair value | 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 3.50% 3.25%
Residential loans, held-for-sale, at fair value | 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% 6.63%
Residential loans, held-for-sale, at fair value | 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 $ 1,000
Number of Loans | loan 77 99
Total Principal $ 100,293 $ 126,392
30-89 Days DQ 1,650 0
90 Days DQ $ 0 $ 0
Residential loans, held-for-sale, at fair value | Fixed loans | Over $1,000 | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.20% 3.75%
Residential loans, held-for-sale, at fair value | 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% 6.13%
Residential loans, held-for-sale, at fair value | ARM loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 2  
90 Days DQ $ 0  
Residential loans, held-for-sale, at fair value | ARM loans | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.38%  
Residential loans, held-for-sale, at fair value | ARM loans | Maximum    
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, at fair value | Hybrid ARM loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Loans | loan 115 108
Total Principal $ 91,883 $ 87,144
30-89 Days DQ 0 0
90 Days DQ $ 0 0
Residential loans, held-for-sale, at fair value | Hybrid ARM loans | Minimum    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Interest Rate 3.00%  
Residential loans, held-for-sale, at fair value | Hybrid ARM 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, at fair value | 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  
Loan Balance, maximum $ 250  
Number of Loans | loan 7  
Total Principal $ 1,254  
30-89 Days DQ 0  
90 Days DQ $ 0  
Residential loans, held-for-sale, at fair value | 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 5.20%  
Residential loans, held-for-sale, at fair value | 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 7.00%  
Residential loans, held-for-sale, at fair value | 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 $ 251 251
Loan Balance, maximum $ 500 $ 500
Number of Loans | loan 1 8
Total Principal $ 432 $ 3,795
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Residential loans, held-for-sale, at fair value | 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 4.25% 3.88%
Residential loans, held-for-sale, at fair value | 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 4.25% 5.38%
Residential loans, held-for-sale, at fair value | 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 $ 501
Loan Balance, maximum $ 750 $ 750
Number of Loans | loan 52 50
Total Principal $ 33,611 $ 31,759
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Residential loans, held-for-sale, at fair value | 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 3.00% 3.63%
Residential loans, held-for-sale, at fair value | 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 5.50% 7.38%
Residential loans, held-for-sale, at fair value | 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 $ 751
Loan Balance, maximum $ 1,000 $ 1,000
Number of Loans | loan 33 27
Total Principal $ 28,573 $ 23,478
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Residential loans, held-for-sale, at fair value | 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 3.25% 3.88%
Residential loans, held-for-sale, at fair value | 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 4.88% 5.25%
Residential loans, held-for-sale, at fair value | 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 $ 1,000
Number of Loans | loan 22 23
Total Principal $ 28,013 $ 28,112
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
Residential loans, held-for-sale, at fair value | 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 3.25% 3.50%
Residential loans, held-for-sale, at fair value | 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 5.25% 5.50%
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 2,198 2,641
Total Principal $ 424,830 $ 545,209
30-89 Days DQ 15,739 16,291
90 Days DQ $ 9,803 $ 13,955
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 2,186 2,620
Total Principal $ 419,399 $ 535,743
30-89 Days DQ 15,739 16,291
90 Days DQ $ 9,803 13,955
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 6.00%  
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 $ 250
Number of Loans | loan 1,685 1,988
Total Principal $ 169,230 $ 206,490
30-89 Days DQ 5,135 7,179
90 Days DQ $ 3,109 $ 3,952
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 1.38% 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 6.00% 5.50%
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 $ 251
Loan Balance, maximum $ 500 $ 500
Number of Loans | loan 345 424
Total Principal $ 120,261 $ 148,154
30-89 Days DQ 6,149 5,989
90 Days DQ $ 3,835 $ 4,368
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% 1.25%
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 $ 501
Loan Balance, maximum $ 750 $ 750
Number of Loans | loan 87 110
Total Principal $ 53,811 $ 67,471
30-89 Days DQ 3,628 1,309
90 Days DQ $ 1,211 $ 1,880
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 4.38% 4.50%
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 $ 751
Loan Balance, maximum $ 1,000 $ 1,000
Number of Loans | loan 45 61
Total Principal $ 37,756 $ 51,918
30-89 Days DQ 827 791
90 Days DQ $ 1,648 $ 2,561
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% 1.63%
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% 4.38%
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 $ 1,000
Number of Loans | loan 24 37
Total Principal $ 38,341 $ 61,710
30-89 Days DQ 0 1,023
90 Days DQ $ 0 $ 1,194
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% 1.63%
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 4.00% 4.38%
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 12 21
Total Principal $ 5,431 $ 9,466
30-89 Days DQ 0 0
90 Days DQ $ 0 0
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 3.63%  
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 5.13%  
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 $ 250
Number of Loans | loan 2 4
Total Principal $ 465 $ 769
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 4.25% 4.63%
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 4.50% 5.00%
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 $ 251
Loan Balance, maximum $ 500 $ 500
Number of Loans | loan 7 10
Total Principal $ 2,494 $ 3,675
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 3.63% 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 5.13% 4.88%
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 $ 501
Loan Balance, maximum $ 750 $ 750
Number of Loans | loan 2 6
Total Principal $ 1,181 $ 3,667
30-89 Days DQ 0 0
90 Days DQ $ 0 $ 0
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 4.50% 4.38%
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 4.50% 5.00%
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 $ 1,000
Number of Loans | loan 1 1
Total Principal $ 1,291 $ 1,355
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 4.50% 4.88%
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 4.50% 4.88%
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 3,156 2,800
Total Principal $ 2,240,680 $ 2,041,010
30-89 Days DQ 24,266 10,789
90 Days DQ $ 6,756 1,905
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 6.75%  
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 $ 250
Number of Loans | loan 56 29
Total Principal $ 10,743 $ 5,484
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 5.50% 5.63%
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 $ 251
Loan Balance, maximum $ 500 $ 500
Number of Loans | loan 420 336
Total Principal $ 184,455 $ 149,917
30-89 Days DQ 2,282 1,419
90 Days DQ $ 0 $ 925
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% 6.13%
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 $ 501
Loan Balance, maximum $ 750 $ 750
Number of Loans | loan 1,528 1,363
Total Principal $ 940,914 $ 841,692
30-89 Days DQ 13,020 3,633
90 Days DQ $ 2,366 $ 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 6.75% 6.38%
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 $ 751
Loan Balance, maximum $ 1,000 $ 1,000
Number of Loans | loan 835 761
Total Principal $ 719,609 $ 659,845
30-89 Days DQ 7,856 3,549
90 Days DQ $ 3,297 $ 980
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 $ 1,000
Number of Loans | loan 317 311
Total Principal $ 384,959 $ 384,072
30-89 Days DQ 1,108 2,188
90 Days DQ $ 1,093 $ 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 3.50% 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 14,502 7,900
Total Principal $ 2,428,034 $ 1,310,974
30-89 Days DQ 785,132 198,945
90 Days DQ $ 135,175 50,528
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 11.00%  
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 0
Loan Balance, maximum $ 250 $ 250
Number of Loans | loan 11,639 6,404
Total Principal $ 1,501,538 $ 830,118
30-89 Days DQ 477,592 130,608
90 Days DQ $ 79,632 $ 30,686
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% 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 11.00% 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 $ 251
Loan Balance, maximum $ 500 $ 500
Number of Loans | loan 2,805 1,469
Total Principal $ 894,125 $ 466,222
30-89 Days DQ 297,732 66,706
90 Days DQ $ 52,920 $ 19,319
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% 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 7.75% 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 $ 501
Loan Balance, maximum $ 750 $ 750
Number of Loans | loan 57 27
Total Principal $ 31,350 $ 14,634
30-89 Days DQ 8,787 1,631
90 Days DQ $ 2,623 $ 523
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% 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 6.75% 5.88%
Freddie Mac SLST | 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  
Number of Loans | loan 1  
Total Principal $ 1,021  
30-89 Days DQ 1,021  
90 Days DQ $ 0  
Freddie Mac SLST | 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 4.00%  
Freddie Mac SLST | 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 4.00%  
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 2,940 3,296
Total Principal $ 2,052,778 $ 2,385,330
30-89 Days DQ 12,221 6,086
90 Days DQ $ 1,585 $ 1,224
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 2,641 2,911
Total Principal $ 1,825,379 $ 2,081,764
30-89 Days DQ 7,645 4,223
90 Days DQ $ 614 1,224
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 $ 250
Number of Loans | loan 38 36
Total Principal $ 6,549 $ 6,737
30-89 Days DQ 223 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 2.90% 3.30%
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 4.80% 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 $ 251
Loan Balance, maximum $ 500 $ 500
Number of Loans | loan 676 679
Total Principal $ 287,984 $ 292,730
30-89 Days DQ 0 0
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% 2.75%
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 6.00% 5.75%
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 $ 501
Loan Balance, maximum $ 750 $ 750
Number of Loans | loan 1,091 1,213
Total Principal $ 669,159 $ 746,503
30-89 Days DQ 2,325 1,320
90 Days DQ $ 614 $ 1,224
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 2.80% 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 $ 751
Loan Balance, maximum $ 1,000 $ 1,000
Number of Loans | loan 519 599
Total Principal $ 447,499 $ 517,075
30-89 Days DQ 1,895 903
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 6.63% 6.13%
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 $ 1,000
Number of Loans | loan 317 384
Total Principal $ 414,188 $ 518,719
30-89 Days DQ 3,202 2,000
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 3.00% 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   5.88%
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 299 385
Total Principal $ 227,399 $ 303,566
30-89 Days DQ 4,576 1,863
90 Days DQ $ 971 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 2.875%  
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 6.00%  
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 $ 250
Number of Loans | loan 12 12
Total Principal $ 2,423 $ 2,190
30-89 Days DQ 0 59
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 3.50% 2.88%
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 4.50% 4.88%
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 $ 251
Loan Balance, maximum $ 500 $ 500
Number of Loans | loan 51 59
Total Principal $ 20,781 $ 23,986
30-89 Days DQ 0 0
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 3.25% 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 5.63% 5.75%
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 $ 501
Loan Balance, maximum $ 750 $ 750
Number of Loans | loan 97 116
Total Principal $ 61,708 $ 73,360
30-89 Days DQ 1,364 692
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 5.13% 5.75%
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 $ 751
Loan Balance, maximum $ 1,000 $ 1,000
Number of Loans | loan 90 129
Total Principal $ 77,550 $ 111,879
30-89 Days DQ 1,784 0
90 Days DQ $ 971 $ 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 6.00% 6.38%
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 $ 1,000
Number of Loans | loan 49 69
Total Principal $ 64,937 $ 92,151
30-89 Days DQ 1,428 1,112
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% 5.50%