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Residential Loans - Loan Product Type and Accompanying Loan Characteristics of Residential Loans (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
loan
Dec. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
tranche
Dec. 31, 2021
USD ($)
tranche
loan
Residential loans, held-for-sale, at fair value        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Number of Loans | tranche     994 2,196
Total Principal $ 822,063 $ 822,063 $ 822,063 $ 1,813,865
30-89 Days DQ 5,282 5,282 5,282 0
90+ Days DQ $ 208 208 $ 208 $ 2,923
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 8   8 57
Total Principal $ 4,403 4,403 $ 4,403 $ 51,393
30-89 Days DQ 0 0 0 0
90+ Days DQ 0 $ 0 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   3.63%    
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   6.50%    
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 $ 0 0 0
Loan Balance, maximum $ 250 250 250 $ 250
Number of Loans | loan 1     1
Total Principal $ 41 41 41 $ 45
30-89 Days DQ 0 0 0 0
90+ Days DQ 0 $ 0 0 $ 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   6.00%   1.88%
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   6.00%   1.88%
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
Loan Balance, maximum       $ 500
Number of Loans | loan       4
Total Principal       $ 1,880
30-89 Days DQ       0
90+ Days DQ       $ 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       3.25%
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       3.50%
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 $ 501 501 $ 501
Loan Balance, maximum $ 750 750 750 $ 750
Number of Loans | loan 6     18
Total Principal $ 3,590 3,590 3,590 $ 11,872
30-89 Days DQ 0 0 0 0
90+ Days DQ 0 $ 0 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   3.63%   2.38%
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   6.50%   3.63%
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 $ 751 751 $ 751
Loan Balance, maximum $ 1,000 1,000 1,000 $ 1,000
Number of Loans | loan 1     14
Total Principal $ 772 772 772 $ 12,288
30-89 Days DQ 0 0 0 0
90+ Days DQ $ 0 $ 0 $ 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   4.25%   2.50%
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   4.25%   4.00%
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
Number of Loans | loan       20
Total Principal       $ 25,308
30-89 Days DQ       0
90+ Days DQ       $ 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       2.38%
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       3.88%
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 986   986 2,139
Total Principal $ 817,660 $ 817,660 $ 817,660 $ 1,762,472
30-89 Days DQ 5,282 5,282 5,282 0
90+ Days DQ 208 $ 208 208 2,923
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   2.75%    
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   9.25%    
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 0 0
Loan Balance, maximum $ 250 250 250 $ 250
Number of Loans | loan 25     63
Total Principal $ 4,088 4,088 4,088 $ 11,118
30-89 Days DQ 0 0 0 0
90+ Days DQ 208 $ 208 208 $ 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   3.13%   3.13%
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   5.63%   5.00%
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 $ 251 251 $ 251
Loan Balance, maximum $ 500 500 500 $ 500
Number of Loans | loan 138     133
Total Principal $ 57,202 57,202 57,202 $ 51,737
30-89 Days DQ 444 444 444 0
90+ Days DQ 0 $ 0 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   3.38%   2.75%
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   8.25%   5.50%
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 $ 501 501 $ 501
Loan Balance, maximum $ 750 750 750 $ 750
Number of Loans | loan 283     790
Total Principal $ 186,202 186,202 186,202 $ 514,785
30-89 Days DQ 537 537 537 0
90+ Days DQ 0 $ 0 0 $ 1,093
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   2.88%   2.50%
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   8.25%   5.88%
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 $ 751 751 $ 751
Loan Balance, maximum $ 1,000 1,000 1,000 $ 1,000
Number of Loans | loan 286     735
Total Principal $ 248,246 248,246 248,246 $ 642,372
30-89 Days DQ 1,726 1,726 1,726 0
90+ Days DQ 0 $ 0 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   2.75%   2.63%
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   9.25%   5.63%
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 1,000 $ 1,000
Number of Loans | loan 254     418
Total Principal $ 321,922 321,922 321,922 $ 542,460
30-89 Days DQ 2,575 2,575 2,575 0
90+ Days DQ 0 $ 0 0 $ 1,830
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   2.88%   2.50%
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   9.13%   4.75%
Residential loans, held-for-investment        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
90+ Days DQ $ 224,020 $ 224,020 224,020  
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 1,304     1,583
Total Principal $ 204,404 204,404 204,404 $ 264,056
30-89 Days DQ 7,001 7,001 7,001 9,561
90+ Days DQ $ 6,824 6,824 6,824 $ 7,482
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 7     9
Total Principal $ 2,031 2,031 2,031 $ 3,649
30-89 Days DQ 0 0 0 0
90+ Days DQ 0 $ 0 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   2.88%    
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   4.63%    
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 0 0
Loan Balance, maximum $ 250 250 250 $ 250
Number of Loans | loan 3     3
Total Principal $ 610 610 610 $ 650
30-89 Days DQ 0 0 0 0
90+ Days DQ 0 $ 0 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%   2.63%
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   4.63%   2.63%
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 $ 251 251 $ 251
Loan Balance, maximum $ 500 500 500 $ 500
Number of Loans | loan 4     4
Total Principal $ 1,421 1,421 1,421 $ 1,341
30-89 Days DQ 0 0 0 0
90+ Days DQ $ 0 $ 0 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   2.88%   2.50%
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   4.63%   2.63%
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
Loan Balance, maximum       $ 750
Number of Loans | loan       1
Total Principal       $ 518
30-89 Days DQ       0
90+ Days DQ       $ 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       2.50%
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       2.50%
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
Number of Loans | loan       1
Total Principal       $ 1,140
30-89 Days DQ       0
90+ Days DQ       $ 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       2.63%
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       2.63%
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 1,297     1,574
Total Principal $ 202,373 $ 202,373 202,373 $ 260,407
30-89 Days DQ 7,001 7,001 7,001 9,561
90+ Days DQ 6,824 $ 6,824 6,824 7,482
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   6.13%    
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 0 0
Loan Balance, maximum $ 250 250 250 $ 250
Number of Loans | loan 1,070     1,273
Total Principal $ 93,286 93,286 93,286 $ 115,437
30-89 Days DQ 3,792 3,792 3,792 3,189
90+ Days DQ 2,607 $ 2,607 2,607 $ 2,691
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%   0.38%
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   6.13%   5.63%
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 $ 251 251 $ 251
Loan Balance, maximum $ 500 500 500 $ 500
Number of Loans | loan 158     206
Total Principal $ 54,904 54,904 54,904 $ 71,306
30-89 Days DQ 1,232 1,232 1,232 2,831
90+ Days DQ 1,649 $ 1,649 1,649 $ 2,124
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%   0.75%
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   6.13%   3.88%
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 $ 501 501 $ 501
Loan Balance, maximum $ 750 750 750 $ 750
Number of Loans | loan 47     68
Total Principal $ 28,796 28,796 28,796 $ 42,128
30-89 Days DQ 0 0 0 555
90+ Days DQ 1,796 $ 1,796 1,796 $ 1,842
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%   0.25%
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   5.38%   4.13%
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 $ 751 751 $ 751
Loan Balance, maximum $ 1,000 1,000 1,000 $ 1,000
Number of Loans | loan 13     15
Total Principal $ 11,047 11,047 11,047 $ 12,868
30-89 Days DQ 929 929 929 1,811
90+ Days DQ 772 $ 772 772 $ 825
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%   0.75%
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   6.00%   3.75%
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 1,000 $ 1,000
Number of Loans | loan 9     12
Total Principal $ 14,340 14,340 14,340 $ 18,668
30-89 Days DQ 1,048 1,048 1,048 1,175
90+ Days DQ $ 0 $ 0 0 $ 0
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%   0.88%
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   5.63%   2.00%
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 4,624     4,300
Total Principal $ 3,847,091 $ 3,847,091 3,847,091 $ 3,605,471
30-89 Days DQ 15,522 15,522 15,522 31,460
90+ Days DQ $ 7,799 7,799 7,799 $ 15,124
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 17     28
Total Principal $ 13,295 13,295 13,295 $ 22,665
30-89 Days DQ 0 0 0 191
90+ Days DQ 637 $ 637 637 0
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   3.38%    
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   5.63%    
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
Loan Balance, maximum       $ 250
Number of Loans | loan       2
Total Principal       $ 397
30-89 Days DQ       191
90+ Days DQ       $ 0
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       5.50%
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       6.75%
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 $ 251 251 $ 251
Loan Balance, maximum $ 500 500 500 $ 500
Number of Loans | loan 2     3
Total Principal $ 798 798 798 $ 1,354
30-89 Days DQ 0 0 0 0
90+ Days DQ 0 $ 0 0 $ 0
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   3.50%   3.25%
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   3.63%   3.63%
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 $ 501 501 $ 501
Loan Balance, maximum $ 750 750 750 $ 750
Number of Loans | loan 8     8
Total Principal $ 5,370 5,370 5,370 $ 5,321
30-89 Days DQ 0 0 0 0
90+ Days DQ 637 $ 637 637 $ 0
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   3.38%   3.38%
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   4.38%   4.50%
Sequoia | 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 $ 751 751 $ 751
Loan Balance, maximum $ 1,000 1,000 1,000 $ 1,000
Number of Loans | loan 4     8
Total Principal $ 3,294 3,294 3,294 $ 6,659
30-89 Days DQ 0 0 0 0
90+ Days DQ 0 $ 0 0 $ 0
Sequoia | 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   4.00%   3.13%
Sequoia | 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   5.63%   5.00%
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, maximum $ 1,000 $ 1,000 1,000 $ 1,000
Number of Loans | loan 3     7
Total Principal $ 3,833 3,833 3,833 $ 8,934
30-89 Days DQ 0 0 0 0
90+ Days DQ $ 0 $ 0 0 $ 0
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   4.00%   3.50%
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   5.00%   5.00%
Sequoia | 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 4,607     4,272
Total Principal $ 3,833,796 $ 3,833,796 3,833,796 $ 3,582,806
30-89 Days DQ 15,522 15,522 15,522 31,269
90+ Days DQ 7,162 $ 7,162 7,162 15,124
Sequoia | 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   1.88%    
Sequoia | 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 | 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 0 0
Loan Balance, maximum $ 250 250 250 $ 250
Number of Loans | loan 52     43
Total Principal $ 9,145 9,145 9,145 $ 8,630
30-89 Days DQ 0 0 0 0
90+ Days DQ 0 $ 0 0 $ 0
Sequoia | 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   2.63%   2.75%
Sequoia | 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   5.25%   5.13%
Sequoia | 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 $ 251 251 $ 251
Loan Balance, maximum $ 500 500 500 $ 500
Number of Loans | loan 146     162
Total Principal $ 61,208 61,208 61,208 $ 69,442
30-89 Days DQ 2,348 2,348 2,348 2,390
90+ Days DQ 877 $ 877 877 $ 462
Sequoia | 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   2.38%   2.50%
Sequoia | 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   6.75%   6.13%
Sequoia | 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 $ 501 501 $ 501
Loan Balance, maximum $ 750 750 750 $ 750
Number of Loans | loan 1,884     1,691
Total Principal $ 1,211,531 1,211,531 1,211,531 $ 1,093,766
30-89 Days DQ 7,064 7,064 7,064 10,894
90+ Days DQ 1,840 $ 1,840 1,840 $ 3,498
Sequoia | 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   2.13%   2.13%
Sequoia | 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%   6.75%
Sequoia | 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 $ 751 751 $ 751
Loan Balance, maximum $ 1,000 1,000 1,000 $ 1,000
Number of Loans | loan 1,600     1,497
Total Principal $ 1,396,210 1,396,210 1,396,210 $ 1,311,640
30-89 Days DQ 2,425 2,425 2,425 9,477
90+ Days DQ 1,849 $ 1,849 1,849 $ 4,931
Sequoia | 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   2.13%   2.13%
Sequoia | 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   6.00%   6.25%
Sequoia | 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 1,000 $ 1,000
Number of Loans | loan 925     879
Total Principal $ 1,155,702 1,155,702 1,155,702 $ 1,099,328
30-89 Days DQ 3,685 3,685 3,685 8,508
90+ Days DQ $ 2,596 $ 2,596 2,596 $ 6,233
Sequoia | 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   1.88%   1.88%
Sequoia | 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 10,882     11,986
Total Principal $ 1,719,236 $ 1,719,236 1,719,236 $ 1,932,241
30-89 Days DQ 302,095 302,095 302,095 341,046
90+ Days DQ 209,397 $ 209,397 209,397 212,961
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 0 0
Loan Balance, maximum $ 250 250 250 $ 250
Number of Loans | loan 8,979     9,798
Total Principal $ 1,105,116 1,105,116 1,105,116 $ 1,224,173
30-89 Days DQ 197,718 197,718 197,718 222,541
90+ Days DQ 120,210 $ 120,210 120,210 $ 114,622
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%   11.00%
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 $ 251 251 $ 251
Loan Balance, maximum $ 500 500 500 $ 500
Number of Loans | loan 1,867     2,141
Total Principal $ 593,781 593,781 593,781 $ 681,885
30-89 Days DQ 103,339 103,339 103,339 114,360
90+ Days DQ 80,993 $ 80,993 80,993 $ 91,149
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%   7.75%
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 $ 501 501 $ 501
Loan Balance, maximum $ 750 750 750 $ 750
Number of Loans | loan 35     46
Total Principal $ 19,328 19,328 19,328 $ 25,165
30-89 Days DQ 1,038 1,038 1,038 3,127
90+ Days DQ 7,184 $ 7,184 7,184 $ 7,190
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   5.50%   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 $ 1,000 1,000 $ 1,000
Number of Loans | loan 1     1
Total Principal $ 1,010 1,010 1,010 $ 1,018
30-89 Days DQ 0 0 0 1,018
90+ Days DQ $ 1,010 $ 1,010 $ 1,010 $ 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%   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%   4.00%