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Residential Loans - Loan Product Type and Accompanying Loan Characteristics of Residential Loans (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
loan
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
tranche
Dec. 31, 2020
USD ($)
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     2,196 198
Total Principal $ 1,813,865 $ 1,813,865 $ 1,813,865 $ 172,748
30-89 Days DQ 0 0 0 3,362
90+ Days DQ $ 2,923 2,923 $ 2,923 $ 1,882
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 57   57 2
Total Principal $ 51,393 51,393 $ 51,393 $ 1,019
30-89 Days DQ 0 0 0 970
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   1.88%    
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   4.00%    
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 $ 0 0 0
Loan Balance, maximum $ 250 250 250 $ 250
Number of Loans | loan 1     1
Total Principal $ 45 45 45 $ 49
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   1.88%   2.00%
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   1.88%   2.00%
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 $ 251 251  
Loan Balance, maximum $ 500 500 500  
Number of Loans | loan 4      
Total Principal $ 1,880 1,880 1,880  
30-89 Days DQ 0 0 0  
90+ Days DQ 0 $ 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   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  
Loan Balance, maximum $ 750 750 750  
Number of Loans | loan 18      
Total Principal $ 11,872 11,872 11,872  
30-89 Days DQ 0 0 0  
90+ Days DQ 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   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   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 14     1
Total Principal $ 12,288 12,288 12,288 $ 970
30-89 Days DQ 0 0 0 970
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   2.50%   4.38%
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   4.00%   4.38%
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 1,000  
Number of Loans | loan 20      
Total Principal $ 25,308 25,308 25,308  
30-89 Days DQ 0 0 0  
90+ Days DQ $ 0 $ 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   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 2,139   2,139 196
Total Principal $ 1,762,472 $ 1,762,472 $ 1,762,472 $ 171,729
30-89 Days DQ 0 0 0 2,392
90+ Days DQ 2,923 $ 2,923 2,923 1,882
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   2.50%    
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   5.88%    
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 63     1
Total Principal $ 11,118 11,118 11,118 $ 219
30-89 Days DQ 0 0 0 219
90+ Days DQ 0 $ 0 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   3.13%   4.69%
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   5.00%   4.69%
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 133     0
Total Principal $ 51,737 51,737 51,737 $ 0
30-89 Days DQ 0 0 0 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   2.75%   0.00%
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   5.50%   0.00%
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 790     75
Total Principal $ 514,785 514,785 514,785 $ 48,933
30-89 Days DQ 0 0 0 1,127
90+ Days DQ 1,093 $ 1,093 1,093 $ 0
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   2.50%   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   5.88%   5.50%
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 735     80
Total Principal $ 642,372 642,372 642,372 $ 71,137
30-89 Days DQ 0 0 0 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   2.63%   2.38%
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   5.63%   4.63%
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 418     40
Total Principal $ 542,460 542,460 542,460 $ 51,440
30-89 Days DQ 0 0 0 1,046
90+ Days DQ 1,830 $ 1,830 1,830 $ 1,882
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   2.50%   2.38%
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   4.75%   5.00%
Residential loans, held-for-investment        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
90+ Days DQ $ 235,567 $ 235,567 235,567  
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 1,583     1,908
Total Principal $ 264,056 264,056 264,056 $ 333,474
30-89 Days DQ 9,561 9,561 9,561 7,240
90+ Days DQ $ 7,482 7,482 7,482 $ 17,285
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 9     9
Total Principal $ 3,649 3,649 3,649 $ 3,964
30-89 Days DQ 0 0 0 410
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   2.50%    
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   2.63%    
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     2
Total Principal $ 650 650 650 $ 439
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   2.63%   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   2.63%   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     5
Total Principal $ 1,341 1,341 1,341 $ 1,748
30-89 Days DQ 0 0 0 410
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   2.50%   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   2.63%   4.00%
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 $ 501 501 $ 501
Loan Balance, maximum $ 750 750 750 $ 750
Number of Loans | loan 1     1
Total Principal $ 518 518 518 $ 556
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 | $501 to $750 | Minimum        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Interest Rate   2.50%   2.75%
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%   2.75%
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 1,000 1,000 $ 1,000
Number of Loans | loan 1     1
Total Principal $ 1,140 1,140 1,140 $ 1,221
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 | Over $1,000 | 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 | Over $1,000 | Maximum        
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 | ARM loans        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Number of Loans | loan 1,574     1,899
Total Principal $ 260,407 $ 260,407 260,407 $ 329,510
30-89 Days DQ 9,561 9,561 9,561 6,830
90+ Days DQ 7,482 $ 7,482 7,482 17,285
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   0.25%    
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 0 0
Loan Balance, maximum $ 250 250 250 $ 250
Number of Loans | loan 1,273     1,524
Total Principal $ 115,437 115,437 115,437 $ 146,100
30-89 Days DQ 3,189 3,189 3,189 4,208
90+ Days DQ 2,691 $ 2,691 2,691 $ 3,966
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   0.38%   0.25%
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   5.63%   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 206     251
Total Principal $ 71,306 71,306 71,306 $ 86,676
30-89 Days DQ 2,831 2,831 2,831 1,908
90+ Days DQ 2,124 $ 2,124 2,124 $ 4,392
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   0.75%   0.50%
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   3.88%   4.13%
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 68     79
Total Principal $ 42,128 42,128 42,128 $ 48,437
30-89 Days DQ 555 555 555 714
90+ Days DQ 1,842 $ 1,842 1,842 $ 1,192
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   0.25%   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   4.13%   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 15     27
Total Principal $ 12,868 12,868 12,868 $ 21,875
30-89 Days DQ 1,811 1,811 1,811 0
90+ Days DQ 825 $ 825 825 $ 3,175
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   0.75%   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   3.75%   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 12     18
Total Principal $ 18,668 18,668 18,668 $ 26,422
30-89 Days DQ 1,175 1,175 1,175 0
90+ Days DQ $ 0 $ 0 0 $ 4,560
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   0.88%   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   2.00%   2.38%
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 4,300     2,177
Total Principal $ 3,605,471 $ 3,605,471 3,605,471 $ 1,550,454
30-89 Days DQ 31,460 31,460 31,460 37,374
90+ Days DQ $ 15,124 15,124 15,124 $ 74,742
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 28     54
Total Principal $ 22,665 22,665 22,665 $ 43,644
30-89 Days DQ 191 191 191 2,082
90+ Days DQ 0 $ 0 0 2,415
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   3.13%    
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   6.75%    
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 2     3
Total Principal $ 397 397 397 $ 607
30-89 Days DQ 191 191 191 0
90+ Days DQ 0 $ 0 0 $ 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%   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%   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 3     5
Total Principal $ 1,354 1,354 1,354 $ 2,196
30-89 Days DQ 0 0 0 440
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   3.25%   3.50%
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     19
Total Principal $ 5,321 5,321 5,321 $ 12,214
30-89 Days DQ 0 0 0 682
90+ Days DQ 0 $ 0 0 $ 671
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%   3.25%
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%   4.75%
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 8     15
Total Principal $ 6,659 6,659 6,659 $ 12,911
30-89 Days DQ 0 0 0 960
90+ Days DQ 0 $ 0 0 $ 1,744
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   3.13%   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   5.00%   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 7     12
Total Principal $ 8,934 8,934 8,934 $ 15,716
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   3.50%   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 4,272     2,123
Total Principal $ 3,582,806 $ 3,582,806 3,582,806 $ 1,506,810
30-89 Days DQ 31,269 31,269 31,269 35,292
90+ Days DQ 15,124 $ 15,124 15,124 72,327
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 43     48
Total Principal $ 8,630 8,630 8,630 $ 9,508
30-89 Days DQ 0 0 0 0
90+ Days DQ 0 $ 0 0 $ 191
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   2.75%   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   5.13%   5.50%
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 162     285
Total Principal $ 69,442 69,442 69,442 $ 122,327
30-89 Days DQ 2,390 2,390 2,390 4,728
90+ Days DQ 462 $ 462 462 $ 2,225
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   2.50%   3.13%
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   6.13%   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 1,691     1,004
Total Principal $ 1,093,766 1,093,766 1,093,766 $ 617,488
30-89 Days DQ 10,894 10,894 10,894 15,214
90+ Days DQ 3,498 $ 3,498 3,498 $ 24,842
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%   3.00%
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   6.75%   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 1,497     556
Total Principal $ 1,311,640 1,311,640 1,311,640 $ 478,938
30-89 Days DQ 9,477 9,477 9,477 10,482
90+ Days DQ 4,931 $ 4,931 4,931 $ 21,155
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%   3.25%
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   6.25%   6.50%
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 879     230
Total Principal $ 1,099,328 1,099,328 1,099,328 $ 278,549
30-89 Days DQ 8,508 8,508 8,508 4,868
90+ Days DQ $ 6,233 $ 6,233 6,233 $ 23,914
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%   3.15%
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(1) | 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
Number of Loans | loan       1
Total Principal       $ 1,012
30-89 Days DQ       1,012
90+ Days DQ       $ 0
Freddie Mac SLST(1) | 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       4.00%
Freddie Mac SLST(1) | 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       4.00%
Freddie Mac SLST(1) | 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 11,986     13,605
Total Principal $ 1,932,241 $ 1,932,241 1,932,241 $ 2,247,771
30-89 Days DQ 341,046 341,046 341,046 434,815
90+ Days DQ 212,961 $ 212,961 212,961 $ 389,245
Freddie Mac SLST(1) | 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(1) | 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(1) | 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  
Loan Balance, maximum $ 250 250 250  
Number of Loans | loan 9,798     11,007
Total Principal $ 1,224,173 1,224,173 1,224,173 $ 1,407,107
30-89 Days DQ 222,541 222,541 222,541 283,745
90+ Days DQ 114,622 $ 114,622 114,622 $ 206,724
Freddie Mac SLST(1) | 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(1) | 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(1) | 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 2,141     2,545
Total Principal $ 681,885 681,885 681,885 $ 811,191
30-89 Days DQ 114,360 114,360 114,360 143,195
90+ Days DQ 91,149 $ 91,149 91,149 $ 172,995
Freddie Mac SLST(1) | 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(1) | 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(1) | 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 46     52
Total Principal $ 25,165 25,165 25,165 $ 28,461
30-89 Days DQ 3,127 3,127 3,127 6,863
90+ Days DQ 7,190 $ 7,190 7,190 $ 9,526
Freddie Mac SLST(1) | 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(1) | 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%   6.75%
Freddie Mac SLST(1) | 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  
Number of Loans | loan 1      
Total Principal $ 1,018 1,018 1,018  
30-89 Days DQ 1,018 1,018 1,018  
90+ Days DQ $ 0 $ 0 $ 0  
Freddie Mac SLST(1) | 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(1) | 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%