Residential Loans - Loan Product Type and Accompanying Loan Characteristics of Residential Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($) loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	198	669
Total Principal	$ 172,748	$ 524,928
30-89 Days DQ	3,362	1,650
90+ Days DQ	1,882	$ 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	481,272
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	$ 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 | loan	2	115
Total Principal	$ 1,019	$ 91,883
30-89 Days DQ	970	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	2.00%
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	4.38%
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
Loan Balance, maximum	$ 250	$ 250
Number of Loans | loan	1	7
Total Principal	$ 49	$ 1,254
30-89 Days DQ	0	0
90+ Days DQ	$ 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	2.00%	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	2.00%	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
Loan Balance, maximum		$ 500
Number of Loans | loan		1
Total Principal		$ 432
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		4.25%
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		4.25%
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
Loan Balance, maximum		$ 750
Number of Loans | loan		52
Total Principal		$ 33,611
30-89 Days DQ		0
90+ Days DQ		$ 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%
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%
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	1	33
Total Principal	$ 970	$ 28,573
30-89 Days DQ	970	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	4.38%	3.25%
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	4.38%	4.88%
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		22
Total Principal		$ 28,013
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		3.25%
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%
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	196	554
Total Principal	$ 171,729	$ 433,045
30-89 Days DQ	2,392	1,650
90+ Days DQ	$ 1,882	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	2.38%
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	5.50%
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	1	2
Total Principal	$ 219	$ 481
30-89 Days DQ	219	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	4.69%	3.88%
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	4.69%	7.13%
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
Loan Balance, maximum		$ 500
Number of Loans | loan		13
Total Principal		$ 6,234
30-89 Days DQ		0
90+ Days DQ		$ 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%
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%
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	75	301
Total Principal	$ 48,933	$ 186,251
30-89 Days DQ	1,127	0
90+ Days DQ	$ 0	$ 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	2.50%	3.20%
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	5.50%	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
Loan Balance, maximum	$ 1,000	$ 1,000
Number of Loans | loan	80	161
Total Principal	$ 71,137	$ 139,786
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	2.38%	3.50%
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	4.63%	6.50%
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	40	77
Total Principal	$ 51,440	$ 100,293
30-89 Days DQ	1,046	1,650
90+ Days DQ	$ 1,882	$ 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	2.38%	3.20%
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%	5.00%
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
Total Principal		$ 2,052,778
30-89 Days DQ		12,221
90+ Days DQ		$ 1,585
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
Total Principal		$ 227,399
30-89 Days DQ		4,576
90+ Days DQ		971
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
Loan Balance, maximum		$ 250
Number of Loans | loan		12
Total Principal		$ 2,423
30-89 Days DQ		0
90+ Days DQ		$ 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%
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%
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
Loan Balance, maximum		$ 500
Number of Loans | loan		51
Total Principal		$ 20,781
30-89 Days DQ		0
90+ Days DQ		$ 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%
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%
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
Loan Balance, maximum		$ 750
Number of Loans | loan		97
Total Principal		$ 61,708
30-89 Days DQ		1,364
90+ Days DQ		$ 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%
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%
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
Loan Balance, maximum		$ 1,000
Number of Loans | loan		90
Total Principal		$ 77,550
30-89 Days DQ		1,784
90+ Days DQ		$ 971
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%
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%
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
Number of Loans | loan		49
Total Principal		$ 64,937
30-89 Days DQ		1,428
90+ Days DQ		$ 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%
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%
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
Total Principal		$ 1,825,379
30-89 Days DQ		7,645
90+ Days DQ		614
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
Loan Balance, maximum		$ 250
Number of Loans | loan		38
Total Principal		$ 6,549
30-89 Days DQ		223
90+ Days DQ		$ 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%
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%
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
Loan Balance, maximum		$ 500
Number of Loans | loan		676
Total Principal		$ 287,984
30-89 Days DQ		0
90+ Days DQ		$ 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%
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%
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
Loan Balance, maximum		$ 750
Number of Loans | loan		1,091
Total Principal		$ 669,159
30-89 Days DQ		2,325
90+ Days DQ		$ 614
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%
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%
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
Loan Balance, maximum		$ 1,000
Number of Loans | loan		519
Total Principal		$ 447,499
30-89 Days DQ		1,895
90+ Days DQ		$ 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%
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%
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, maximum		$ 1,000
Number of Loans | loan		317
Total Principal		$ 414,188
30-89 Days DQ		3,202
90+ Days DQ		$ 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%
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%
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	1,908	2,198
Total Principal	$ 333,474	$ 424,829
30-89 Days DQ	7,240	15,739
90+ Days DQ	$ 17,285	$ 9,803
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	1,899	2,186
Total Principal	$ 329,510	$ 419,398
30-89 Days DQ	6,830	15,739
90+ Days DQ	$ 17,285	9,803
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
Loan Balance, maximum	$ 250	$ 250
Number of Loans | loan	1,524	1,685
Total Principal	$ 146,100	$ 169,230
30-89 Days DQ	4,208	5,135
90+ Days DQ	$ 3,966	$ 3,109
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	0.25%	1.38%
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	5.63%	6.00%
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	251	345
Total Principal	$ 86,676	$ 120,260
30-89 Days DQ	1,908	6,149
90+ Days DQ	$ 4,392	$ 3,835
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	0.50%	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	4.13%	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	79	87
Total Principal	$ 48,437	$ 53,811
30-89 Days DQ	714	3,628
90+ Days DQ	$ 1,192	$ 1,211
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%	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	4.13%	4.38%
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	27	45
Total Principal	$ 21,875	$ 37,756
30-89 Days DQ	0	827
90+ Days DQ	$ 3,175	$ 1,648
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%	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	3.75%	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	18	24
Total Principal	$ 26,422	$ 38,341
30-89 Days DQ	0	0
90+ Days DQ	$ 4,560	$ 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	1.00%	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	2.38%	4.00%
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	12
Total Principal	$ 3,964	$ 5,431
30-89 Days DQ	410	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	2.63%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM loans | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.00%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM loans | $0 to $250
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan Balance, minimum	$ 0	0
Loan Balance, maximum	$ 250	$ 250
Number of Loans | loan	2	2
Total Principal	$ 439	$ 465
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	2.63%	4.25%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM loans | $0 to $250 | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.63%	4.50%
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	5	7
Total Principal	$ 1,748	$ 2,494
30-89 Days DQ	410	0
90+ Days DQ	$ 0	$ 0
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM loans | $251 to $500 | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.63%	3.63%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM loans | $251 to $500 | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.00%	5.13%
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	1	2
Total Principal	$ 556	$ 1,181
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	2.75%	4.50%
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	2.75%	4.50%
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	$ 1,000
Number of Loans | loan	1	1
Total Principal	$ 1,221	$ 1,291
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	2.63%	4.50%
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%	4.50%
Sequoia Choice | 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	2,177
Total Principal	$ 1,550,454
30-89 Days DQ	37,374
90+ Days DQ	$ 74,742
Sequoia Choice | 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	54
Total Principal	$ 43,644
30-89 Days DQ	2,082
90+ Days DQ	$ 2,415
Sequoia Choice | 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 Choice | 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 Choice | 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	3
Total Principal	$ 607
30-89 Days DQ	0
90+ Days DQ	$ 0
Sequoia Choice | 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 Choice | 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 Choice | 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
Loan Balance, maximum	$ 500
Number of Loans | loan	5
Total Principal	$ 2,196
30-89 Days DQ	440
90+ Days DQ	$ 0
Sequoia Choice | 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%
Sequoia Choice | 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%
Sequoia Choice | 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	19
Total Principal	$ 12,214
30-89 Days DQ	682
90+ Days DQ	$ 671
Sequoia Choice | 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	3.25%
Sequoia Choice | 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	4.75%
Sequoia Choice | 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
Loan Balance, maximum	$ 1,000
Number of Loans | loan	15
Total Principal	$ 12,911
30-89 Days DQ	960
90+ Days DQ	$ 1,744
Sequoia Choice | 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%
Sequoia Choice | 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%
Sequoia Choice | 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
Number of Loans | loan	12
Total Principal	$ 15,716
30-89 Days DQ	0
90+ Days DQ	$ 0
Sequoia Choice | 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%
Sequoia Choice | 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%
Sequoia Choice | Residential loans, held-for-investment | Fixed loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	2,123	3,156
Total Principal	$ 1,506,810	$ 2,240,679
30-89 Days DQ	35,292	24,266
90+ Days DQ	$ 72,327	6,755
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	48	56
Total Principal	$ 9,508	$ 10,743
30-89 Days DQ	0	0
90+ Days DQ	$ 191	$ 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%	5.50%
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	285	420
Total Principal	$ 122,327	$ 184,455
30-89 Days DQ	4,728	2,282
90+ Days DQ	$ 2,225	$ 0
Sequoia Choice | Residential loans, held-for-investment | Fixed loans | $251 to $500 | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.13%	3.13%
Sequoia Choice | Residential loans, held-for-investment | Fixed loans | $251 to $500 | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.13%	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	1,004	1,528
Total Principal	$ 617,488	$ 940,914
30-89 Days DQ	15,214	13,020
90+ Days DQ	$ 24,842	$ 2,366
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	3.00%	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%	6.75%
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	556	835
Total Principal	$ 478,938	$ 719,609
30-89 Days DQ	10,482	7,856
90+ Days DQ	$ 21,155	$ 3,297
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	230	317
Total Principal	$ 278,549	$ 384,958
30-89 Days DQ	4,868	1,108
90+ Days DQ	$ 23,914	$ 1,092
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	3.15%	3.50%
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	13,605	14,502
Total Principal	$ 2,247,771	$ 2,428,035
30-89 Days DQ	434,815	785,132
90+ Days DQ	$ 389,245	$ 135,175
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
Loan Balance, maximum	$ 250
Number of Loans | loan	11,007	11,639
Total Principal	$ 1,407,107	$ 1,501,538
30-89 Days DQ	283,745	477,592
90+ Days DQ	$ 206,724	$ 79,632
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
Loan Balance, maximum	$ 500	$ 500
Number of Loans | loan	2,545	2,805
Total Principal	$ 811,191	$ 894,126
30-89 Days DQ	143,195	297,732
90+ Days DQ	$ 172,995	$ 52,920
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
Loan Balance, maximum	$ 750	$ 750
Number of Loans | loan	52	57
Total Principal	$ 28,461	$ 31,350
30-89 Days DQ	6,863	8,787
90+ Days DQ	$ 9,526	$ 2,623
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%	6.75%
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	$ 1,012
30-89 Days DQ	1,012
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%
Freddie Mac SLST | 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		$ 1,021
30-89 Days DQ		1,021
90+ Days DQ		$ 0
Freddie Mac SLST | 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 | 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%