Residential Loans - Loan Product Type and Accompanying Loan Characteristics of Residential Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) loan	Dec. 31, 2017 USD ($) Contract	Dec. 31, 2016 USD ($) loan
Residential loans, held-for-investment
Mortgage Loans on Real Estate [Line Items]
90 Days DQ	$ 25,457	$ 25,457	$ 25,457
Residential loans, held-for-investment | Fixed Loans | Over $1,000 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.00%
Residential Loans Held For Sale
Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan		2,013		1,121
Total Principal	$ 1,409,179	$ 1,409,179	1,409,179	$ 833,385
30-89 Days DQ	1,913	1,913	1,913	0
90 Days DQ	459	459	459	300
Residential Loans Held For Sale | Hybrid ARM Loans
Mortgage Loans on Real Estate [Line Items]
Loan Balance, minimum	443	443	443	2
Loan Balance, maximum	2,000	$ 2,000	2,000	$ 1,947
Number of Loans | loan		93		173
Total Principal	78,884	$ 78,884	78,884	$ 144,174
30-89 Days DQ	0	0	0	0
90 Days DQ	$ 0	0	0	$ 0
Residential Loans Held For Sale | Hybrid ARM Loans | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.88%			2.50%
Residential Loans Held For Sale | Hybrid ARM Loans | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.00%			6.00%
Residential Loans Held For Sale | Fixed Loans
Mortgage Loans on Real Estate [Line Items]
Loan Balance, minimum	$ 132	132	132	$ 404
Loan Balance, maximum	1,950	$ 1,950	1,950	$ 1,997
Number of Loans | loan		1,917		942
Total Principal	1,329,851	$ 1,329,851	1,329,851	$ 688,329
30-89 Days DQ	1,913	1,913	1,913	0
90 Days DQ	$ 459	459	459	$ 0
Residential Loans Held For Sale | Fixed Loans | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.88%			2.99%
Residential Loans Held For Sale | Fixed Loans | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.25%			6.25%
Residential Loans Held For Sale | ARM Loans
Mortgage Loans on Real Estate [Line Items]
Loan Balance, minimum	$ 58	58	58	$ 61
Loan Balance, maximum	290	$ 290	290	$ 396
Number of Loans | loan		3		6
Total Principal	444	$ 444	444	$ 882
30-89 Days DQ	0	0	0	0
90 Days DQ	$ 0	$ 0	0	$ 300
Residential Loans Held For Sale | ARM Loans | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	1.50%			1.88%
Residential Loans Held For Sale | ARM Loans | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.00%			2.75%
Legacy Sequoia | Residential loans, held-for-investment
Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan		3,178		3,735
Total Principal	$ 697,922	$ 697,922	697,922	$ 886,981
30-89 Days DQ	20,303	20,303	20,303	32,356
90 Days DQ	25,457	$ 25,457	25,457	$ 30,166
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans
Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan		33		37
Total Principal	15,211	$ 15,211	15,211	$ 17,691
30-89 Days DQ	0	0	0	669
90 Days DQ	$ 641	641	641	0
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.63%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.75%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $0 to $250
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		4		4
Total Principal	530	$ 530	530	$ 453
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
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.25%			3.00%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $0 to $250 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.75%			3.00%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $251 to $500
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		17		18
Total Principal	6,170	$ 6,170	6,170	$ 6,516
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
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.63%			2.63%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $251 to $500 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.75%			3.13%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $501 to $750
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		11		13
Total Principal	7,091	$ 7,091	7,091	$ 8,483
30-89 Days DQ	0	0	0	669
90 Days DQ	$ 641	641	641	$ 0
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $501 to $750 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.38%			2.75%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $501 to $750 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.75%			3.13%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $751 to $1,000
Mortgage Loans on Real Estate [Line Items]
Loan Balance, minimum				$ 751
Loan Balance, maximum				$ 1,000
Number of Loans | loan				1
Total Principal				$ 751
30-89 Days DQ				0
90 Days DQ				$ 0
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $751 to $1,000 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate				3.13%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | $751 to $1,000 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate				3.13%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | Over $1,000
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	1,420	$ 1,420	1,420	$ 1,488
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
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.75%			3.00%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM Loans | Over $1,000 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.75%			3.00%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans
Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan		3,145		3,698
Total Principal	$ 682,711	$ 682,711	682,711	$ 869,290
30-89 Days DQ	20,303	20,303	20,303	31,687
90 Days DQ	$ 24,816	24,816	24,816	30,166
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	1.00%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.63%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $0 to $250
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		2,324		2,623
Total Principal	253,438	$ 253,438	253,438	$ 297,646
30-89 Days DQ	7,436	7,436	7,436	9,158
90 Days DQ	$ 7,284	7,284	7,284	$ 7,410
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $0 to $250 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	1.25%			0.63%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $0 to $250 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.16%			5.60%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $251 to $500
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		541		694
Total Principal	189,360	$ 189,360	189,360	$ 241,253
30-89 Days DQ	9,082	9,082	9,082	9,177
90 Days DQ	$ 9,178	9,178	9,178	$ 10,059
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $251 to $500 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	1.00%			0.25%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $251 to $500 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.63%			5.75%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $501 to $750
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		151		203
Total Principal	91,244	$ 91,244	91,244	$ 121,919
30-89 Days DQ	1,995	1,995	1,995	5,812
90 Days DQ	$ 2,589	2,589	2,589	$ 5,069
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $501 to $750 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	1.63%			0.88%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $501 to $750 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.00%			3.89%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $751 to $1,000
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		76		100
Total Principal	65,276	$ 65,276	65,276	$ 86,988
30-89 Days DQ	1,790	1,790	1,790	2,750
90 Days DQ	$ 1,725	1,725	1,725	$ 3,322
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $751 to $1,000 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	1.38%			0.63%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | $751 to $1,000 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.38%			3.00%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | Over $1,000
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		53		78
Total Principal	83,393	$ 83,393	83,393	$ 121,484
30-89 Days DQ	0	0	0	4,790
90 Days DQ	$ 4,040	$ 4,040	$ 4,040	$ 4,306
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | Over $1,000 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	1.00%			0.25%
Legacy Sequoia | Residential loans, held-for-investment | ARM Loans | Over $1,000 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.63%			3.75%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans
Mortgage Loans on Real Estate [Line Items]
Number of Loans		806	806
Total Principal	$ 604,747	$ 604,747	$ 604,747
30-89 Days DQ	1,158	1,158	1,158
90 Days DQ	$ 0	0	0
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.75%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.50%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $0 to $250
Mortgage Loans on Real Estate [Line Items]
Loan Balance, minimum	$ 0	0	0
Loan Balance, maximum	250	250	$ 250
Number of Loans | Contract			4
Total Principal	641	641	$ 641
30-89 Days DQ	0	0	0
90 Days DQ	$ 0	0	0
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $0 to $250 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.75%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $0 to $250 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.75%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $251 to $500
Mortgage Loans on Real Estate [Line Items]
Loan Balance, minimum	$ 251	251	251
Loan Balance, maximum	500	500	$ 500
Number of Loans | Contract			85
Total Principal	38,900	38,900	$ 38,900
30-89 Days DQ	486	486	486
90 Days DQ	$ 0	0	0
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $251 to $500 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.13%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $251 to $500 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.75%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $501 to $750
Mortgage Loans on Real Estate [Line Items]
Loan Balance, minimum	$ 501	501	501
Loan Balance, maximum	750	750	$ 750
Number of Loans | Contract			388
Total Principal	240,538	240,538	$ 240,538
30-89 Days DQ	672	672	672
90 Days DQ	$ 0	0	0
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $501 to $750 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.13%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $501 to $750 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.25%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $751 to $1,000
Mortgage Loans on Real Estate [Line Items]
Loan Balance, minimum	$ 751	751	751
Loan Balance, maximum	1,000	1,000	$ 1,000
Number of Loans | Contract			239
Total Principal	210,235	210,235	$ 210,235
30-89 Days DQ	0	0	0
90 Days DQ	$ 0	0	0
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $751 to $1,000 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.25%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | $751 to $1,000 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.50%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | Over $1,000
Mortgage Loans on Real Estate [Line Items]
Loan Balance, maximum	$ 1,000	1,000	$ 1,000
Number of Loans | Contract			90
Total Principal	114,433	114,433	$ 114,433
30-89 Days DQ	0	0	0
90 Days DQ	$ 0	$ 0	0
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | Over $1,000 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.13%
Sequoia Choice | Residential loans, held-for-investment | Fixed Loans | Over $1,000 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.88%
Redwood | Residential loans, held-for-investment
Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan		3,292		3,068
Total Principal	$ 2,407,993	$ 2,407,993	2,407,993	$ 2,233,797
30-89 Days DQ	10,978	10,978	10,978	4,299
90 Days DQ	0	$ 0	0	$ 237
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans
Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan		259		11
Total Principal	203,461	$ 203,461	203,461	$ 10,257
30-89 Days DQ	3,214	3,214	3,214	0
90 Days DQ	$ 0	0	0	0
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.63%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.00%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $0 to $250
Mortgage Loans on Real Estate [Line Items]
Loan Balance, minimum	$ 0	0	0
Loan Balance, maximum	250	$ 250	250
Number of Loans | loan		7
Total Principal	1,589	$ 1,589	1,589
30-89 Days DQ	438	438	438
90 Days DQ	$ 0	0	0
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $0 to $250 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.50%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $0 to $250 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.88%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $251 to $500
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		43		1
Total Principal	16,703	$ 16,703	16,703	$ 264
30-89 Days DQ	566	566	566	0
90 Days DQ	$ 0	0	0	$ 0
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $251 to $500 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.63%			3.63%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $251 to $500 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.88%			3.63%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $501 to $750
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		87		4
Total Principal	55,709	$ 55,709	55,709	$ 2,722
30-89 Days DQ	1,226	1,226	1,226	0
90 Days DQ	$ 0	0	0	$ 0
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $501 to $750 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.88%			2.88%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $501 to $750 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.13%			4.65%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $751 to $1,000
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		82		2
Total Principal	71,819	$ 71,819	71,819	$ 1,726
30-89 Days DQ	984	984	984	0
90 Days DQ	$ 0	0	0	$ 0
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $751 to $1,000 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.88%			3.50%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | $751 to $1,000 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.00%			4.00%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | Over $1,000
Mortgage Loans on Real Estate [Line Items]
Loan Balance, maximum	$ 1,000	$ 1,000	1,000	$ 1,000
Number of Loans | loan		40		4
Total Principal	57,641	$ 57,641	57,641	$ 5,545
30-89 Days DQ	0	0	0	0
90 Days DQ	$ 0	$ 0	0	$ 0
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | Over $1,000 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.00%			3.00%
Redwood | Residential loans, held-for-investment | Hybrid ARM Loans | Over $1,000 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.00%			4.20%
Redwood | Residential loans, held-for-investment | Fixed Loans
Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan		3,033		3,057
Total Principal	$ 2,204,532	$ 2,204,532	2,204,532	$ 2,223,540
30-89 Days DQ	7,764	7,764	7,764	4,299
90 Days DQ	$ 0	0	0	237
Redwood | Residential loans, held-for-investment | Fixed Loans | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.75%
Redwood | Residential loans, held-for-investment | Fixed Loans | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.75%
Redwood | Residential loans, held-for-investment | Fixed Loans | $0 to $250
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		34		26
Total Principal	6,758	$ 6,758	6,758	$ 4,643
30-89 Days DQ	0	0	0	0
90 Days DQ	$ 0	0	0	$ 237
Redwood | Residential loans, held-for-investment | Fixed Loans | $0 to $250 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.13%			3.67%
Redwood | Residential loans, held-for-investment | Fixed Loans | $0 to $250 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.08%			5.08%
Redwood | Residential loans, held-for-investment | Fixed Loans | $251 to $500
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		681		633
Total Principal	296,950	$ 296,950	296,950	$ 278,560
30-89 Days DQ	1,380	1,380	1,380	264
90 Days DQ	$ 0	0	0	$ 0
Redwood | Residential loans, held-for-investment | Fixed Loans | $251 to $500 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.80%			2.80%
Redwood | Residential loans, held-for-investment | Fixed Loans | $251 to $500 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.13%			5.13%
Redwood | Residential loans, held-for-investment | Fixed Loans | $501 to $750
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		1,261		1,306
Total Principal	777,103	$ 777,103	777,103	$ 807,714
30-89 Days DQ	3,818	3,818	3,818	2,803
90 Days DQ	$ 0	0	0	$ 0
Redwood | Residential loans, held-for-investment | Fixed Loans | $501 to $750 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.75%			2.75%
Redwood | Residential loans, held-for-investment | Fixed Loans | $501 to $750 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.75%			6.25%
Redwood | Residential loans, held-for-investment | Fixed Loans | $751 to $1,000
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		649		690
Total Principal	559,426	$ 559,426	559,426	$ 597,002
30-89 Days DQ	2,566	2,566	2,566	0
90 Days DQ	$ 0	0	0	$ 0
Redwood | Residential loans, held-for-investment | Fixed Loans | $751 to $1,000 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.75%			2.75%
Redwood | Residential loans, held-for-investment | Fixed Loans | $751 to $1,000 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.00%			5.63%
Redwood | Residential loans, held-for-investment | Fixed Loans | Over $1,000
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		408		402
Total Principal	564,295	$ 564,295	564,295	$ 535,621
30-89 Days DQ	0	0	0	1,232
90 Days DQ	$ 0	$ 0	$ 0	$ 0
Redwood | Residential loans, held-for-investment | Fixed Loans | Over $1,000 | Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.80%			2.80%
Redwood | Residential loans, held-for-investment | Fixed Loans | Over $1,000 | Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate				5.00%