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Business Purpose Loans - Product Types and Characteristics of Business Purpose Loans (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
loan
Dec. 31, 2021
USD ($)
loan
Single-family rental loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 91  
Total Principal $ 389,846  
30-89 Days DQ 550  
90+ Days DQ 536  
Single-family rental loans | $0 to $250    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum 0  
Loan Balance, maximum $ 250  
Number of Loans | loan 13  
Total Principal $ 1,682  
30-89 Days DQ 0  
90+ Days DQ $ 0  
Single-family rental loans | $0 to $250 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 4.25%  
Single-family rental loans | $0 to $250 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 7.88%  
Single-family rental loans | $251 to $500    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 251  
Loan Balance, maximum $ 500  
Number of Loans | loan 14  
Total Principal $ 5,014  
30-89 Days DQ 0  
90+ Days DQ $ 0  
Single-family rental loans | $251 to $500 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 5.00%  
Single-family rental loans | $251 to $500 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 7.74%  
Single-family rental loans | $501 to $750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 501  
Loan Balance, maximum $ 750  
Number of Loans | loan 11  
Total Principal $ 6,658  
30-89 Days DQ 550  
90+ Days DQ $ 536  
Single-family rental loans | $501 to $750 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 4.65%  
Single-family rental loans | $501 to $750 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 8.44%  
Single-family rental loans | $751 to $1,000    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 751  
Loan Balance, maximum $ 1,000  
Number of Loans | loan 4  
Total Principal $ 3,724  
30-89 Days DQ 0  
90+ Days DQ $ 0  
Single-family rental loans | $751 to $1,000 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 7.25%  
Single-family rental loans | $751 to $1,000 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 8.08%  
Single-family rental loans | Over $1,000    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, maximum $ 1,000  
Number of Loans | loan 49  
Total Principal $ 372,768  
30-89 Days DQ 0  
90+ Days DQ $ 0  
Single-family rental loans | Over $1,000 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 3.75%  
Single-family rental loans | Over $1,000 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 8.47%  
CAFL | Single family rental loans held for investment at fair value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 1,131 1,173
Total Principal $ 3,263,421 $ 3,340,949
30-89 Days DQ 72,574  
90+ Days DQ 39,483  
CAFL | Single family rental loans held for investment at fair value | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan   1,173
Total Principal   $ 3,340,949
30-89 Days DQ   28,472
90+ Days DQ   41,999
CAFL | Single family rental loans held for investment at fair value | $0 to $250    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum 0  
Loan Balance, maximum $ 250  
Number of Loans | loan 5  
Total Principal $ 588  
30-89 Days DQ 0  
90+ Days DQ $ 0  
CAFL | Single family rental loans held for investment at fair value | $0 to $250 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum   0
Loan Balance, maximum   $ 250
Number of Loans | loan   5
Total Principal   $ 398
30-89 Days DQ   20
90+ Days DQ   $ 0
CAFL | Single family rental loans held for investment at fair value | $0 to $250 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 4.54%  
CAFL | Single family rental loans held for investment at fair value | $0 to $250 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   5.77%
CAFL | Single family rental loans held for investment at fair value | $0 to $250 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.27%  
CAFL | Single family rental loans held for investment at fair value | $0 to $250 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   6.80%
CAFL | Single family rental loans held for investment at fair value | $251 to $500    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 251  
Loan Balance, maximum $ 500  
Number of Loans | loan 73  
Total Principal $ 31,725  
30-89 Days DQ 0  
90+ Days DQ $ 711  
CAFL | Single family rental loans held for investment at fair value | $251 to $500 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum   $ 251
Loan Balance, maximum   $ 500
Number of Loans | loan   73
Total Principal   $ 32,106
30-89 Days DQ   466
90+ Days DQ   $ 257
CAFL | Single family rental loans held for investment at fair value | $251 to $500 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 4.00%  
CAFL | Single family rental loans held for investment at fair value | $251 to $500 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   4.64%
CAFL | Single family rental loans held for investment at fair value | $251 to $500 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 7.06%  
CAFL | Single family rental loans held for investment at fair value | $251 to $500 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   7.03%
CAFL | Single family rental loans held for investment at fair value | $501 to $750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 501  
Loan Balance, maximum $ 750  
Number of Loans | loan 181  
Total Principal $ 112,413  
30-89 Days DQ 2,025  
90+ Days DQ $ 1,200  
CAFL | Single family rental loans held for investment at fair value | $501 to $750 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum   $ 501
Loan Balance, maximum   $ 750
Number of Loans | loan   199
Total Principal   $ 123,685
30-89 Days DQ   717
90+ Days DQ   $ 1,224
CAFL | Single family rental loans held for investment at fair value | $501 to $750 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 4.12%  
CAFL | Single family rental loans held for investment at fair value | $501 to $750 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   4.00%
CAFL | Single family rental loans held for investment at fair value | $501 to $750 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 7.04%  
CAFL | Single family rental loans held for investment at fair value | $501 to $750 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   7.06%
CAFL | Single family rental loans held for investment at fair value | $751 to $1,000    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 751  
Loan Balance, maximum $ 1,000  
Number of Loans | loan 123  
Total Principal $ 107,097  
30-89 Days DQ 0  
90+ Days DQ $ 1,856  
CAFL | Single family rental loans held for investment at fair value | $751 to $1,000 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum   $ 751
Loan Balance, maximum   $ 1,000
Number of Loans | loan   134
Total Principal   $ 116,724
30-89 Days DQ   788
90+ Days DQ   $ 0
CAFL | Single family rental loans held for investment at fair value | $751 to $1,000 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 4.20%  
CAFL | Single family rental loans held for investment at fair value | $751 to $1,000 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   4.20%
CAFL | Single family rental loans held for investment at fair value | $751 to $1,000 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 7.23%  
CAFL | Single family rental loans held for investment at fair value | $751 to $1,000 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   7.23%
CAFL | Single family rental loans held for investment at fair value | Over $1,000    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, maximum $ 1,000  
Number of Loans | loan 749  
Total Principal $ 3,011,598  
30-89 Days DQ 70,549  
90+ Days DQ $ 35,716  
CAFL | Single family rental loans held for investment at fair value | Over $1,000 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, maximum   $ 1,000
Number of Loans | loan   762
Total Principal   $ 3,068,036
30-89 Days DQ   26,481
90+ Days DQ   $ 40,518
CAFL | Single family rental loans held for investment at fair value | Over $1,000 | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 3.81%  
CAFL | Single family rental loans held for investment at fair value | Over $1,000 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   3.81%
CAFL | Single family rental loans held for investment at fair value | Over $1,000 | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 7.57%  
CAFL | Single family rental loans held for investment at fair value | Over $1,000 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   7.57%
CAFL | Business purpose loans held-for-investment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 1,875 1,640
Total Principal $ 514,666 $ 274,617
30-89 Days DQ 5,688 3,426
90+ Days DQ $ 7,328 $ 0
CAFL | Business purpose loans held-for-investment | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 605 920
Total Principal $ 109,803 $ 135,878
30-89 Days DQ 1,700 0
90+ Days DQ $ 3,953 $ 0
CAFL | Business purpose loans held-for-investment | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 1,270 720
Total Principal $ 404,863 $ 138,739
30-89 Days DQ 3,988 3,426
90+ Days DQ 3,375 0
CAFL | Business purpose loans held-for-investment | $0 to $250 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum 0 0
Loan Balance, maximum $ 250 $ 250
Number of Loans | loan 513 808
Total Principal $ 44,865 $ 58,110
30-89 Days DQ 0 0
90+ Days DQ 193 0
CAFL | Business purpose loans held-for-investment | $0 to $250 | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum 0 0
Loan Balance, maximum $ 250 $ 250
Number of Loans | loan 1,064 681
Total Principal $ 131,492 $ 77,001
30-89 Days DQ 0 2,091
90+ Days DQ $ 2,040 $ 0
CAFL | Business purpose loans held-for-investment | $0 to $250 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.30% 5.45%
CAFL | Business purpose loans held-for-investment | $0 to $250 | Minimum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.12% 5.85%
CAFL | Business purpose loans held-for-investment | $0 to $250 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 11.24% 10.65%
CAFL | Business purpose loans held-for-investment | $0 to $250 | Maximum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 12.62% 10.50%
CAFL | Business purpose loans held-for-investment | $251 to $500 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 251 $ 251
Loan Balance, maximum $ 500 $ 500
Number of Loans | loan 55 70
Total Principal $ 17,677 $ 23,488
30-89 Days DQ 300 0
90+ Days DQ 0 0
CAFL | Business purpose loans held-for-investment | $251 to $500 | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum 251 251
Loan Balance, maximum $ 500 $ 500
Number of Loans | loan 112 13
Total Principal $ 32,706 $ 4,088
30-89 Days DQ 0 783
90+ Days DQ $ 783 $ 0
CAFL | Business purpose loans held-for-investment | $251 to $500 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.30% 5.95%
CAFL | Business purpose loans held-for-investment | $251 to $500 | Minimum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 8.12% 5.95%
CAFL | Business purpose loans held-for-investment | $251 to $500 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 10.99% 10.50%
CAFL | Business purpose loans held-for-investment | $251 to $500 | Maximum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 11.37% 8.35%
CAFL | Business purpose loans held-for-investment | $501 to $750 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 501 $ 501
Loan Balance, maximum $ 750 $ 750
Number of Loans | loan 15 24
Total Principal $ 8,969 $ 15,041
30-89 Days DQ 0 0
90+ Days DQ 0 0
CAFL | Business purpose loans held-for-investment | $501 to $750 | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum 501 501
Loan Balance, maximum $ 750 $ 750
Number of Loans | loan 19 5
Total Principal $ 11,595 $ 3,097
30-89 Days DQ 0 552
90+ Days DQ $ 552 $ 0
CAFL | Business purpose loans held-for-investment | $501 to $750 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.30% 5.95%
CAFL | Business purpose loans held-for-investment | $501 to $750 | Minimum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.92% 5.75%
CAFL | Business purpose loans held-for-investment | $501 to $750 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 10.49% 9.99%
CAFL | Business purpose loans held-for-investment | $501 to $750 | Maximum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 11.82% 8.50%
CAFL | Business purpose loans held-for-investment | $751 to $1,000 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 751 $ 751
Loan Balance, maximum $ 1,000 $ 1,000
Number of Loans | loan 7 7
Total Principal $ 6,152 $ 6,375
30-89 Days DQ 0 0
90+ Days DQ 0 0
CAFL | Business purpose loans held-for-investment | $751 to $1,000 | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum 751 751
Loan Balance, maximum $ 1,000 $ 1,000
Number of Loans | loan 9 3
Total Principal $ 7,570 $ 2,546
30-89 Days DQ 0 0
90+ Days DQ $ 0 $ 0
CAFL | Business purpose loans held-for-investment | $751 to $1,000 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.50% 5.45%
CAFL | Business purpose loans held-for-investment | $751 to $1,000 | Minimum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 9.87% 6.75%
CAFL | Business purpose loans held-for-investment | $751 to $1,000 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 9.50% 8.99%
CAFL | Business purpose loans held-for-investment | $751 to $1,000 | Maximum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 11.37% 7.25%
CAFL | Business purpose loans held-for-investment | Over $1,000 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, maximum $ 1,000 $ 1,000
Number of Loans | loan 15 11
Total Principal $ 32,140 $ 32,864
30-89 Days DQ 1,400 0
90+ Days DQ 3,760 0
CAFL | Business purpose loans held-for-investment | Over $1,000 | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, maximum $ 1,000 $ 1,000
Number of Loans | loan 66 18
Total Principal $ 221,500 $ 52,007
30-89 Days DQ 3,988 0
90+ Days DQ $ 0 $ 0
CAFL | Business purpose loans held-for-investment | Over $1,000 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.75% 6.25%
CAFL | Business purpose loans held-for-investment | Over $1,000 | Minimum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 8.77% 5.75%
CAFL | Business purpose loans held-for-investment | Over $1,000 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 9.99% 9.00%
CAFL | Business purpose loans held-for-investment | Over $1,000 | Maximum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 12.37% 10.00%
Redwood | Single-family rental loans | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan   245
Total Principal   $ 348,232
30-89 Days DQ   89
90+ Days DQ   5,384
Redwood | Single-family rental loans | $0 to $250 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum   0
Loan Balance, maximum   $ 250
Number of Loans | loan   74
Total Principal   $ 11,515
30-89 Days DQ   89
90+ Days DQ   $ 171
Redwood | Single-family rental loans | $0 to $250 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   3.75%
Redwood | Single-family rental loans | $0 to $250 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   7.75%
Redwood | Single-family rental loans | $251 to $500 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum   $ 251
Loan Balance, maximum   $ 500
Number of Loans | loan   57
Total Principal   $ 21,284
30-89 Days DQ   0
90+ Days DQ   $ 0
Redwood | Single-family rental loans | $251 to $500 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   3.75%
Redwood | Single-family rental loans | $251 to $500 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   6.50%
Redwood | Single-family rental loans | $501 to $750 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum   $ 501
Loan Balance, maximum   $ 750
Number of Loans | loan   28
Total Principal   $ 16,773
30-89 Days DQ   0
90+ Days DQ   $ 536
Redwood | Single-family rental loans | $501 to $750 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   3.75%
Redwood | Single-family rental loans | $501 to $750 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   6.70%
Redwood | Single-family rental loans | $751 to $1,000 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum   $ 751
Loan Balance, maximum   $ 1,000
Number of Loans | loan   12
Total Principal   $ 9,764
30-89 Days DQ   0
90+ Days DQ   $ 0
Redwood | Single-family rental loans | $751 to $1,000 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   4.13%
Redwood | Single-family rental loans | $751 to $1,000 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   5.43%
Redwood | Single-family rental loans | Over $1,000 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, maximum   $ 1,000
Number of Loans | loan   74
Total Principal   $ 288,896
30-89 Days DQ   0
90+ Days DQ   $ 4,677
Redwood | Single-family rental loans | Over $1,000 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   3.38%
Redwood | Single-family rental loans | Over $1,000 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate   7.15%
Redwood | BPL bridge loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 1,601 1,134
Total Principal $ 1,518,427 $ 670,392
30-89 Days DQ 1,240 17,393
90+ Days DQ $ 34,264 $ 18,032
Redwood | BPL bridge loans | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 261 187
Total Principal $ 105,178 $ 96,066
30-89 Days DQ 1,240 13,995
90+ Days DQ $ 33,392 $ 17,116
Redwood | BPL bridge loans | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 1,340 947
Total Principal $ 1,413,249 $ 574,326
30-89 Days DQ 0 3,398
90+ Days DQ 872 916
Redwood | BPL bridge loans | $0 to $250 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum 0 0
Loan Balance, maximum $ 250 $ 250
Number of Loans | loan 155 115
Total Principal $ 15,409 $ 12,850
30-89 Days DQ 1,240 426
90+ Days DQ 957 1,493
Redwood | BPL bridge loans | $0 to $250 | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum 0 0
Loan Balance, maximum $ 250 $ 250
Number of Loans | loan 1,086 737
Total Principal $ 114,604 $ 65,611
30-89 Days DQ 0 773
90+ Days DQ $ 872 $ 0
Redwood | BPL bridge loans | $0 to $250 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.25% 5.95%
Redwood | BPL bridge loans | $0 to $250 | Minimum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 9.37% 4.25%
Redwood | BPL bridge loans | $0 to $250 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 11.25% 12.00%
Redwood | BPL bridge loans | $0 to $250 | Maximum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 11.37% 10.00%
Redwood | BPL bridge loans | $251 to $500 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 251 $ 251
Loan Balance, maximum $ 500 $ 500
Number of Loans | loan 54 26
Total Principal $ 19,745 $ 9,294
30-89 Days DQ 0 253
90+ Days DQ 1,290 1,619
Redwood | BPL bridge loans | $251 to $500 | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum 251 251
Loan Balance, maximum $ 500 $ 500
Number of Loans | loan 116 123
Total Principal $ 45,290 $ 42,248
30-89 Days DQ 0 0
90+ Days DQ $ 0 $ 0
Redwood | BPL bridge loans | $251 to $500 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.00% 5.95%
Redwood | BPL bridge loans | $251 to $500 | Minimum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 9.37% 4.25%
Redwood | BPL bridge loans | $251 to $500 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 11.50% 10.00%
Redwood | BPL bridge loans | $251 to $500 | Maximum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 11.61% 8.25%
Redwood | BPL bridge loans | $501 to $750 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 501 $ 501
Loan Balance, maximum $ 750 $ 750
Number of Loans | loan 20 13
Total Principal $ 12,108 $ 8,498
30-89 Days DQ 0 637
90+ Days DQ 2,568 2,012
Redwood | BPL bridge loans | $501 to $750 | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum 501 501
Loan Balance, maximum $ 750 $ 750
Number of Loans | loan 8 9
Total Principal $ 4,699 $ 5,724
30-89 Days DQ 0 0
90+ Days DQ $ 0 $ 0
Redwood | BPL bridge loans | $501 to $750 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.50% 6.70%
Redwood | BPL bridge loans | $501 to $750 | Minimum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 9.37% 5.75%
Redwood | BPL bridge loans | $501 to $750 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 11.00% 10.00%
Redwood | BPL bridge loans | $501 to $750 | Maximum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 11.61% 8.60%
Redwood | BPL bridge loans | $751 to $1,000 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum $ 751 $ 751
Loan Balance, maximum $ 1,000 $ 1,000
Number of Loans | loan 7 9
Total Principal $ 6,375 $ 7,544
30-89 Days DQ 0 980
90+ Days DQ 980 0
Redwood | BPL bridge loans | $751 to $1,000 | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, minimum 751 751
Loan Balance, maximum $ 1,000 $ 1,000
Number of Loans | loan 3 12
Total Principal $ 2,754 $ 10,200
30-89 Days DQ 0 945
90+ Days DQ $ 0 $ 916
Redwood | BPL bridge loans | $751 to $1,000 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.95% 5.45%
Redwood | BPL bridge loans | $751 to $1,000 | Minimum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 9.37% 5.75%
Redwood | BPL bridge loans | $751 to $1,000 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 10.00% 10.00%
Redwood | BPL bridge loans | $751 to $1,000 | Maximum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 10.12% 7.50%
Redwood | BPL bridge loans | Over $1,000 | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, maximum $ 1,000 $ 1,000
Number of Loans | loan 25 24
Total Principal $ 51,541 $ 57,880
30-89 Days DQ 0 11,699
90+ Days DQ 27,597 11,992
Redwood | BPL bridge loans | Over $1,000 | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan Balance, maximum $ 1,000 $ 1,000
Number of Loans | loan 127 66
Total Principal $ 1,245,902 $ 450,543
30-89 Days DQ 0 1,680
90+ Days DQ $ 0 $ 0
Redwood | BPL bridge loans | Over $1,000 | Minimum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 6.95% 5.45%
Redwood | BPL bridge loans | Over $1,000 | Minimum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 8.27% 4.90%
Redwood | BPL bridge loans | Over $1,000 | Maximum | Fixed loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 10.00% 10.00%
Redwood | BPL bridge loans | Over $1,000 | Maximum | Floating Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 11.87% 9.50%