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Business Purpose Loans - Product Types and Characteristics of Business Purpose Loans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [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
Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan | 65 | 201
Total Principal | $ 234,475 | $ 321,637
30-89 Days DQ | 0 | 0
90+ Days DQ | 7,127 | $ 1,818
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 | 8 | 85
Total Principal | $ 1,060 | $ 10,506
30-89 Days DQ | 0 | 0
90+ Days DQ | $ 635 | $ 130
Single-family rental loans | $0 to $250 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 6.25% | 5.50%
Single-family rental loans | $0 to $250 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 7.75% | 7.63%
Single-family rental loans | $251 to $500 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum | $ 251 | $ 251
Loan Balance, maximum | $ 500 | $ 500
Number of Loans | loan | 1 | 9
Total Principal | $ 483 | $ 3,708
30-89 Days DQ | 0 | 0
90+ Days DQ | $ 0 | $ 0
Single-family rental loans | $251 to $500 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 5.97% | 4.94%
Single-family rental loans | $251 to $500 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 5.97% | 6.00%
Single-family rental loans | $501 to $750 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum | $ 501 | $ 501
Loan Balance, maximum | $ 750 | $ 750
Number of Loans | loan | 6 | 21
Total Principal | $ 3,632 | $ 13,335
30-89 Days DQ | 0 | 0
90+ Days DQ | $ 0 | $ 0
Single-family rental loans | $501 to $750 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 5.84% | 4.55%
Single-family rental loans | $501 to $750 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 6.75% | 5.96%
Single-family rental loans | $751 to $1,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum | $ 751 | $ 751
Loan Balance, maximum | $ 1,000 | $ 1,000
Number of Loans | loan | 10 | 13
Total Principal | $ 8,936 | $ 11,676
30-89 Days DQ | 0 | 0
90+ Days DQ | $ 1,815 | $ 0
Single-family rental loans | $751 to $1,000 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 5.15% | 5.00%
Single-family rental loans | $751 to $1,000 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 6.39% | 5.93%
Single-family rental loans | Over $1,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, maximum | $ 1,000 | $ 1,000
Number of Loans | loan | 40 | 73
Total Principal | $ 220,364 | $ 282,412
30-89 Days DQ | 0 | 0
90+ Days DQ | $ 4,677 | $ 1,688
Single-family rental loans | Over $1,000 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 3.82% | 4.35%
Single-family rental loans | Over $1,000 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 5.95% | 6.28%
Bridge loans held-for-investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan | 1,725 | 2,653
Total Principal | $ 649,532 | $ 741,232
30-89 Days DQ | 7,475 | 39,553
90+ Days DQ | 39,415 | 8,987
Bridge loans held-for-investment | $0 to $250 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum | 0 | 0
Loan Balance, maximum | $ 250 | $ 250
Number of Loans | loan | 1,440 | 2,207
Total Principal | $ 128,596 | $ 197,449
30-89 Days DQ | 6,530 | 1,447
90+ Days DQ | $ 1,668 | $ 369
Bridge loans held-for-investment | $0 to $250 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 5.75% | 6.53%
Bridge loans held-for-investment | $0 to $250 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 12.00% | 12.00%
Bridge loans held-for-investment | $251 to $500 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum | $ 251 | $ 251
Loan Balance, maximum | $ 500 | $ 500
Number of Loans | loan | 110 | 198
Total Principal | $ 37,607 | $ 71,361
30-89 Days DQ | 945 | 2,811
90+ Days DQ | $ 1,423 | $ 675
Bridge loans held-for-investment | $251 to $500 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 6.65% | 6.99%
Bridge loans held-for-investment | $251 to $500 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 13.00% | 13.00%
Bridge loans held-for-investment | $501 to $750 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum | $ 501 | $ 501
Loan Balance, maximum | $ 750 | $ 750
Number of Loans | loan | 39 | 71
Total Principal | $ 23,783 | $ 42,862
30-89 Days DQ | 0 | 2,072
90+ Days DQ | $ 540 | $ 508
Bridge loans held-for-investment | $501 to $750 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 6.99% | 6.99%
Bridge loans held-for-investment | $501 to $750 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 10.00% | 9.99%
Bridge loans held-for-investment | $751 to $1,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum | $ 751 | $ 751
Loan Balance, maximum | $ 1,000 | $ 1,000
Number of Loans | loan | 21 | 40
Total Principal | $ 18,225 | $ 34,646
30-89 Days DQ | 0 | 1,771
90+ Days DQ | $ 943 | $ 2,443
Bridge loans held-for-investment | $751 to $1,000 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 6.50% | 7.28%
Bridge loans held-for-investment | $751 to $1,000 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 9.50% | 10.00%
Bridge loans held-for-investment | Over $1,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, maximum | $ 1,000 | $ 1,000
Number of Loans | loan | 115 | 137
Total Principal | $ 441,321 | $ 394,914
30-89 Days DQ | 0 | 31,452
90+ Days DQ | $ 34,841 | $ 4,992
Bridge loans held-for-investment | Over $1,000 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 6.04% | 5.79%
Bridge loans held-for-investment | Over $1,000 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 10.25% | 10.25%
Redwood | Single-family rental loans held-for-investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan |  | 107
Total Principal |  | $ 231,211
30-89 Days DQ |  | 0
90+ Days DQ |  | $ 0
Redwood | Single-family rental loans held-for-investment | $251 to $500 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan |  | 20
Total Principal |  | $ 7,925
30-89 Days DQ |  | 0
90+ Days DQ |  | $ 0
Redwood | Single-family rental loans held-for-investment | $251 to $500 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate |  | 4.88%
Redwood | Single-family rental loans held-for-investment | $251 to $500 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate |  | 7.47%
Redwood | Single-family rental loans held-for-investment | $501 to $750 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan |  | 26
Total Principal |  | $ 15,620
30-89 Days DQ |  | 0
90+ Days DQ |  | $ 0
Redwood | Single-family rental loans held-for-investment | $501 to $750 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate |  | 4.45%
Redwood | Single-family rental loans held-for-investment | $501 to $750 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate |  | 7.25%
Redwood | Single-family rental loans held-for-investment | $751 to $1,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan |  | 16
Total Principal |  | $ 13,616
30-89 Days DQ |  | 0
90+ Days DQ |  | $ 0
Redwood | Single-family rental loans held-for-investment | $751 to $1,000 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate |  | 4.91%
Redwood | Single-family rental loans held-for-investment | $751 to $1,000 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate |  | 6.58%
Redwood | Single-family rental loans held-for-investment | Over $1,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan |  | 45
Total Principal |  | $ 194,050
30-89 Days DQ |  | 0
90+ Days DQ |  | $ 0
Redwood | Single-family rental loans held-for-investment | Over $1,000 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate |  | 3.93%
Redwood | Single-family rental loans held-for-investment | Over $1,000 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate |  | 6.94%
CAFL | Single-family rental loans held-for-investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan | 1,094 | 783
Total Principal | $ 3,017,137 | $ 2,078,214
30-89 Days DQ | 4,631 | 22,771
90+ Days DQ | 61,440 | $ 29,039
CAFL | Single-family rental loans held-for-investment | $0 to $250 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum | 0 |
Loan Balance, maximum | $ 250 |
Number of Loans | loan | 5 | 2
Total Principal | $ 1,016 | $ 398
30-89 Days DQ | 0 | 0
90+ Days DQ | $ 0 | $ 0
CAFL | Single-family rental loans held-for-investment | $0 to $250 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 5.77% | 5.46%
CAFL | Single-family rental loans held-for-investment | $0 to $250 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 7.05% | 5.80%
CAFL | Single-family rental loans held-for-investment | $251 to $500 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum | $ 251 |
Loan Balance, maximum | $ 500 |
Number of Loans | loan | 67 | 56
Total Principal | $ 29,977 | $ 25,643
30-89 Days DQ | 0 | 1,306
90+ Days DQ | $ 0 | $ 0
CAFL | Single-family rental loans held-for-investment | $251 to $500 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 4.64% | 4.92%
CAFL | Single-family rental loans held-for-investment | $251 to $500 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 6.96% | 7.05%
CAFL | Single-family rental loans held-for-investment | $501 to $750 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum | $ 501 |
Loan Balance, maximum | $ 750 |
Number of Loans | loan | 212 | 148
Total Principal | $ 130,665 | $ 91,414
30-89 Days DQ | 0 | 1,259
90+ Days DQ | $ 1,752 | $ 1,990
CAFL | Single-family rental loans held-for-investment | $501 to $750 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 4.12% | 4.75%
CAFL | Single-family rental loans held-for-investment | $501 to $750 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 7.06% | 7.31%
CAFL | Single-family rental loans held-for-investment | $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 | 131 | 98
Total Principal | $ 113,874 | $ 85,472
30-89 Days DQ | 764 | 1,639
90+ Days DQ | $ 750 | $ 879
CAFL | Single-family rental loans held-for-investment | $751 to $1,000 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 4.33% | 4.62%
CAFL | Single-family rental loans held-for-investment | $751 to $1,000 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 7.23% | 7.23%
CAFL | Single-family rental loans held-for-investment | Over $1,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, maximum | $ 1,000 |
Number of Loans | loan | 679 | 479
Total Principal | $ 2,741,605 | $ 1,875,287
30-89 Days DQ | 3,867 | 18,567
90+ Days DQ | $ 58,938 | $ 26,170
CAFL | Single-family rental loans held-for-investment | Over $1,000 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 3.93% | 4.31%
CAFL | Single-family rental loans held-for-investment | Over $1,000 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 7.57% | 7.57%

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