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Business Purpose Residential Loans - Product Types and Characteristics of Business Purpose Loans (Details) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | loan |  |  | 669 | 1,484
Total Principal | $ 524,928 | $ 1,034,284 | $ 524,928 | $ 1,034,284
30-89 Days DQ | 1,650 | 559 | 1,650 | 559
90 Days DQ | $ 747 | $ 747 | $ 747 | $ 747
Single-family rental loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | loan | 201 | 11 | 201 | 11
Total Principal | $ 321,636 | $ 27,566 | $ 321,636 | $ 27,566
30-89 Days DQ | 0 | 0 | 0 | 0
90 Days DQ | 1,818 | 0 | 1,818 | 0
Single-family rental loans | $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 |  |  | 85 |
Total Principal | 10,506 |  | $ 10,506 |
30-89 Days DQ | 0 |  | 0 |
90 Days DQ | 130 |  | $ 130 |
Single-family rental loans | $0 to $250 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 5.50% |
Single-family rental loans | $0 to $250 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 7.63% |
Single-family rental loans | $251 to $500 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance, minimum | 251 | 251 | $ 251 | 251
Loan Balance, maximum | 500 | 500 | $ 500 | $ 500
Number of Loans | loan |  |  | 9 | 2
Total Principal | 3,708 | 787 | $ 3,708 | $ 787
30-89 Days DQ | 0 | 0 | 0 | 0
90 Days DQ | 0 | 0 | $ 0 | $ 0
Single-family rental loans | $251 to $500 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 4.94% | 6.79%
Single-family rental loans | $251 to $500 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 6.00% | 7.47%
Single-family rental loans | $501 to $750 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance, minimum | 501 | 501 | $ 501 | $ 501
Loan Balance, maximum | 750 | 750 | $ 750 | $ 750
Number of Loans | loan |  |  | 21 | 2
Total Principal | 13,335 | 1,252 | $ 13,335 | $ 1,252
30-89 Days DQ | 0 | 0 | 0 | 0
90 Days DQ | 0 | 0 | $ 0 | $ 0
Single-family rental loans | $501 to $750 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 4.55% | 6.12%
Single-family rental loans | $501 to $750 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 5.96% | 7.25%
Single-family rental loans | $751 to $1,000 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance, minimum | 751 | 751 | $ 751 | $ 751
Loan Balance, maximum | 1,000 | 1,000 | $ 1,000 | $ 1,000
Number of Loans | loan |  |  | 13 | 3
Total Principal | 11,676 | 2,488 | $ 11,676 | $ 2,488
30-89 Days DQ | 0 | 0 | 0 | 0
90 Days DQ | 0 | 0 | $ 0 | $ 0
Single-family rental loans | $751 to $1,000 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 5.00% | 5.91%
Single-family rental loans | $751 to $1,000 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 5.93% | 6.58%
Single-family rental loans | Over $1,000 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance, maximum | 1,000 | 1,000 | $ 1,000 | $ 1,000
Number of Loans | loan |  |  | 73 | 4
Total Principal | 282,411 | 23,039 | $ 282,411 | $ 23,039
30-89 Days DQ | 0 | 0 | 0 | 0
90 Days DQ | $ 1,688 | $ 0 | $ 1,688 | $ 0
Single-family rental loans | Over $1,000 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 4.35% | 5.62%
Single-family rental loans | Over $1,000 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 6.28% | 6.94%
Residential bridge loans held-for-investment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | loan | 2,653 | 157 | 2,653 | 157
Total Principal | $ 741,232 | $ 112,360 | $ 741,232 | $ 112,360
30-89 Days DQ | 39,553 | 4,991 | 39,553 | 4,991
90 Days DQ | 8,989 | 12,134 | 8,989 | 12,134
Residential bridge loans held-for-investment | $0 to $250 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance, minimum | 0 | 0 | 0 | 0
Loan Balance, maximum | 250 | 250 | $ 250 | $ 250
Number of Loans | loan |  |  | 2,207 | 50
Total Principal | 197,449 | 7,941 | $ 197,449 | $ 7,941
30-89 Days DQ | 1,447 | 262 | 1,447 | 262
90 Days DQ | 369 | 695 | $ 369 | $ 695
Residential bridge loans held-for-investment | $0 to $250 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 6.53% | 8.00%
Residential bridge loans held-for-investment | $0 to $250 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 12.00% | 12.00%
Residential bridge loans held-for-investment | $251 to $500 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance, minimum | 251 | 251 | $ 251 | $ 251
Loan Balance, maximum | 500 | 500 | $ 500 | $ 500
Number of Loans | loan |  |  | 198 | 38
Total Principal | 71,361 | 13,297 | $ 71,361 | $ 13,297
30-89 Days DQ | 2,811 | 636 | 2,811 | 636
90 Days DQ | 675 | 469 | $ 675 | $ 469
Residential bridge loans held-for-investment | $251 to $500 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 6.99% | 8.00%
Residential bridge loans held-for-investment | $251 to $500 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 13.00% | 10.00%
Residential bridge loans held-for-investment | $501 to $750 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance, minimum | 501 | 501 | $ 501 | $ 501
Loan Balance, maximum | 750 | 750 | $ 750 | $ 750
Number of Loans | loan |  |  | 71 | 21
Total Principal | 42,862 | 12,410 | $ 42,862 | $ 12,410
30-89 Days DQ | 2,072 | 1,769 | 2,072 | 1,769
90 Days DQ | 508 | 0 | $ 508 | $ 0
Residential bridge loans held-for-investment | $501 to $750 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 6.99% | 7.50%
Residential bridge loans held-for-investment | $501 to $750 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 9.99% | 10.00%
Residential bridge loans held-for-investment | $751 to $1,000 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance, minimum | 751 | 751 | $ 751 | $ 751
Loan Balance, maximum | 1,000 | 1,000 | $ 1,000 | $ 1,000
Number of Loans | loan |  |  | 40 | 19
Total Principal | 34,646 | 16,937 | $ 34,646 | $ 16,937
30-89 Days DQ | 1,771 | 840 | 1,771 | 840
90 Days DQ | 2,443 | 0 | $ 2,443 | $ 0
Residential bridge loans held-for-investment | $751 to $1,000 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 7.28% | 7.50%
Residential bridge loans held-for-investment | $751 to $1,000 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 10.00% | 10.00%
Residential bridge loans held-for-investment | Over $1,000 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance, maximum | 1,000 | 1,000 | $ 1,000 | $ 1,000
Number of Loans | loan |  |  | 137 | 29
Total Principal | 394,914 | 61,775 | $ 394,914 | $ 61,775
30-89 Days DQ | 31,452 | 1,484 | 31,452 | 1,484
90 Days DQ | $ 4,994 | $ 10,970 | $ 4,994 | $ 10,970
Residential bridge loans held-for-investment | Over $1,000 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 5.79% | 8.00%
Residential bridge loans held-for-investment | Over $1,000 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 10.25% | 10.00%
Redwood | Single-family rental loans held-for-investment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | loan | 107 |  | 107 |
Total Principal | $ 231,211 |  | $ 231,211 |
30-89 Days DQ | 0 |  | 0 |
90 Days DQ | 0 |  | 0 |
Redwood | Single-family rental 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 |  |  | 20 |
Total Principal | 7,925 |  | $ 7,925 |
30-89 Days DQ | 0 |  | 0 |
90 Days DQ | 0 |  | $ 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] |  |  |  |
Loan Balance, minimum | 501 |  | $ 501 |
Loan Balance, maximum | 750 |  | $ 750 |
Number of Loans | loan |  |  | 26 |
Total Principal | 15,620 |  | $ 15,620 |
30-89 Days DQ | 0 |  | 0 |
90 Days DQ | 0 |  | $ 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] |  |  |  |
Loan Balance, minimum | 751 |  | $ 751 |
Loan Balance, maximum | 1,000 |  | $ 1,000 |
Number of Loans | loan |  |  | 16 |
Total Principal | 13,616 |  | $ 13,616 |
30-89 Days DQ | 0 |  | 0 |
90 Days DQ | 0 |  | $ 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] |  |  |  |
Loan Balance, maximum | 1,000 |  | $ 1,000 |
Number of Loans | loan |  |  | 45 |
Total Principal | 194,050 |  | $ 194,050 |
30-89 Days DQ | 0 |  | 0 |
90 Days DQ | $ 0 |  | $ 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 | 783 |  | 783 |
Total Principal | $ 2,078,214 |  | $ 2,078,214 |
30-89 Days DQ | 22,771 |  | 22,771 |
90 Days DQ | 29,039 |  | 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 |  | 0 |
Loan Balance, maximum | 250 |  | $ 250 |
Number of Loans | loan |  |  | 2 |
Total Principal | 398 |  | $ 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 |  |  | 5.46% |
CAFL | Single-family rental loans held-for-investment | $0 to $250 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 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 |  | $ 251 |
Loan Balance, maximum | 500 |  | $ 500 |
Number of Loans | loan |  |  | 56 |
Total Principal | 25,643 |  | $ 25,643 |
30-89 Days DQ | 1,306 |  | 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 |  |  | 4.92% |
CAFL | Single-family rental loans held-for-investment | $251 to $500 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 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 |  | $ 501 |
Loan Balance, maximum | 750 |  | $ 750 |
Number of Loans | loan |  |  | 148 |
Total Principal | 91,414 |  | $ 91,414 |
30-89 Days DQ | 1,259 |  | 1,259 |
90 Days DQ | 1,990 |  | $ 1,990 |
CAFL | Single-family rental loans held-for-investment | $501 to $750 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 4.75% |
CAFL | Single-family rental loans held-for-investment | $501 to $750 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 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 |  | $ 751 |
Loan Balance, maximum | 1,000 |  | $ 1,000 |
Number of Loans | loan |  |  | 98 |
Total Principal | 85,472 |  | $ 85,472 |
30-89 Days DQ | 1,639 |  | 1,639 |
90 Days DQ | 879 |  | $ 879 |
CAFL | Single-family rental loans held-for-investment | $751 to $1,000 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 4.62% |
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% |
CAFL | Single-family rental 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 |  |  | 479 |
Total Principal | 1,875,287 |  | $ 1,875,287 |
30-89 Days DQ | 18,567 |  | 18,567 |
90 Days DQ | $ 26,170 |  | $ 26,170 |
CAFL | Single-family rental loans held-for-investment | Over $1,000 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 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% |

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