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Residential Whole Loans - Allowance for Credit Losses (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | $ 39,447,000 | $ 86,833,000
Current provision | (3,467,000) | (22,372,000)
Write-offs | (523,000) | (1,217,000)
Ending balance | 35,457,000 | 63,244,000
Allowance for loan loss | 35,457,000 | 63,244,000
Loans | 2,320,048,000 |
Non-QM loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 8,289,000 | 21,068,000
Current provision | (909,000) | (6,523,000)
Write-offs | (51,000) | 0
Ending balance | 7,329,000 | 14,545,000
Allowance for loan loss | 7,329,000 | 14,545,000
Rehabilitation loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 6,881,000 | 18,371,000
Current provision | (1,460,000) | (3,700,000)
Write-offs | (219,000) | (1,003,000)
Ending balance | 5,202,000 | 13,668,000
Allowance for loan loss | 5,202,000 | 13,668,000
Loans | 80,200,000 | 149,200,000
Single-family rental loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 1,451,000 | 3,918,000
Current provision | (122,000) | (1,172,000)
Write-offs | (27,000) | 0
Ending balance | 1,302,000 | 2,746,000
Allowance for loan loss | 1,302,000 | 2,746,000
Seasoned performing loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 46,000 | 107,000
Current provision | (1,000) | (41,000)
Write-offs | 0 | 0
Ending balance | 45,000 | 66,000
Allowance for loan loss | 45,000 | 66,000
Purchased Credit Deteriorated Loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 22,780,000 | 43,369,000
Current provision | (975,000) | (10,936,000)
Write-offs | (226,000) | (214,000)
Ending balance | 21,579,000 | 32,219,000
Allowance for loan loss | 21,579,000 | 32,219,000
Loans | 69,100,000 | 87,700,000
Unfunded Loan Commitment |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Ending balance | 156,000 | 795,905
Commitment to lend, unfunded | 12,900,000 | 54,400,000
Allowance for loan loss | $ 156,000 | $ 795,905

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