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Residential Whole Loans (Details) $ in Thousands	Sep. 30, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,915,277
Allowance for Credit Losses	(37,192)	$ (39,447)
Total Residential Whole Loans	$ 8,194,049	$ 7,913,000
Number of loans | loan	26,193	24,095
Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Credit Losses	$ (37,192)	$ (39,447)
Total Residential Whole Loans	$ 1,878,083	$ 2,607,651
Number of loans | loan	7,388	9,361
Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Credit Losses	$ 0	$ 0
Total Residential Whole Loans	$ 6,315,966	$ 5,305,349
Number of loans | loan	18,805	14,734
Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 6,902,999	$ 6,332,405
Performing | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,434,596	2,099,326
Performing | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,468,403	4,233,079
Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	847,563	1,072,270
Nonperforming | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Nonperforming | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	847,563	1,072,270
Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,030,506
Non-QM loans | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,392,725	3,461,531
Non-QM loans | Performing | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,030,504	1,448,162
Non-QM loans | Performing | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,362,221	2,013,369
Residential transition loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	92,762
Residential transition loans | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,249,168	734,845
Residential transition loans | Performing | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	92,762	217,315
Residential transition loans | Performing | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,156,406	517,530
Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	224,302
Single-family rental loans | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,321,082	951,223
Single-family rental loans | Performing | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	224,302	331,808
Single-family rental loans | Performing | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,096,780	619,415
Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	87,028
Seasoned performing loans | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	87,028	102,041
Seasoned performing loans | Performing | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	87,028	102,041
Seasoned performing loans | Performing | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Agency eligible investor loans | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	852,996	1,082,765
Agency eligible investor loans | Performing | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Agency eligible investor loans | Performing | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	852,996	1,082,765
Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	480,679	547,772
Purchased Credit Deteriorated Loans | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	480,679	547,772
Purchased Credit Deteriorated Loans | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Multi-Family Transitional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 523,300	$ 213,900

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