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Residential Whole Loans - Interest Income Components (Details) - Residential whole loans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 303,468	$ 332,212	$ 358,161
Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	182,597	222,526	200,634
Nonperforming Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	80,741	73,448	114,181
Non-QM loans | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	96,948	136,527	116,282
Rehabilitation loans | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	33,129	49,484	54,419
Single-family rental loans | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	34,169	27,722	17,742
Seasoned performing loans | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	6,684	8,793	12,191
Agency eligible investor loans | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	11,667	0	0
Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	40,130	36,238	43,346
Held at Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	169,618	258,764	243,980
Held at Carrying Value | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	129,488	222,526	200,634
Held at Carrying Value | Nonperforming Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	0	0	0
Held at Carrying Value | Non-QM loans | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	75,517	136,527	116,282
Held at Carrying Value | Rehabilitation loans | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	22,424	49,484	54,419
Held at Carrying Value | Single-family rental loans | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	24,863	27,722	17,742
Held at Carrying Value | Seasoned performing loans | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	6,684	8,793	12,191
Held at Carrying Value | Agency eligible investor loans | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	0	0	0
Held at Carrying Value | Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	40,130	36,238	43,346
Held at Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	133,850	73,448	114,181
Held at Fair Value | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	53,109	0	0
Held at Fair Value | Nonperforming Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	80,741	73,448	114,181
Held at Fair Value | Non-QM loans | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	21,431	0	0
Held at Fair Value | Rehabilitation loans | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	10,705	0	0
Held at Fair Value | Single-family rental loans | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	9,306	0	0
Held at Fair Value | Seasoned performing loans | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	0	0	0
Held at Fair Value | Agency eligible investor loans | Performing Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	11,667	0	0
Held at Fair Value | Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 0	$ 0	$ 0

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- Definition

The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.1)
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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