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Residential Whole Loans (Interest Income Components) (Details) - Residential whole loans - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 69,016	$ 84,837	$ 133,554	$ 190,872
Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	11,303	9,335	19,593	18,481
Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	38,005	60,092	75,932	134,432
Performing | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	21,968	37,259	44,156	86,329
Performing | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	7,329	13,312	13,996	28,639
Performing | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	6,906	7,268	13,987	14,611
Performing | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	1,540	2,253	3,531	4,853
Performing | Agency eligible investor loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	262	0	262	0
Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	19,708	15,410	38,029	37,959
Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	46,400	69,427	92,617	152,913
Carrying Value | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	11,303	9,335	19,593	18,481
Carrying Value | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	35,097	60,092	73,024	134,432
Carrying Value | Performing | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	20,164	37,259	42,352	86,329
Carrying Value | Performing | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	6,954	13,312	13,621	28,639
Carrying Value | Performing | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	6,439	7,268	13,520	14,611
Carrying Value | Performing | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	1,540	2,253	3,531	4,853
Carrying Value | Performing | Agency eligible investor loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	0	0	0	0
Carrying Value | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	0	0	0	0
Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	22,616	15,410	40,937	37,959
Fair Value | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	0	0	0	0
Fair Value | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income			2,908	0
Fair Value | Performing | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income			1,804	0
Fair Value | Performing | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income			375	0
Fair Value | Performing | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income			467	0
Fair Value | Performing | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income			0	0
Fair Value | Performing | Agency eligible investor loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income			262	0
Fair Value | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 19,708	$ 15,410	$ 38,029	$ 37,959

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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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