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Residential Whole Loans (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 63,244	$ 86,833	$ 218,011	$ 3,025	$ 86,833
Transition adjustment on adoption of ASU 2016-13				70,555	70,600
Current provision	(8,583)	(22,372)	(10,614)	74,897
Write-offs	(400)	(1,217)	(627)	(647)	(1,617)
Valuation adjustment on loans held for sale			70,181	(70,181)
Ending balance	54,261	63,244	136,589	218,011	54,261
Loans	3,470,385				3,470,385
Gross up of the amortized cost basis of Purchased Credit Deteriorated Loans					62,400
Non-QM loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14,545	21,068	103,831	388	21,068
Transition adjustment on adoption of ASU 2016-13				6,904
Current provision	(2,416)	(6,523)	(2,297)	26,358
Write-offs	(37)	0	0	0
Valuation adjustment on loans held for sale			70,181	(70,181)
Ending balance	12,092	14,545	31,353	103,831	12,092
Rehabilitation loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	13,668	18,371	35,633	2,331	18,371
Transition adjustment on adoption of ASU 2016-13				517
Current provision	(1,809)	(3,700)	(5,213)	33,213
Write-offs	(255)	(1,003)	(420)	(428)
Valuation adjustment on loans held for sale			0	0
Ending balance	11,604	13,668	30,000	35,633	11,604
Loans	120,400		181,800		120,400
Single-family rental loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,746	3,918	7,431	62	3,918
Transition adjustment on adoption of ASU 2016-13				754
Current provision	(386)	(1,172)	(500)	6,615
Write-offs	0	0	0	0
Valuation adjustment on loans held for sale			0	0
Ending balance	2,360	2,746	6,931	7,431	2,360
Seasoned performing loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	66	107	249	0	107
Transition adjustment on adoption of ASU 2016-13				19
Current provision	(9)	(41)	(25)	230
Write-offs	0	0	0	0
Valuation adjustment on loans held for sale			0	0
Ending balance	57	66	224	249	57
Purchased credit deteriorated loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	32,219	43,369	70,867	244	43,369
Transition adjustment on adoption of ASU 2016-13				62,361
Current provision	(3,963)	(10,936)	(2,579)	8,481
Write-offs	(108)	(214)	(207)	(219)
Valuation adjustment on loans held for sale			0	0
Ending balance	28,148	$ 32,219	68,081	$ 70,867	28,148
Loans	83,100		100,000		83,100
Unfunded Loan Commitment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance	512		2,100		512
Commitment to lend, unfunded	$ 40,300		$ 94,500		$ 40,300

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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