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Residential Whole Loans (Residential Whole Loans, at Carrying Value - Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		$ 3,791,792		$ 5,370,653
Purchased Credit Deteriorated Loans		702,013		698,717
Residential whole loans, at carrying value, total or weighted average		$ 4,493,806
Weighted Average LTV Ratio		80.00%
Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		$ 2,465,148		3,707,245
Residential whole loans, at carrying value, total or weighted average		2,465,148
Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		699,868		1,026,097
Residential whole loans, at carrying value, total or weighted average		699,868
Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		479,070		460,742
Residential whole loans, at carrying value, total or weighted average		479,070
Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		147,706		176,569
Residential whole loans, at carrying value, total or weighted average		$ 147,706
90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average LTV Ratio		87.82%	89.69%
Settled Whole Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential whole loans, at carrying value, total or weighted average		$ 4,387,559		6,066,345
Amortized Cost Basis		4,493,805		6,069,370
Unpaid Principal Balance (“UPB”)		$ 4,546,058		$ 6,141,421
Weighted Average Coupon		5.81%		5.96%
Weighted Average Term to Maturity (Months)	288 months	277 months
Settled Whole Loans | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		$ 2,438,395		$ 3,706,857
Amortized Cost Basis		2,465,148		3,707,245
Unpaid Principal Balance (“UPB”)		$ 2,397,247		$ 3,592,701
Weighted Average Coupon		5.87%		5.96%
Weighted Average Term to Maturity (Months)	368 months	352 months
Weighted Average LTV Ratio	67.00%	64.00%
Weighted Average FICO Scores	716	712
Settled Whole Loans | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		$ 677,235		$ 1,023,766
Amortized Cost Basis		699,868		1,026,097
Unpaid Principal Balance (“UPB”)		$ 699,868		$ 1,026,097
Weighted Average Coupon		7.28%		7.30%
Weighted Average Term to Maturity (Months)	8 months	4 months
Weighted Average LTV Ratio	64.00%	63.00%
Weighted Average FICO Scores	717	718
Settled Whole Loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		$ 474,045		$ 460,679
Amortized Cost Basis		479,070		460,741
Unpaid Principal Balance (“UPB”)		$ 475,072		$ 457,146
Weighted Average Coupon		6.28%		6.29%
Weighted Average Term to Maturity (Months)	324 months	319 months
Weighted Average LTV Ratio	70.00%	70.00%
Weighted Average FICO Scores	734	734
Settled Whole Loans | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		$ 147,556		$ 176,569
Amortized Cost Basis		147,706		176,569
Unpaid Principal Balance (“UPB”)		$ 161,257		$ 192,151
Weighted Average Coupon		3.45%		4.24%
Weighted Average Term to Maturity (Months)	181 months	173 months
Weighted Average LTV Ratio	46.00%	41.00%
Weighted Average FICO Scores	723	723
Settled Whole Loans | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Credit Deteriorated Loans		$ 650,328		$ 698,474
Amortized Cost Basis		702,013		698,718
Unpaid Principal Balance (“UPB”)		$ 812,614		$ 873,326
Weighted Average Coupon		4.45%		4.46%
Weighted Average Term to Maturity (Months)	294 months	289 months
Weighted Average LTV Ratio	81.00%	79.00%
Settled Whole Loans | Certain Rehabilitation Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Performing Loans		$ 222,200		$ 269,200
Weighted Average LTV Ratio	69.00%	68.00%
Settled Whole Loans | Current | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		$ 2,174,935		3,492,533
Settled Whole Loans | Current | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		491,343		868,281
Settled Whole Loans | Current | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		439,503		432,936
Settled Whole Loans | Current | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		136,622		187,683
Settled Whole Loans | 30-59 | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		74,231		59,963
Settled Whole Loans | 30-59 | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		65,166		67,747
Settled Whole Loans | 30-59 | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		16,111		15,948
Settled Whole Loans | 30-59 | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		1,406		2,164
Settled Whole Loans | 60-89 | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		52,069		19,605
Settled Whole Loans | 60-89 | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		22,995		27,437
Settled Whole Loans | 60-89 | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		7,373		2,047
Settled Whole Loans | 60-89 | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		880		430
Settled Whole Loans | 90 or more | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		163,913		20,600
Settled Whole Loans | 90 or more | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		120,364		62,632
Settled Whole Loans | 90 or more | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		16,083		6,215
Settled Whole Loans | 90 or more | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		8,798		1,874
Settled Whole Loans | 90 or more | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis		$ 122,478		$ 108,998

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