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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, 2021	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	$ 3,287,689			$ 3,521,624
Purchased Credit Deteriorated Loans	$ 644,611			673,708
Weighted Average LTV Ratio	80.00%
Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	$ 2,243,444			2,357,185
Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	464,385			581,801
Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	451,791			446,374
Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	$ 128,069			136,264
90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average LTV Ratio	82.56%	86.78%
90 or more | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	$ 132,732			144,681
90 or more | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	136,991			136,347
90 or more | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	24,052			20,233
90 or more | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	9,449			8,823
Settled Whole Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential whole loans, at carrying value, total or weighted average	3,869,056			4,108,499
Amortized Cost Basis	3,932,300			4,195,332
Unpaid Principal Balance (“UPB”)	$ 3,986,725			$ 4,249,418
Weighted Average Coupon	5.72%			5.77%
Weighted Average Term to Maturity (Months)	288 months		282 months
Settled Whole Loans | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	$ 2,228,899			$ 2,336,117
Amortized Cost Basis	2,243,444			2,357,185
Unpaid Principal Balance (“UPB”)	$ 2,183,662			$ 2,294,086
Weighted Average Coupon	5.82%			5.84%
Weighted Average Term to Maturity (Months)	350 months		351 months
Weighted Average LTV Ratio	64.00%		64.00%
Weighted Average FICO Scores	713		712
Settled Whole Loans | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	$ 450,717			$ 563,430
Amortized Cost Basis	464,385			581,801
Unpaid Principal Balance (“UPB”)	$ 464,385			$ 581,801
Weighted Average Coupon	7.23%			7.29%
Weighted Average Term to Maturity (Months)	3 months		3 months
Weighted Average LTV Ratio	64.00%		63.00%
Weighted Average FICO Scores	719		719
Settled Whole Loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	$ 449,045			$ 442,456
Amortized Cost Basis	451,791			446,374
Unpaid Principal Balance (“UPB”)	$ 447,072			$ 442,208
Weighted Average Coupon	6.29%			6.32%
Weighted Average Term to Maturity (Months)	320 months		324 months
Weighted Average LTV Ratio	70.00%		70.00%
Weighted Average FICO Scores	730		730
Settled Whole Loans | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	$ 128,003			$ 136,157
Amortized Cost Basis	128,069			136,264
Unpaid Principal Balance (“UPB”)	$ 139,847			$ 149,004
Weighted Average Coupon	3.12%			3.30%
Weighted Average Term to Maturity (Months)	169 months		171 months
Weighted Average LTV Ratio	39.00%		40.00%
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	$ 612,392			$ 630,339
Amortized Cost Basis	644,611			673,708
Unpaid Principal Balance (“UPB”)	$ 751,759			$ 782,319
Weighted Average Coupon	4.49%			4.46%
Weighted Average Term to Maturity (Months)	285 months		287 months
Weighted Average LTV Ratio	75.00%		76.00%
Settled Whole Loans | Certain Rehabilitation Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	$ 151,700			$ 189,900
Weighted Average LTV Ratio	68.00%		69.00%
Settled Whole Loans | Current | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	$ 1,975,505			2,099,134
Settled Whole Loans | Current | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	293,931			390,706
Settled Whole Loans | Current | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	421,258			415,386
Settled Whole Loans | Current | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	115,315			124,877
Settled Whole Loans | 30-59 | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	89,767			73,163
Settled Whole Loans | 30-59 | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	21,296			29,315
Settled Whole Loans | 30-59 | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	4,507			6,652
Settled Whole Loans | 30-59 | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	2,445			2,186
Settled Whole Loans | 60-89 | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	42,912			36,501
Settled Whole Loans | 60-89 | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	12,167			25,433
Settled Whole Loans | 60-89 | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	1,935			3,948
Settled Whole Loans | 60-89 | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	1,589			1,170
Settled Whole Loans | 90 or more | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	135,260			148,387
Settled Whole Loans | 90 or more | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	136,991			136,347
Settled Whole Loans | 90 or more | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	24,091			20,388
Settled Whole Loans | 90 or more | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	8,721			8,031
Settled Whole Loans | 90 or more | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	$ 117,509			$ 119,621

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