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Residential Whole Loans (Narrative) (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021 USD ($) loan	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Receivables [Abstract]
Total residential whole loans	$ 7,100,000	$ 7,100,000		$ 5,300,000
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of whole loans sold | loan	0	0
Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, sale			$ 24,100
Loss on sale of financing receivable			800
Financing receivable, nonaccrual	$ 624,900	$ 624,900		730,900
Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, sale			1,800,000
Loss on sale of financing receivable			$ 273,000
Purchased Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	275,900	275,900		373,300
Purchased credit deteriorated loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	113,000	113,000		151,400
Without Associated Credit Losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	$ 122,300	$ 122,300		$ 130,700

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