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Residential Whole Loans - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) loan	Dec. 31, 2022 USD ($)	Jun. 30, 2023 USD ($)
Receivables [Abstract]
Total residential whole loans	$ 8,100,000	$ 7,500,000	$ 8,100,000
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 3,800		7,400
Number of loan modifications | loan	2
Average increase in weighted life	13 months
Loan carrying value	$ 165		165
Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loss on sale of financing receivable		72,300
Financing receivable, nonaccrual	354,100	413,100	354,100
Interest income	2,700		5,300
Agency eligible investor loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, sale		337,800
Agency eligible investor loans | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, sale		598,000
Purchased Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	192,900	195,100	192,900
Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	71,800	80,500	71,800
Without Associated Credit Losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	$ 57,800	$ 71,700	$ 57,800

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