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Residential Whole Loans (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Total residential whole loans	$ 7,000,000	$ 7,400,000
Accounts, Notes, Loans and Financing Receivable [Line Items]
Valuation adjustment on loans held for sale	70,181
Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, sale	659,900
Gain on sale of financing receivable	145,800
Valuation adjustment on loans held for sale	70,181
Purchased Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	134,400	$ 99,900
Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Valuation adjustment on loans held for sale	0
Financing receivable, nonaccrual	$ 99,000

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Amount of financing receivable on nonaccrual status.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
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-Publisher FASB
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Amount of decrease from sale and reclassification to held-for-sale of financing receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of gain (loss) on sale of financing receivable.

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-Publisher FASB
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