Borrowings (Schedule of Debt Repayments) (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Debt Instrument [Line Items]
Expected principal repayments related to consolidated residential mortgage loan securitizations	$ 937,200
Repurchase Agreements
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	1,828,416
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	81,095
2020 Scheduled Repayment of Principal	0
2021 Scheduled Repayment of Principal	0
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	0
Total Scheduled Repayment of Principal	1,909,511
Other Secured Borrowings
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	458,602
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	260,649
2020 Scheduled Repayment of Principal	282,449
2021 Scheduled Repayment of Principal	0
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	0
Total Scheduled Repayment of Principal	1,001,700
Senior Notes
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	0
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	86,000
2020 Scheduled Repayment of Principal	0
2021 Scheduled Repayment of Principal	0
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	0
Total Scheduled Repayment of Principal	86,000
Total
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	2,287,018
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	427,744
2020 Scheduled Repayment of Principal	282,449
2021 Scheduled Repayment of Principal	0
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	0
Total Scheduled Repayment of Principal	$ 2,997,211

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+ References

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 3
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