Borrowings (Schedule of Debt Repayments) (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Expected principal repayments related to consolidated residential mortgage loan securitizations	$ 1,250,000
Repurchase Agreements
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	2,609,685
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	0
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	2,609,685
Other Secured Borrowings
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	486,088
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	313,129
2020 Scheduled Repayment of Principal	305,673
2021 Scheduled Repayment of Principal	272,371
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	148,555
Total Scheduled Repayment of Principal	1,525,816
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	0
2020 Scheduled Repayment of Principal	0
2021 Scheduled Repayment of Principal	0
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	210,000
Total Scheduled Repayment of Principal	210,000
Total
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	4,661,830
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	1,500,955
2020 Scheduled Repayment of Principal	1,127,867
2021 Scheduled Repayment of Principal	975,368
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	1,015,943
Total Scheduled Repayment of Principal	9,281,963
HMBS-related obligations
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	1,566,057
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	1,187,826
2020 Scheduled Repayment of Principal	822,194
2021 Scheduled Repayment of Principal	702,997
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	657,388
Total Scheduled Repayment of Principal	$ 4,936,462

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690

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