Borrowings (Schedule of Debt Repayments) (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Debt Instrument [Line Items]
Expected principal repayments related to consolidated residential mortgage loan securitizations	$ 1,221,000
Repurchase Agreements
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	2,895,019
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	2,895,019
Other Secured Borrowings
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	258,646
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	292,831
2020 Scheduled Repayment of Principal	259,469
2021 Scheduled Repayment of Principal	277,524
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	173,164
Total Scheduled Repayment of Principal	1,261,634
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	3,153,665
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	292,831
2020 Scheduled Repayment of Principal	259,469
2021 Scheduled Repayment of Principal	277,524
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	383,164
Total Scheduled Repayment of Principal	$ 4,366,653

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+ References

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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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