Borrowings (Schedule of Debt Repayments) (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Debt Instrument [Line Items]
Expected principal repayments related to consolidated residential mortgage loan securitizations	$ 1,141,000
Repurchase Agreements
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	2,182,478
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	0
2020 Scheduled Repayment of Principal	103,420
2021 Scheduled Repayment of Principal	0
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	0
Total Scheduled Repayment of Principal	2,285,898
Other Secured Borrowings
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	530,347
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	322,754
2020 Scheduled Repayment of Principal	325,502
2021 Scheduled Repayment of Principal	187,053
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	137,651
Total Scheduled Repayment of Principal	1,503,307
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
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	3,918,574
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	1,474,629
2020 Scheduled Repayment of Principal	1,256,515
2021 Scheduled Repayment of Principal	882,373
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	1,008,070
Total Scheduled Repayment of Principal	8,540,161
HMBS-related obligations
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	1,205,749
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	1,151,875
2020 Scheduled Repayment of Principal	827,593
2021 Scheduled Repayment of Principal	695,320
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	660,419
Total Scheduled Repayment of Principal	$ 4,540,956

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
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