Borrowings (Schedule of Debt Repayments) (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Debt Instrument [Line Items]
Expected principal repayments related to consolidated residential mortgage loan securitizations	$ 699,600
Repurchase Agreements
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	1,252,846
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	41,703
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	1,294,549
Other Secured Borrowings
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	315,549
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	195,176
2020 Scheduled Repayment of Principal	232,742
2021 Scheduled Repayment of Principal	52,229
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	59,999
Total Scheduled Repayment of Principal	855,695
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	86,000
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	1,568,395
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two	236,879
2020 Scheduled Repayment of Principal	318,742
2021 Scheduled Repayment of Principal	52,229
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	59,999
Total Scheduled Repayment of Principal	$ 2,236,244

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-Paragraph 3
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