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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of the Company's Financial Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Financial Assets:
Cash and cash equivalents	$ 172,513	$ 118,763	$ 65,359
Receivable for securities sold	213,585	0
Investment securities available for sale	442,532	1,760,812
Investment in unconsolidated entities, carrying value	211,965	189,965
Preferred equity and mezzanine loan investments, carrying value	277,008	169,214
Derivative assets	0	15,878
Financial Liabilities
Outstanding repurchase agreements	713,364	2,352,102
Subordinated debentures, carrying value	45,000	45,000
Convertible notes, carrying value	133,534	132,955
Residential collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	38,959	40,429
Residential collateralized debt obligations, at fair value
Financial Liabilities
Secured debt, carrying value	1,034,992	1,052,829
Level 1
Financial Assets:
Cash and cash equivalents	172,513	118,763
Cash and cash equivalents, estimated fair value	172,513	118,763
Receivable for securities sold	213,585	0
Level 1 | Cash margin
Financial Assets:
Cash and cash equivalents	169,484	0
Cash and cash equivalents, estimated fair value	169,484	0
Level 2
Financial Assets:
Investment securities available for sale	887,308	2,006,140
Derivative assets	0	15,878
Financial Liabilities
Convertible notes, carrying value	133,534	132,955
Convertible notes, estimated fair value	76,794	140,865
Level 2 | Portfolio Investments
Financial Liabilities
Outstanding repurchase agreements	1,428,124	3,105,416
Level 3
Financial Assets:
Residential mortgage loans, at fair value	2,776,630
Investment in unconsolidated entities, carrying value	211,965	189,965
Investments in unconsolidated entities, estimated fair value	211,965	191,359
Preferred equity and mezzanine loan investments, carrying value	179,292	180,045
Preferred equity and mezzanine loan investments, estimated fair value	179,292	182,465
Loans held for sale, net, carrying value	0	2,406
Loans held for sale, net, estimated fair value	0	2,482
Financial Liabilities
Subordinated debentures, carrying value	45,000	45,000
Subordinated debentures, estimated fair value	12,451	41,592
Level 3 | Residential collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	38,959	40,429
Secured debt, estimated fair value	35,029	38,888
Level 3 | Multi-family collateralized debt obligations, at fair value
Financial Liabilities
Secured debt, carrying value	0	16,724,451
Secured debt, estimated fair value	0	16,724,451
Level 3 | Residential collateralized debt obligations, at fair value
Financial Liabilities
Secured debt, carrying value	1,034,992	1,052,829
Secured debt, estimated fair value	1,034,992	1,052,829
Level 3 | Residential loans
Financial Assets:
Residential mortgage loans, at fair value	1,515,347	1,429,754
Level 3 | Residential loans held in securitization trusts
Financial Assets:
Residential mortgage loans, at fair value	42,984	0
Level 3 | Residential loans, net
Financial Assets:
Residential mortgage loans	0	202,756
Residential mortgage loans, estimated fair value	0	208,471
Level 3 | Multi-family loans held in securitization trusts, at fair value
Financial Assets:
Residential mortgage loans	0	17,816,746
Residential mortgage loans, estimated fair value	0	17,816,746
VIE, Primary Beneficiary | Level 3 | Residential collateralized debt obligations, at fair value
Financial Liabilities
Secured debt, carrying value	1,034,992
VIE, Primary Beneficiary | Consolidated SLST
Financial Liabilities
Secured debt, carrying value	1,034,992	1,052,829
VIE, Primary Beneficiary | Consolidated SLST | Level 3
Financial Assets:
Residential mortgage loans, at fair value	$ 1,218,299	$ 1,328,886

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