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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	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Financial Assets:
Cash and cash equivalents	$ 65,906	$ 103,724	$ 57,471
Investment securities available for sale	1,904,018	1,512,252
Preferred equity and mezzanine loan investments, carrying value	205,642	114,821
Derivative assets	20,673	10,263
Financial Liabilities
Outstanding repurchase agreements	1,823,910	1,543,577
Subordinated debentures, carrying value	45,000	45,000
Convertible notes, carrying value	132,395	130,762
Residential collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	42,119	53,040
Multi-family collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	14,978,199	11,022,248
Level 1
Financial Assets:
Cash and cash equivalents	65,906	103,724
Cash and cash equivalents, estimated fair value	65,906	103,724
Level 3
Financial Assets:
Investment in unconsolidated entities, carrying value	168,933	73,466
Investments in unconsolidated entities, estimated fair value	170,150	73,833
Preferred equity and mezzanine loan investments, carrying value	178,997	165,555
Preferred equity and mezzanine loan investments, estimated fair value	181,626	167,739
Mortgage loans held for sale, net, carrying value	2,437	3,414
Mortgage loans held for sale, net, estimated fair value	2,525	3,584
Mortgage loans held for investment, carrying value	0	1,580
Mortgage loans held for investment, estimated fair value	0	1,580
Financial Liabilities
Secured debt, carrying value	0	42,335
Secured debt, estimated fair value	0	45,030
Subordinated debentures, carrying value	45,000	45,000
Subordinated debentures, estimated fair value	41,273	44,897
Level 3 | Residential collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	42,119	53,040
Secured debt, estimated fair value	40,534	50,031
Level 3 | Multi-family collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	14,978,199	11,022,248
Secured debt, estimated fair value	14,978,199	11,022,248
Level 3 | Distressed and other residential mortgage loans, at fair value
Financial Assets:
Residential mortgage loans, carrying value	1,116,128	737,523
Residential mortgage loans, estimated fair value	1,116,128	737,523
Level 3 | Distressed residential mortgage loans
Financial Assets:
Residential mortgage loans, carrying value	210,466	285,261
Residential mortgage loans, estimated fair value	213,398	289,376
Level 3 | Multi-family loans held in securitization trusts
Financial Assets:
Residential mortgage loans, carrying value	15,863,264	11,679,847
Residential mortgage loans, estimated fair value	15,863,264	11,679,847
Level 2
Financial Assets:
Derivative assets	20,673	10,263
Financial Liabilities
Convertible notes, carrying value	132,395	130,762
Convertible notes, estimated fair value	140,557	135,689
Level 2 | Portfolio Investments
Financial Liabilities
Outstanding repurchase agreements	$ 2,559,880	$ 2,131,505

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