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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	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Financial Assets:
Cash and cash equivalents	$ 84,717	$ 95,191	$ 75,391
Investment securities available for sale	1,290,015	1,413,081
Derivative assets	10,543	10,101
Preferred equity and mezzanine loan investments, carrying value	99,213	108,567
Financial Liabilities
Financing arrangements	1,179,961	1,276,918
Subordinated debentures, carrying value	45,000	45,000
Convertible notes, carrying value	129,738	128,749
Distressed residential mortgage loans held in securitization trusts, carrying amount	105,851	121,791
Distressed residential mortgage loans
Financial Liabilities
Distressed residential mortgage loans held in securitization trusts, carrying amount	105,900	121,800
Distressed residential mortgage loans
Financial Assets:
Residential mortgage loans held in securitization trusts, net	184,700	209,700
Financial Liabilities
Distressed residential mortgage loans held in securitization trusts, carrying amount	290,600	331,500
Equity Method Investments
Financial Assets:
Investment in unconsolidated entities, carrying value	8,519	8,320
Investments in unconsolidated entities, estimated fair value	45,152	42,823
Portfolio Investments
Financial Liabilities
Financing arrangements	1,179,961	1,276,918
Residential collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	62,198	70,308
Multi-family collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	8,838,841	9,189,459
Residential mortgage loans, at fair value | Distressed residential mortgage loans
Financial Assets:
Residential mortgage loans held in securitization trusts, net	96,900	36,900
Residential mortgage loans, at fair value | Second Mortgage
Financial Assets:
Residential mortgage loans held in securitization trusts, net	72,300	50,200
Available-for-sale securities
Financial Liabilities
Investment securities, available for sale held in securitization trusts	50,134	47,922
Level 1
Financial Assets:
Cash and cash equivalents	84,717	95,191
Cash and cash equivalents, estimated fair value	84,717	95,191
Level 3
Financial Assets:
Mortgage loans held for sale, net, carrying value	4,750	5,507
Mortgage loans held for sale, net, estimated fair value	5,090	5,598
Mortgage loans held for investment, carrying value	1,760	1,760
Mortgage loans held for investment, estimated fair value	1,900	1,900
Preferred equity and mezzanine loan investments, carrying value	176,741	138,920
Preferred equity and mezzanine loan investments, estimated fair value	178,848	140,129
Investment in unconsolidated entities, carrying value	53,671	51,143
Investments in unconsolidated entities, estimated fair value	53,737	51,212
Financial Liabilities
Secured debt, carrying value	61,026	81,537
Secured debt, estimated fair value	65,894	87,891
Subordinated debentures, carrying value	45,000	45,000
Subordinated debentures, estimated fair value	45,000	45,002
Level 3 | Residential collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	62,198	70,308
Secured debt, estimated fair value	59,635	66,865
Level 3 | Multi-family collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	8,838,841	9,189,459
Secured debt, estimated fair value	8,838,841	9,189,459
Level 3 | Residential mortgage loans held in securitization trusts
Financial Assets:
Residential mortgage loans held in securitization trusts, net	66,047	73,820
Residential mortgage loans held in securitization trusts, net, estimated fair value	65,118	72,131
Level 3 | Distressed residential mortgage loans
Financial Assets:
Residential mortgage loans held in securitization trusts, net	290,645	331,464
Residential mortgage loans held in securitization trusts, net, estimated fair value	292,592	334,765
Level 3 | Residential mortgage loans, at fair value
Financial Assets:
Residential mortgage loans held in securitization trusts, net	169,197	87,153
Residential mortgage loans held in securitization trusts, net, estimated fair value	169,197	87,153
Level 3 | Multi-family loans held in securitization trusts
Financial Assets:
Residential mortgage loans held in securitization trusts, net	9,345,360	9,657,421
Residential mortgage loans held in securitization trusts, net, estimated fair value	9,345,360	9,657,421
Level 2
Financial Assets:
Derivative assets	10,543	10,101
Financial Liabilities
Convertible notes, carrying value	129,738	128,749
Convertible notes, estimated fair value	137,338	140,060
Level 2 | Portfolio Investments
Financial Liabilities
Financing arrangements	1,179,961	1,276,918
Level 2 | Distressed residential mortgage loans
Financial Liabilities
Financing arrangements	$ 192,233	$ 149,063

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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