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Residential Mortgage Loans Held in Securitization Trusts, Net and Real Estate Owned - Loans in Delinquency (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Delinquent Loans, Real estate owned through foreclosure | loan		1
Real estate owned held in residential securitization trusts | $	$ 0	$ 118,000
% of Loan Portfolio, Real estate owned through foreclosure		0.15%
30 - 60
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Delinquent Loans | loan		1
Total Unpaid Principal | $		$ 203,000
% of Loan Portfolio		0.26%
61 - 90
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Delinquent Loans | loan		1
Total Unpaid Principal | $		$ 173,000
% of Loan Portfolio		0.22%
90
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Delinquent Loans | loan	19	24
Total Unpaid Principal | $	$ 10,926,000	$ 16,147,000
% of Loan Portfolio	18.16%	20.80%

X

- Definition

The aggregate number of delinquent loans.

+ References

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- Definition

Number of delinquent loans through foreclosure.

+ References

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- Definition

Percent of loan portfolio.

+ References

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- Definition

The aggregate percentage of the loan portfolio through foreclosure.

+ References

No definition available.

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- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4437-111522

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