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Residential Whole Loans (Purchased Performing Loans) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) loan	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) loan	Sep. 30, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average LTV Ratio			80.00%
Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provisions for loan losses	$ 347,000	$ 164,000	$ 915,000	$ 131,000
Purchased Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of other loans at carrying value | loan	166		166
Unpaid balance of other loans	$ 66,400,000		$ 66,400,000
Total outstanding principal balance of all of the Company’s purchased performing loans	1.60%		1.60%
Weighted Average LTV Ratio			68.00%
Allowance for loan loss	$ 388,000		$ 388,000
Provisions for loan losses	0		622,000	$ 0
Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commitment to lend, unfunded	$ 126,000,000.0		$ 126,000,000.0

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The LTV of which the Company has assessed its residential whole loans at carrying value will have a higher likelihood of default than newly originated mortgage loans

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