Fair value of financial instruments - Fair value inputs, quantitative information (Details) - Loans receivable - Residential mortgage - Fair value, inputs, level 3 - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Fair value inputs, assets, quantitative information [Line Items]
Equity discount rate	15.00%	15.00%
Debt to asset ratio	65.00%	65.00%
Cost of funds	3.50%	3.50%
LIBOR reference rate	1 month LIBOR	1 month LIBOR
Minimum
Fair value inputs, assets, quantitative information [Line Items]
Annual change in home pricing index	(18.60%)	0.00%
Loan resolution probabilities — modification	0.00%	0.00%
Loan resolution probabilities — rental	0.00%	0.00%
Loan resolution probabilities — liquidation	0.00%	0.00%
Loan resolution timelines (in years)	1 month 6 days	1 month 6 days
Value of underlying properties	$ 3	$ 3
Maximum
Fair value inputs, assets, quantitative information [Line Items]
Annual change in home pricing index	25.10%	10.20%
Loan resolution probabilities — modification	44.70%	44.70%
Loan resolution probabilities — rental	100.00%	100.00%
Loan resolution probabilities — liquidation	100.00%	100.00%
Loan resolution timelines (in years)	4 years 4 months 24 days	5 years 7 months 6 days
Value of underlying properties	$ 4,250	$ 4,500

Fair Value Assumptions, Value of Underlying Properties

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- Definition

Fair Value Inputs, Debt to Asset Ratio

+ References

No definition available.

+ Details

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- Definition

Fair Value Inputs, Interest Rate Over the Reference Rate

+ References

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- Definition

Fair Value Inputs, Loan Resolution Probability, Liquidation

+ References

No definition available.

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- Definition

Fair Value Inputs, Loan Resolution Probability, Modifications

+ References

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- Definition

Fair Value Inputs, Loan Resolution Probability, Rental Rate

+ References

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- Definition

Fair Value Inputs, Pricing Index

+ References

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- Definition

Fair Value Inputs, Reference Rate

+ References

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

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.

+ References

No definition available.

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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