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Commitments and Contingencies - Additional Information (Detail) $ in Thousands	May 06, 2016 lawsuit	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Aug. 31, 2016 lawsuit
Schedule of Equity Method Investments [Line Items]
Number of class action lawsuits | lawsuit				2
Number of consolidated lawsuits | lawsuit	3
Unfunded loan commitments | $		$ 80,164	$ 170,365
Commercial Mortgage and Subordinated Portfolio Segment [Member]
Schedule of Equity Method Investments [Line Items]
Unfunded loan commitments | $		$ 80,164

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Loss Contingency, Number of Consolidated Lawsuits

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