Investments Fair Value Inputs, Assets, Quantitative Information (Details) - Discounted Cash Flow [Member] - Limited Partner - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
DCR Mortgage Fund VI, L.P.
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ (56)	$ (88)
Fair Value Inputs, Discount Rate	2.35%	2.35%
RCH Mortgage Fund VI, L.P.
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ (341)	$ (341)
Fair Value Inputs, Discount Rate	7.35%	7.35%