Fair Value - Impaired Loans Held-for-investment - Tabular Disclosure (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Impaired Loans Held-for-investment
Impaired loans held-for-investment	$ 4,329	$ 6,527
Portion carried at fair value
Impaired Loans Held-for-investment
Impaired loans held-for-investment	1,312	2,988
Specific valuation allowance	(113)	(286)
Impaired loans held-for-investment carried at fair value, net	1,199	2,702
Portion carried at cost
Impaired Loans Held-for-investment
Impaired loans held-for-investment	$ 3,017	$ 3,539