Fair Value - Impaired Loans Held-for-investment - Tabular Disclosure (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Impaired Loans Held-for-investment
Impaired loans held-for-investment	$ 4,633	$ 6,527
Carried at fair value
Impaired Loans Held-for-investment
Impaired loans held-for-investment	2,499	2,988
Specific valuation allowance	(1,668)	(286)
Impaired loans held-for-investment carried at fair value, net	831	2,702
Portion carried at cost
Impaired Loans Held-for-investment
Impaired loans held-for-investment	$ 2,134	$ 3,539