Fair Value - Impaired Loans Held-for-investment - Tabular Disclosure (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Impaired Loans Held-for-investment
Impaired loans held-for-investment	$ 10,264,000	$ 15,140,000
Carried at fair value
Impaired Loans Held-for-investment
Impaired loans held-for-investment	2,697,000	7,646,000
Specific valuation allowance	(1,835,000)	(6,944,000)
Impaired loans held-for-investment carried at fair value, net	862,000	702,000
Portion carried at cost
Impaired Loans Held-for-investment
Impaired loans held-for-investment	$ 7,567,000	$ 7,494,000