Pledged Assets - Assets Pledged By Counterparties (Details) - Repurchase Agreement [Member] - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Pledged Assets [Line Items]
Mortgage Backed Securities Pledged From Counterparties	$ 300,000	$ 0
United States Treasury Securities Pledged By Counterparties	2,699,000	3,438,000
Cash Pledged By Counterparties	1,739,000	1,029,000
Total Assets Pledged By Counterparties	$ 4,738,000	$ 4,467,000