Stockholders' Equity (Details) - USD ($)											12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Sep. 08, 2016	Aug. 11, 2016	Jun. 30, 2016	May 11, 2016	Apr. 15, 2016	Sep. 25, 2013	Nov. 21, 2008	Nov. 15, 2008	Dec. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
U.S. Treasury sales of shares to outside investors (in shares)								23,393,000
Preferred stock, par value (in dollars per share)	$ 0.01										$ 0.01	$ 0.01
Common stock, par value (in dollars per share)	0.01										$ 0.01	$ 0.01
Series B Warrant [Member]
Class of Stock [Line Items]
Term of warrant											10 years
Exercise price of warrants (in dollars per share)	$ 6.30										$ 6.30
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	437,500									437,500	437,500	437,500
Preferred stock dividend rate percentage											8.00%
Preferred stock liquidation preference (in dollars per share)	$ 8.00										$ 8.00
Number of shares issued upon conversion (in shares)	1										1
Share conversion price (in dollars per share)	$ 8.00										$ 8.00
Stock issuance cost										$ 247,000
Dividends declared and paid	$ 70,000	$ 70,000			$ 70,000						$ 210,000
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	0								23,393		0	23,393
Preferred stock dividend rate percentage											9.00%
Preferred stock liquidation preference (in dollars per share)									$ 1,000
Stock issuance cost									$ 45,000
Dividends declared and paid			$ 77,000	$ 301,000		$ 326,000	$ 7,590,000				$ 1,231,000	$ 2,105,000
Preferred stock, par value (in dollars per share)									$ 0.01
Common stock purchase rights with issue of a warrant (in shares)									556,976
Aggregate purchase price, Preferred Stock and Warrants									$ 23,393,000
Common stock, par value (in dollars per share)									$ 0.01
Shares redeemed (in shares)			(13,393)			(10,000)
Value of stock redeemed			$ 13,393,000			$ 10,000,000