Condensed Balance Sheets (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Preferred stock, par value (in Dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in Shares)	25,000,000	25,000,000
Preferred stock, shares issued (in Shares)	0	0
Preferred stock, shares outstanding (in Shares)	0	0
Common Stock, par value (in Dollars per share)	$ 0.001	$ 0.001
Common Stock, shares authorized (in Shares)	250,000,000	250,000,000
Common Stock, shares issued (in Shares)	7,500,000	7,500,000
Common Stock, shares outstanding (in Shares)	7,500,050	7,500,000
US Government Agencies Debt Securities [Member]
Plеdgеd assеts (in Dollars)	$ 1,059,756	$ 1,087,452
Non-Agency Securities [Member]
Plеdgеd assеts (in Dollars)	$ 136,752	$ 129,946