Stockholders' Equity (Details) (USD $)	3 Months Ended			12 Months Ended							1 Months Ended		0 Months Ended		1 Months Ended		0 Months Ended	1 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2012	Jan. 31, 2013	Dec. 19, 2012	Nov. 29, 2012	Oct. 22, 2012	Jun. 05, 2012	May 01, 2012	Dec. 31, 2012 ZAIS Financial Partners, L.P. [Member]	Oct. 31, 2012 ZAIS Financial Partners, L.P. [Member]	Feb. 13, 2013 ZAIS Group, LLC [Member]	Feb. 13, 2013 Common Stock [Member]	Dec. 31, 2012 Common Stock [Member]	Oct. 31, 2012 Common Stock [Member]	Feb. 15, 2013 Preferred Stock [Member]	Jan. 18, 2012 Preferred Stock [Member]
Stockholders' Equity [Abstract]
Common stock, shares outstanding	7,970,886	2,071,096		2,071,096
Class of Stock [Line Items]
Shares of stock issued														5,650,000	36,581	195,458		133
Common stock issued, price per share														$ 21.25
Gross proceeds from issuance initial public offering														$ 120,100,000
Value of stock issued	118,862,500			4,757,470										118,900,000				115,499
Value of OP units and common stock issued		25,151,174
Offering fees		763,000											6,300,000	1,200,000				17,501
Common stock repurchase liability, common shares		515,035		515,035	265,245
Common stock repurchase liability		11,190,687		11,190,687	5,800,000
Other liabilities	700,000
Payments for common stock repurchased	5,158,750
Number of shares repurchased																	133
Payments for Repurchase of Preferred Stock and Preference Stock	$ 148,379																$ 148,379
Limited Partners' Capital Account [Line Items]
Issuance of OP units											904,422	22,492
Dividend declared, amount per share						$ 1.16	$ 0.98	$ 0.89	$ 0.57	$ 0.51