Derivative Financial Instruments - Summary of TBA Contracts (USD $)	Mar. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Assets, at Fair Value	$ 6,296,000	$ 6,391,000
Long Member
Derivatives, Fair Value [Line Items]
Notional Amount	75,000,000
Cost Basis	81,722,000
Market Value Of TBA Contract	81,730,000
Assets, at Fair Value	8,000
Short Member [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	(75,000,000)
Cost Basis	(81,930,000)
Market Value Of TBA Contract	(81,950,000)
Assets, at Fair Value	(20,000)
Unsettled Offsetting Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	0
Cost Basis	0
Market Value Of TBA Contract	104,000
Assets, at Fair Value	$ 104,000