Derivative Financial Instruments - Schedule of Derivative Assets and Liabilties (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Assets, at Fair Value	$ 10,613,000	$ 10,365,000
Liabilities, at Fair Value	2,712,000	1,982,000
Restricted cash	19,865,000	20,950,000
Interest Rate Swaps [Member]
Assets, at Fair Value	8,523,000	10,302,000
Liabilities, at Fair Value	2,712,000	802,000
TBA Contracts [Member]
Assets, at Fair Value	2,090,000	63,000
Liabilities, at Fair Value	0	1,180,000
Restricted cash	257,000	446,000
Eurodollar Future Margin [Member]
Restricted cash	10,021,000	9,419,000
Interest Rate Swaption Margin [Member]
Restricted cash	$ 3,047,000	$ 0