Offsetting Assets and Liabilities - Offsetting of Assets (Details) - Swaption [Member} - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Offsetting Assets [Line Assets]
Gross Amount Of Recognized Assets	$ 0	$ 1,217,000
Gross Amount Of Assets Offset In The Balance Sheet	0	0
Net Amount Of Assets Presented In The Balance Sheet	0	1,217,000
Gross Amounts Of Financial Instruments Received Not Offset In Balance Sheet	0	0
Gross Amounts Of Cash Collateral Received Not Offset In Balance Sheet	0	(1,217,000)
Net Amount Of Assets	$ 0	$ 0