Offsetting Assets and Liabilities - Offsetting of Assets (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Offsetting Assets [Line Assets]
Gross Amount Of Recognized Assets	$ 1,217,000	$ 0
Gross Amount Of Assets Offset In The Balance Sheet	0	0
Net Amount Of Assets Presented In The Balance Sheet	1,217,000	0
Gross Amounts Of Financial Instruments Received Not Offset In Balance Sheet	0	0
Gross Amounts Of Cash Collateral Received Not Offset In Balance Sheet	(1,217,000)	0
Net Amount Of Assets	0	0
Swaption [Member}
Offsetting Assets [Line Assets]
Gross Amount Of Recognized Assets	1,217,000	0
Gross Amount Of Assets Offset In The Balance Sheet	0	0
Net Amount Of Assets Presented In The Balance Sheet	1,217,000	0
Gross Amounts Of Financial Instruments Received Not Offset In Balance Sheet	0	0
Gross Amounts Of Cash Collateral Received Not Offset In Balance Sheet	(1,217,000)	0
Net Amount Of Assets	$ 0	$ 0