Offsetting Assets and Liabilities - Offsetting of Assets (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Receiver Swaption [Member]
Offsetting Assets [Line Assets]
Gross Amount Of Recognized Assets	$ 669,000
Gross Amount Of Assets Offset In The Balance Sheet	0
Net Amount Of Assets Presented In The Balance Sheet	669,000
Gross Amounts Of Financial Instruments Received Not Offset In Balance Sheet	(669,000)
Gross Amounts Of Cash Collateral Received Not Offset In Balance Sheet	0
Net Amount Of Assets	$ 0
Payer Swaption [Member]
Offsetting Assets [Line Assets]
Gross Amount Of Recognized Assets		$ 1,217,000
Gross Amount Of Assets Offset In The Balance Sheet		0
Net Amount Of Assets Presented In The Balance Sheet		1,217,000
Gross Amounts Of Financial Instruments Received Not Offset In Balance Sheet		0
Gross Amounts Of Cash Collateral Received Not Offset In Balance Sheet		(1,217,000)
Net Amount Of Assets		$ 0