Offsetting of Derivative Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Offsetting Derivative Assets [Abstract]
Gross Amounts of Recognized Assets Presented in the Consolidated Balance Sheets	$ 4,532	$ 2,900
Derivative Financial Instruments Not Offset in the Consolidated Balance Sheets	(128)	(90)
Cash Collateral Received Not Offset in the Consolidated Balance Sheets	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	$ 4,404	$ 2,810