Derivatives Offsetting (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheet	$ 4,997	$ 837
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	8	0
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Derivative [Line Items]
Gross Amounts of Recognized Assets	4,997	837
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	4,997	837
Financial Instruments	(8)	0
Cash Collateral Received	0	0
Net Amount	(4,989)	(837)
Gross Amounts of Recognized Liabilities	(8)	0
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	8	0
Financial Instruments	8	0
Cash Collateral Posted	0	0
Net Amount	$ 0	$ 0