Derivatives and Hedging Activities - Tabular Disclosure Offsetting Derivatives (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross Amounts of Recognized Assets	$ 848	$ 627
Gross Amounts of Recognized Liabilities	0	0
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	848	627
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	0	0
Financial Instruments	0	0
Cash Collateral Received	0	0
Net Amount	$ 848	$ 627