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Derivative Financial Instruments and Hedging Activities - Offsetting of Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Interest rate swap | Other liabilities
Offsetting Liabilities [Line Items]
Accrued interest on derivative liability interest swaps	$ 3	$ 8
Counterparty A
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	163	740
Gross Amounts Offset in the Statements of Condition	0	0
Net Amounts of Liabilities Presented in the Statements of Condition	163	740
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments	(163)	(74)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Pledged		(666)
Net Amount	$ 0	$ 0

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