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Derivative Financial Instruments and Hedging Activities - Offsetting of Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Interest rate swap | Other assets
Offsetting Assets [Line Items]
Accrued interest on derivative asset interest rate swaps	$ 1	$ 1
Counterparty A
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	436	74
Gross Amounts Offset in the Statements of Condition	0	0
Net Amounts of Assets Presented in the Statements of Condition	436	74
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments	(163)	(74)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Received	0	0
Net Amount	$ 273	$ 0

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