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Derivative Financial Instruments and Hedging Activities - Offsetting of Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Interest rate swap | Other assets
Offsetting Assets [Line Items]
Accrued interest on derivative asset interest rate swaps	$ 2	$ 1
Counterparty A
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	239	74
Gross Amounts Offset in the Statements of Condition	0	0
Net Amounts of Assets Presented in the Statements of Condition	239	74
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments	(239)	(74)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Received	0	0
Net Amount	$ 0	$ 0

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Derivative Asset, Accrued Interest, Interest Rate Swaps

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