Derivative Instruments and Hedging Activities - Summary of Gross and Net Amounts of Derivative Financial Instruments (Detail) - Interest Rate Swap - Cash Flow Hedges - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional Amount of Cash Flow Hedges	$ 7,648	$ 8,037
Gross Amounts of Recognized Liabilities	(416)	(618)
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Balance Sheet	(416)	(618)
Gross Amounts Not Offset in the Balance Sheet, Financial Instruments	(416)	(618)
Gross Amounts Not Offset in the Balance Sheet, Cash Collateral	0	0
Net Amount	$ (416)	$ (618)

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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