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Derivative Instruments and Hedging Activities - Summary of Offsetting of Financial Assets and Derivative Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheet	$ 10,447	$ 10,864
Interest Rate Swaps
Offsetting Assets [Line Items]
Gross Amount of Recognized Assets	4,190	4,723
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheet	4,190	4,723
Gross amounts not offset in the consolidated balance sheet, Financial instruments	0	0
Gross amounts not offset in the consolidated balance sheet, Cash collateral received	1,900	0
Gross amounts not offset in the consolidated balance sheet, Net amount	$ 2,290	$ 4,723

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