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Derivative Instruments and Hedging Activities - Summary of Offsetting of Financial Assets and Derivative Assets (Detail) - Interest Rate Contract - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Offsetting Assets [Line Items]    
Gross Amounts Recognized on the Consolidated Balance Sheets $ 199 $ 432
Financial Instruments 0 0
Cash Collateral Received/(Posted) 0 0
Net Amount $ 199 $ 432