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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

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