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Derivatives and Hedging Activities - Summary of Fair Value of Derivative Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Derivative Assets, Fair Value $ 68,701 $ 103,554
Derivative Liabilities, Fair Value 13,860 9,375
Derivatives not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Fair Value 68,700 103,506
Derivative Liabilities, Fair Value 12,392 9,375
Derivatives Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Fair Value 1 $ 48
Derivative Liabilities, Fair Value $ 1,468