Quarterly report pursuant to Section 13 or 15(d)

Derivatives and Hedging Activities - Schedule of Fair Value of Derivative Financial Instruments as well as their Location on Balance Sheet (Detail)

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Derivatives and Hedging Activities - Schedule of Fair Value of Derivative Financial Instruments as well as their Location on Balance Sheet (Detail) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Derivatives Fair Value [Line Items]    
Total derivative assets $ 800,000 $ 1,088,000
Total derivative liabilities 769,000 1,149,000
Not Designated as Hedging Instrument | Interest Rate Products    
Derivatives Fair Value [Line Items]    
Notional Amount 66,466,000 66,904,000
Total derivative assets 800,000 1,088,000
Total derivative liabilities $ 769,000 $ 1,149,000