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Derivatives and Hedging Activities - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jan. 17, 2023
USD ($)
Jun. 30, 2023
USD ($)
Derivative
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Derivative
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Derivatives Fair Value [Line Items]            
Interest rate swaps       $ (961,000) $ 544,000  
Cash collateral from counterparties   $ 0   0   $ 535,000
Cash in collateral returned   6,643,000   6,643,000   8,250,000
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities)   (278,000)   (278,000)    
Derivatives liability   0   0   0
Interest Rate Swap 2021 [Member]            
Derivatives Fair Value [Line Items]            
Gain on derivative $ 849,000          
Cash in collateral returned $ 536,000          
Balance Sheet Hedges on 90-day Advances from FHLB [Member]            
Derivatives Fair Value [Line Items]            
Liabilities   10,000,000   10,000,000    
Interest Rate Swap Contracts and Customer Loan Swaps [Member]            
Derivatives Fair Value [Line Items]            
Cash collateral from counterparties   778,000   778,000   535,000
Designated as Hedging Instrument [Member]            
Derivatives Fair Value [Line Items]            
Designated hedged items   25,000,000   25,000,000    
Derivative assets, notional amount   25,000,000   25,000,000    
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]            
Derivatives Fair Value [Line Items]            
Notional amount           10,000,000
Interest rate swaps   $ 0 $ 108,000 $ (112,000) $ 545,000  
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Assets [Member]            
Derivatives Fair Value [Line Items]            
Interest rate swap derivative asset           961,000
Designated as Hedging Instrument [Member] | Interest Rate Swap 2021 [Member]            
Derivatives Fair Value [Line Items]            
Notional amount           5,000,000
Cash Flow Hedges on 90-day Advances from FHLB [Member]            
Derivatives Fair Value [Line Items]            
Liabilities           10,000,000
Cash Flow Hedges on 90-day Advances from FHLB [Member] | Interest Rate Swap [Member]            
Derivatives Fair Value [Line Items]            
Number of notional interest rate swaps | Derivative   2   2    
Cash Flow Hedges on 90-day Advances from FHLB [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap 2021 [Member]            
Derivatives Fair Value [Line Items]            
Notional amount   $ 5,000,000   $ 5,000,000    
Fair Value Hedging [Member]            
Derivatives Fair Value [Line Items]            
Fair Value Hedges           $ 0
Remaining maturity   2 years 11 months 1 day   2 years 11 months 1 day    
Average fixed interest rate   3.99%   3.99%    
Fixed annual rate   5.06%   5.06%    
Fair Value Hedging [Member] | Fixed Rate Assets [Member]            
Derivatives Fair Value [Line Items]            
Amortized cost basis of the closed portfolios used in hedging relationships   $ 63,700,000   $ 63,700,000    
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities)   $ (278,000)   $ (278,000)