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Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Jun. 30, 2023
Jan. 01, 2023
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]              
Loans and Leases Receivable, Related Parties, Ending Balance $ 1,400,000 $ 200,000          
Loans and Leases Receivable, Related Parties, Additions   0          
Loans and Leases Receivable, Related Parties, Proceeds 0 100,000          
Transition adjustment increase in allowance for credit losses       $ 2,100,000      
Decrease to retained earnings 87,408,000 85,135,000 $ 85,725,000   $ 83,103,000 $ 82,576,000 $ 90,064,000
Minimum commitment required for evaluating idividually 500,000            
Commitment required for evaluating individually at management discretion 500,000            
Loans and leases, allowance for credit losses 11,380,000 9,422,000     9,373,000   8,320,000
Retained Earnings [Member]              
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]              
Decrease to retained earnings 107,976,000 104,460,000 $ 106,157,000   $ 102,523,000 $ 100,838,000 $ 98,428,000
Impact of Adopting CECL [Member]              
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]              
Transition adjustment increase in allowance for credit losses       2,400,000      
Decrease to retained earnings (1,811,000)            
Loans and leases, allowance for credit losses 2,123,000     2,100,000      
Additional increase to allowance for credit losses on loans and leases 500,000            
Impact of Adopting CECL [Member] | Retained Earnings [Member]              
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]              
Decrease to retained earnings (1,811,000)     1,800,000      
Reserve for Unfunded Commitments [Member]              
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]              
Transition adjustment increase in allowance for credit losses       300,000      
Loans and leases, allowance for credit losses $ 500,000 $ 0          
Reserve for Unfunded Commitments [Member] | Impact of Adopting CECL [Member]              
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]              
Loans and leases, allowance for credit losses       $ 300,000      
Real Estate [Member]              
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]              
Percentage of Loan Portfolio 52.70% 53.00%          
Pledged as Collateral [Member] | FHLB Borrowings [Member]              
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]              
Loans pledged as collateral $ 100,800,000 $ 100,200,000          
Pledged as Collateral [Member] | Federal Reserve Bank Advances [Member]              
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]              
Loans pledged as collateral $ 282,600,000 $ 0