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Allowance for Credit Losses - Loans - Additional information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Provision (Recovery) $ (293,000) $ 301,000  
Provision (recovery) for credit losses (557,000) 1,179,000  
Net loan charge-offs $ 121,000 $ 116,000  
Percentage of charge-offs 0.05% 0.05%  
Net unfavorable shift $ 594,000    
Percentage Of Allowance For Total Loans 1.43%   1.45%
Evaluated for impairment $ 150,000    
Percentage of coverage on non-performing assets 120.00%   121.00%
Percentage of general reserve 45.00%    
Percentage of quantitative reserve 55.00%    
Non-performing assets $ 11,959,000   $ 12,167,000
Current period gross charge-offs, Total 164,000 $ 139,000  
Non-performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total non-performing assets $ 12,161,000   12,393,000
Non-performing assets as a percent of loans 1.18%    
Other commercial real estate (non-owner occupied)      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Provision (Recovery) $ 1,186,000    
Non-performing assets 8,553,000   8,780,000
Other commercial real estate (non-owner occupied) | Non-performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total non-performing assets 8,553,000   8,780,000
Commercial real estate (non-owner occupied)      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Provision (Recovery)   (3,000)  
Other commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Provision (Recovery) (272,000) (36,000)  
Non-performing assets 1,678,000   1,694,000
Current period gross charge-offs, Total 103,000    
Other commercial and industrial | Non-performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total non-performing assets 1,865,000   1,905,000
Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Minimum individual loan balance requiring quarterly review 2,000,000    
Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Minimum individual loan balance requiring quarterly review 250,000    
Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Minimum individual loan balance requiring quarterly review 250,000    
Doubtful      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Minimum individual loan balance requiring quarterly review 100,000    
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current period gross charge-offs, Total 103,000   3,312,000
Commercial | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Minimum aggregate balances for commercial loan relationship under structure loan rating process. 1,000,000    
Commercial | Commercial real estate (non-owner occupied) - retail      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Provision (Recovery) $ 118,000 54,000  
Current period gross charge-offs, Total     2,028,000
Commercial | Other commercial real estate (non-owner occupied)      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current period gross charge-offs, Total     804,000
Commercial | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Minimum percent of portfolio to be reviewed 37.00%    
Commercial | Other commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current period gross charge-offs, Total $ 103,000   480,000
Consumer.      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current period gross charge-offs, Total 61,000   329,000
Consumer. | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Provision (Recovery) 43,000 428,000  
Non-performing assets 839,000   788,000
Current period gross charge-offs, Total 61,000 $ 139,000 275,000
Consumer. | Consumer | Non-performing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total non-performing assets $ 839,000   $ 788,000