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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Jan. 01, 2023
Apr. 30, 2021
Significant Accounting Policies [Line Items]        
Stock issued during period, value, new issues $ 147,000 $ 133,000    
Stock repurchased during period, shares (in shares) 0      
Stock repurchased during period, value   $ 682,000    
Stock repurchase program, number of shares authorized to be repurchased (in shares)       375,388
Stock repurchase program, percent of stock outstanding       5.00%
Allowance for credit loss $ 0   $ 7,200,000  
Additional allowance for credit loss on unfunded commitments     3,300,000  
Number of days individually evaluation 60 days      
Other Assets [Member]        
Significant Accounting Policies [Line Items]        
Allowance for credit loss     1,500,000  
Additional allowance for credit loss on unfunded commitments     688,000  
Retained Earnings [Member]        
Significant Accounting Policies [Line Items]        
Allowance for credit loss     5,500,000  
Additional allowance for credit loss on unfunded commitments     $ 2,600,000  
Directors' Stock Purchase Plan [Member]        
Significant Accounting Policies [Line Items]        
Stock issued during period, shares, new issues (in shares) 3,220      
Stock issued during period, value, new issues $ 94,000      
Employee Stock Purchase Plan [Member]        
Significant Accounting Policies [Line Items]        
Stock issued during period, shares, new issues (in shares) 2,431      
Stock issued during period, value, new issues $ 53,000