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Employee Benefit Plans, Restricted Stock Plan (Details) - Restricted Stock [Member] - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Deferred Compensation Arrangements [Abstract]        
Number of shares authorized (in shares) 150,000   150,000  
Number of shares available for grant (in shares) 113,816   113,816  
Unvested Shares [Roll Forward]        
Outstanding, beginning of period (in shares) 6,372   6,622  
Granted (in shares) 2,242   2,242  
Forfeited (in shares) 0   (161)  
Vested (in shares) (2,360)   (2,449)  
Outstanding, end of period (in shares) 6,254   6,254  
Weighted Average Market Price [Roll Forward]        
Outstanding, beginning of period (in dollars per share) $ 63.71   $ 63.63  
Granted (in dollars per share) 83.38   83.38  
Forfeited (in dollars per share) 0   (63.13)  
Vested (in dollars per share) (61.47)   (61.38)  
Outstanding, end of period (in dollars per share) $ 71.61   $ 71.61  
Additional General Disclosures [Abstract]        
Share-based compensation expense $ 51,000 $ 65,000 $ 116,000 $ 142,000
Compensation cost related to nonvested awards that has not yet been recognized $ 448,000   $ 448,000  
Period over which compensation cost is expected to be recognized     3 years