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Stock-Based Compensation Plan - Summary of Nonvested Restricted Shares (Details) - Restricted Stock - $ / shares
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Stock-Based Compensation Plan.    
Nonvested at beginning of year, number of shares (in shares) 4,800  
Granted, number of shares (in shares) 3,900  
Vested, number of shares (in shares) 0 825
Forfeited, number of shares (in shares) 0  
Nonvested at end of year, number of shares (in shares) 8,700  
Nonvested at beginning of year, weighted average grant date fair value (in dollars per share) $ 43.4  
Granted, weighted average grant date fair value (in dollars per share) 37.9  
Vested, weighted average grant date fair value (in dollars per share) 0  
Forfeited, weighted average grant date fair value (in dollars per share) 0  
Nonvested at end of year, weighted average grant date fair value (in dollars per share) $ 40.93