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Stock-Based Compensation Plan - Summary of Nonvested Restricted Shares (Details) - Restricted Stock - $ / shares
 9 Months Ended
Sep. 30, 2025
Sep. 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) 2,460 3,950
Forfeited, number of shares (in shares) 0  
Nonvested at end of year, number of shares (in shares) 6,240  
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) 58.05  
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) $ 34.19