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Basis of Accounting and Consolidation - Additional Information (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
$ / shares
shares
Sep. 30, 2024
USD ($)
Jun. 30, 2024
shares
Jun. 30, 2025
USD ($)
Segment
$ / shares
shares
Jun. 30, 2024
shares
Dec. 31, 2024
$ / shares
Summary Of Significant Accounting Policies [Line Items]            
Common stock, par value (in dollars per share) | $ / shares $ 4     $ 4   $ 4
Number of operating segment | Segment       1    
Stock plans, term       10 years    
Maximum number of shares to be issued in stock incentive plan (in shares) 1,000,000     1,000,000    
Employee discount for employee stock purchase plan       15.00%    
Employee stock purchase plan, number of shares authorized 600,000     600,000    
Stock issued during period, shares, employee stock purchase plans 7,079   7,323 13,970 15,935  
Captive maximum gross premiums | $       $ 2,850,000    
ASU 2023-07            
Summary Of Significant Accounting Policies [Line Items]            
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true     true    
Change in Accounting Principle, Accounting Standards Update, Adoption Date Dec. 31, 2024     Dec. 31, 2024    
Employee Stock Option            
Summary Of Significant Accounting Policies [Line Items]            
Common stock awarded in SI plan (in shares)       0    
Restricted Stock            
Summary Of Significant Accounting Policies [Line Items]            
Common stock awarded in SI plan (in shares)       79,635 53,766  
Restricted Stock Units (RSUs)            
Summary Of Significant Accounting Policies [Line Items]            
Common stock awarded in SI plan (in shares)       53,130 39,150  
Mid Rivers Insurance Group, Inc            
Summary Of Significant Accounting Policies [Line Items]            
Purchase price | $   $ 10,100,000