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Basis of Accounting and Consolidation - Additional Information (Details)
 3 Months Ended
Mar. 31, 2025
USD ($)
Segment
$ / shares
shares
Sep. 30, 2024
USD ($)
Mar. 31, 2024
shares
Dec. 31, 2024
$ / shares
Summary Of Significant Accounting Policies [Line Items]        
Common stock, par value (in dollars per share) | $ / shares $ 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) 550,000      
Employee discount for employee stock purchase plan 15.00%      
Employee stock purchase plan, number of shares authorized 600,000      
Stock issued during period, shares, employee stock purchase plans 6,891   8,612  
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      
Change in Accounting Principle, Accounting Standards Update, Adoption Date 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) 46,000   39,150  
Mid Rivers Insurance Group, Inc        
Summary Of Significant Accounting Policies [Line Items]        
Purchase price | $   $ 10,100,000