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Basis of Accounting and Consolidation - Additional Information (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2025
USD ($)
Segment
$ / shares
shares
Sep. 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 8,522 9,384 22,492 25,319  
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  
AAdvantage Insurance Group LLC | Customer List Intangibles          
Summary Of Significant Accounting Policies [Line Items]          
Purchase price | $ $ 2,800,000        
Mid Rivers Insurance Group, Inc          
Summary Of Significant Accounting Policies [Line Items]          
Purchase price | $   $ 10,100,000