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Investments (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
item
security
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Jan. 01, 2023
USD ($)
Investments        
Held to maturity securities, allowance for credit loss $ 30,000   $ 30,000  
Impairment reversal 0   (11,346)  
Allowance for credit losses on available-for-sale securities 0      
Provision for credit losses on held to maturity securities 0   (11,000)  
Held to maturity securities, net 133,665,000   150,941,000  
Held-to-maturity classified as nonaccrual 0   0  
Proceeds from sale of debt securities 0 $ 0    
Financial asset, 30 to 59 Days Past Due        
Investments        
Held to maturity securities, net 0   0  
U.S. Treasuries        
Investments        
Held to maturity securities, net $ 44,971,000   59,901,000  
Number of positions in unrealized loss | item 12      
Number of investments in securities | item 19      
Mortgage-backed securities        
Investments        
Number of positions in unrealized loss | item 39      
Number of investments in securities | item 46      
Collateralized mortgage obligations        
Investments        
Number of positions in unrealized loss | item 30      
Number of investments in securities | item 33      
States and political subdivisions        
Investments        
Held to maturity securities, allowance for credit loss $ 30,000   30,000  
Held to maturity securities, net $ 88,694,000   91,040,000  
Number of positions in unrealized loss | security 74      
Number of investments in securities | security 75      
Asset Pledged as Collateral | Public Deposits, Federal Funds Purchased and Other Balances Required by Law        
Investments        
Fair value of securities $ 328,161,363   $ 296,945,649  
Cumulative Effect, Period of Adoption, Adjusted Balance        
Investments        
Held to maturity securities, allowance for credit loss       $ 41,000