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Summary of Significant Accounting Policies (Details)
 12 Months Ended
Oct. 01, 2024
USD ($)
Dec. 31, 2024
USD ($)
item
subsidiary
segment
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Summary of Significant Accounting Policies        
Number of insurance-related subsidiaries | item   1    
Investment Securities        
Number of components in which other-than-temporary impairment is segregated | item   2    
Non-Accrual Loans        
Period of charge off for past due unsecured consumer loans   90 days    
Minimum period that past due unsecured loans outstanding may not be placed on nonaccrual status under special circumstances   90 days    
Maximum period of non-consumer loans outstanding that is used to evaluate whether loans should be placed on non-accrual status   90 days    
Other Real Estate Owned and Repossessed Assets        
Other real estate owned   $ 28,193,000 $ 26,728,000  
Repossessed assets   $ 358,000 236,000  
Other Investments        
Equity Method Investments, Recording Arrear   3 months    
Income Taxes        
Percentage of likelihood of realization of recognized tax benefit   50.00%    
Liability for unrecognized tax benefits   $ 0 0  
Interest expense related to uncertain tax positions   0 0 $ 0
Penalties related to uncertain tax positions   0 0 $ 0
Goodwill and Identified Intangible Assets        
Changes in carrying amount of goodwill   $ 0 $ 0  
Goodwill impairment loss $ 0      
Segments of an Enterprise and Related Information        
Number of operating segments | segment   1    
Number of active operating bank subsidiaries | subsidiary   5